MFS VARIABLE INSURANCE TRUST
497, 1996-05-03
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<PAGE>
 
<TABLE>
<S>                                            <C>
MFS-REGISTERED TRADEMARK- TOTAL RETURN
SERIES-SM-
MFS-REGISTERED TRADEMARK- UTILITIES
SERIES-SM-
MFS-REGISTERED TRADEMARK- WORLD GOVERNMENTS            PROSPECTUS
SERIES-SM-                                            May 1, 1996
</TABLE>
 
- --------------------------------------------------------------------------------
MFS-Registered Trademark- VARIABLE INSURANCE TRUST-SM-
500 Boylston Street, Boston, Massachusetts 02116                  (617) 954-5000
 
MFS  Variable Insurance Trust (the "Trust") is an open-end management investment
company offering insurance company separate  accounts a selection of  investment
vehicles  for  variable  annuity  and  variable  life  insurance  contracts (the
"Contracts"). The Trust has twelve separate portfolios or series, three of which
are offered pursuant to this Prospectus:
 
- -- MFS TOTAL RETURN SERIES (the "Total Return Series"), which seeks primarily to
   provide above-average income  (compared to a  portfolio invested entirely  in
   equity  securities)  consistent with  the prudent  employment of  capital and
   secondarily to provide  a reasonable  opportunity for growth  of capital  and
   income;
 
- -- MFS UTILITIES SERIES (the "Utilities Series"), which seeks capital growth and
   current  income  (income  above  that  available  from  a  portfolio invested
   entirely in equity securities); and
 
- -- MFS WORLD GOVERNMENTS  SERIES (the "World  Governments Series"), which  seeks
   not  only preservation,  but also growth  of capital,  together with moderate
   current income.
                              -------------------
 
The investment adviser  and distributor  of the Total  Return Series,  Utilities
Series  and World Governments Series (collectively  hereinafter referred to as a
"Series" or the "Series") are  Massachusetts Financial Services Company and  MFS
Fund Distributors, Inc., respectively, both of which are located at 500 Boylston
Street, Boston, Massachusetts 02116.
 
BECAUSE   OF  THEIR   INVESTMENT  POLICIES  PERMITTING   INVESTMENT  IN  FOREIGN
SECURITIES, INVESTMENTS IN  EACH SERIES MAY  BE SUBJECT TO  A GREATER DEGREE  OF
RISK  THAN INVESTMENTS  IN OTHER INVESTMENT  COMPANIES WHICH  INVEST ENTIRELY IN
DOMESTIC SECURITIES.
                              -------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE COMMISSION  OR ANY  STATE SECURITIES  COMMISSION NOR  HAS  THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       PASSED  UPON  THE ACCURACY  OR ADEQUACY  OF THIS  PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------
 
SHARES OF THE TRUST  ARE AVAILABLE AND  ARE BEING MARKETED  AS A POOLED  FUNDING
VEHICLE FOR LIFE INSURANCE COMPANIES WRITING ALL TYPES OF CONTRACTS.
 
This  Prospectus sets forth  concisely the information about  each Series that a
prospective investor should know  before applying for  the Contracts offered  by
the  separate accounts of certain  insurance companies ("Participating Insurance
Companies"). Investors are advised  to read this  Prospectus and the  applicable
Contract  prospectus  carefully and  retain them  for  future reference.  If you
require more detailed information, a Statement of Additional Information ("SAI")
dated May 1, 1996, as  amended or supplemented from  time to time, is  available
upon  request without charge and may be obtained by calling or by writing to the
Shareholder Servicing Agent (see back cover  for address and phone number).  The
SAI,  which is  incorporated by reference  into this Prospectus,  has been filed
with the Securities and Exchange Commission (the "SEC").
 
   INVESTORS SHOULD READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE REFERENCE.
<PAGE>
TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                           PAGE
                                                                                                                        -----------
<C>        <S>                                                                                                          <C>
       1.  Expense Summary............................................................................................           3
       2.  Investment Concept of the Trust............................................................................           3
       3.  Condensed Financial Information............................................................................           5
       4.  Investment Objectives and Policies.........................................................................           8
           MFS Total Return Series....................................................................................           8
           MFS Utilities Series.......................................................................................           9
           MFS World Governments Series...............................................................................          10
       5.  Investment Techniques......................................................................................          11
       6.  Additional Risk Factors....................................................................................          18
       7.  Management of the Series...................................................................................          21
       8.  Information Concerning Shares of Each Series...............................................................          23
           Purchases and Redemptions..................................................................................          23
           Net Asset Value............................................................................................          24
           Distributions..............................................................................................          24
           Tax Status.................................................................................................          24
           Description of Shares, Voting Rights and Liabilities.......................................................          24
           Performance Information....................................................................................          25
           Expenses...................................................................................................          25
           Shareholder Communications.................................................................................          26
Appendix A -- Description of Bond Ratings.............................................................................         A-1
Appendix B -- Principal Sectors of Utilities Industry.................................................................         B-1
</TABLE>
 
                                       2
<PAGE>
1.  EXPENSE SUMMARY
 
<TABLE>
<CAPTION>
ANNUAL OPERATING EXPENSES OF EACH SERIES (AS PERCENTAGE OF AVERAGE
 NET ASSETS):
 
                                                                        MFS
                                                                       TOTAL        MFS       MFS WORLD
                                                                      RETURN     UTILITIES   GOVERNMENTS
                                                                      SERIES      SERIES       SERIES
                                                                     ---------   ---------   -----------
   Management Fee..................................................    0.75%       0.75%        0.75%
<S>                                                                  <C>         <C>         <C>
    Other Expenses (after fee reduction)(3)........................    0.25%(1)    0.25%(1)     0.25%(2)
                                                                        ---         ---          ---
    Total Operating Expenses (after fee reduction).................    1.00%(1)    1.00%(1)     1.00%(2)
<FN>
- ------------
 1  The Adviser has agreed to bear,  subject to reimbursement, expenses for each
   of the  Total Return  Series and  Utilities Series,  such that  each  Series'
   aggregate  operating expense shall not exceed,  on an annualized basis, 1.00%
   of the average daily net assets of  the Series from November 2, 1994  through
   December  31, 1996, 1.25% of the average  daily net assets of the Series from
   January 1, 1997 through December 31, 1998, and 1.50% of the average daily net
   assets of the Series from January 1, 1999 through December 31, 2004; provided
   however, that this obligation may be  terminated or revised at any time.  See
   "Information  Concerning Shares of Each  Series--Expenses" below. Absent this
   expense arrangement, "Other Expenses" and "Total Operating Expenses" would be
   2.02% and 2.77%,  respectively, for the  Total Return Series,  and 2.33%  and
   3.08%, respectively, for the Utilities Series.
2  The Adviser has agreed to bear,  subject to reimbursement, until December 31,
  2004, expenses of the World Governments Series such that the Series' aggregate
  operating expenses do not exceed 1.00%, on an annualized basis, of its average
  daily net assets. See "Information Concerning Shares of Each Series--Expenses"
  below. Absent this expense arrangement, "Other Expenses" and "Total  Operating
  Expenses"  for  the  World  Governments  Series  would  be  1.24%  and  1.99%,
  respectively.
3 Each  Series has  an  expense offset  arrangement  which reduces  the  Series'
  custodian  fee based upon the amount of cash maintained by the Series with its
  custodian and  dividend  disbursing  agent,  and may  enter  into  other  such
  arrangements  and directed brokerage  arrangements (which would  also have the
  effect of reducing  the Series'  expenses). Any  such fee  reductions are  not
  reflected under "Other Expenses."
</TABLE>
 
The  purpose of the expense table above  is to assist investors in understanding
the various  costs and  expenses that  a  shareholder of  the Series  will  bear
directly  or indirectly.  The Series' annual  operating expenses  do not reflect
expenses imposed  by  separate  accounts of  Participating  Insurance  Companies
through  which an investment in  a Series is made  or their related Contracts. A
separate account's expenses are  disclosed in the  prospectus through which  the
Contract relating to that separate account is offered for sale.
 
2.  INVESTMENT CONCEPT OF THE TRUST
 
The  Trust is an open-end, registered  management investment company with twelve
separate series, each of which is a segregated, separately managed portfolio  of
securities. The Total Return Series is a diversified series of the Trust and the
World  Governments Series and the Utilities Series are non-diversified series of
the Trust. The Trust  was organized as  a business trust under  the laws of  The
Commonwealth of Massachusetts by a Declaration of Trust dated February 1, 1994.
 
The  Trust  offers shares  of its  twelve Series  to insurance  company separate
accounts that fund Contracts. Separate accounts may purchase or redeem shares at
net asset value without any sales or redemption charge. Fees and charges imposed
by a separate account, however, will affect the actual return to the holder of a
Contract. A separate account may also impose certain restrictions or limitations
on the  allocation  of  purchase  payments or  Contract  value  to  the  Series.
Prospective  investors  should consult  the  applicable Contract  prospectus for
information regarding fees and expenses of the Contract and separate account and
any applicable restrictions or limitations. The Trust assumes no  responsibility
for such prospectuses.
 
The  Trust offers shares of the Series to the separate accounts of Participating
Insurance Companies that are affiliated or unaffiliated ("shared funding"),  and
shares  of the Series will serve as the underlying investments for both variable
annuity  and  variable  life  insurance  contracts  ("mixed  funding").  Due  to
differences  in tax treatment or other  considerations, the interests of various
Contract owners might at some time be in conflict. The Trust currently does  not
foresee  any such conflict. Nevertheless, the  Trust's Board of Trustees intends
to monitor events  in order  to identify any  material irreconcilable  conflicts
 
                                       3
<PAGE>
which  may possibly arise and to determine  what action, if any, should be taken
in response thereto.  If such a  conflict were  to occur, one  or more  separate
accounts  of the Participating Insurance Companies might be required to withdraw
its investments  in one  or  more Series.  This might  force  a Series  to  sell
securities at disadvantageous prices.
 
Individual Contract holders are not the "shareholders" of the Trust. Rather, the
Participating   Insurance  Companies   and  their  separate   accounts  are  the
shareholders or  investors,  although such  companies  may pass  through  voting
rights to their Contract holders.
 
The Trust's Board of Trustees provides broad supervision over the affairs of the
Trust  and  the Series.  Massachusetts  Financial Services  Company,  a Delaware
corporation ("MFS" or the "Adviser"), is the investment adviser to each  Series.
A majority of the Trustees of the Trust are not affiliated with the Adviser. The
Adviser  is responsible for the management of  the assets of each Series and the
officers of the Trust  are responsible for the  operations. The Adviser  manages
the  Series'  portfolios  from day  to  day  in accordance  with  the investment
objectives and policies of each Series. The selection of investments and the way
they are managed  depend on the  conditions and  trends in the  economy and  the
financial marketplaces.
 
                                       4
<PAGE>
3.  CONDENSED FINANCIAL INFORMATION
 
The  following financial information has been  audited since the commencement of
investment operations of each Series and should be read in conjunction with  the
financial  statements included  in the  Series' Annual  Reports to shareholders.
These financial  statements  are  incorporated  by reference  into  the  SAI  in
reliance  upon the report  of the Series' independent  auditors given upon their
authority,  as  experts  in  accounting   and  auditing.  The  Series'   current
independent auditors are Deloitte & Touche LLP.
 
                              TOTAL RETURN SERIES
 
<TABLE>
<CAPTION>
                                                                      PERIOD ENDED
                                                                   DECEMBER 31, 1995*
                                                                   ------------------
<S>                                                                <C>
Per share data (for a share outstanding throughout the period):
Net asset value--beginning of period.............................        $10.00
                                                                         ------
Income from investment operations#--
  Net investment incomeSection...................................        $ 0.41
  Net realized and unrealized gain on investments and foreign
    currency transactions........................................          2.32
                                                                         ------
    Total from investment operations.............................        $ 2.73
                                                                         ------
Less distributions declared to shareholders--
  From net investment income.....................................        $(0.25)
  From net realized gain on investments and foreign currency
    transactions.................................................         (0.23)
                                                                         ------
    Total distributions declared to shareholders.................        $(0.48)
                                                                         ------
Net asset value--end of period...................................        $12.25
                                                                         ------
                                                                         ------
Total return.....................................................         27.34%++
Ratios (to average net assets)/Supplemental dataSection:
  Expenses.......................................................          1.00%+
  Net investment income..........................................          3.83%+
Portfolio turnover...............................................            16%
Net assets at end of period (000 omitted)........................        $2,797
<FN>
- --------------
        *  For the period from the commencement of investment operations, January 3, 1995 to December 31, 1995.
        +  Annualized.
       ++  Not annualized.
        #  Per share data is based on average shares outstanding.
  Section  The  Adviser voluntarily agreed to maintain the expenses of the  Series at not more than 1.00% of average daily net
           assets. To the extent  actual expenses were  over these limitations, the  net investment income  per share and  the
           ratios would have been:
 
Net investment income.......................................          $0.22
Ratios (to average net assets):
  Expenses..................................................         2.77%+
  Net investment income.....................................         2.09%+
</TABLE>
 
                                       5
<PAGE>
                                UTILITIES SERIES
 
<TABLE>
<CAPTION>
                                                                      PERIOD ENDED
                                                                   DECEMBER 31, 1995*
                                                                   ------------------
<S>                                                                <C>
Per share data (for a share outstanding throughout the period):
Net asset value--beginning of period.............................        $10.00
                                                                         ------
Income from investment operations#--
  Net investment incomeSection...................................        $ 0.39
  Net realized and unrealized gain on investments and foreign
    currency transactions........................................          3.00
                                                                         ------
    Total from investment operations.............................        $ 3.39
                                                                         ------
Less distributions declared to shareholders--
  From net investment income.....................................        $(0.24)
  From net realized gain on investments and foreign currency
    transactions.................................................         (0.58)
                                                                         ------
    Total distributions declared to shareholders.................        $(0.82)
                                                                         ------
Net asset value--end of period...................................        $12.57
                                                                         ------
                                                                         ------
Total return.....................................................         33.94%++
Ratios (to average net assets)/Supplemental dataSection:
  Expenses.......................................................          1.00%+
  Net investment income..........................................          3.66%+
Portfolio turnover...............................................            94%
Net assets at end of period (000 omitted)........................        $2,373
<FN>
- --------------
        *  For the period from the commencement of investment operations, January 3, 1995 to December 31, 1995.
        +  Annualized.
       ++  Not annualized.
        #  Per share data is based on average shares outstanding.
  Section  The  Adviser voluntarily agreed to maintain the expenses of the  Series at not more than 1.00% of average daily net
           assets. To the extent  actual expenses were  over these limitations, the  net investment income  per share and  the
           ratios would have been:
 
Net investment income.......................................          $0.17
Ratios (to average net assets):
  Expenses..................................................         3.08%+
  Net investment income.....................................         1.62%+
</TABLE>
 
                                       6
<PAGE>
                            WORLD GOVERNMENTS SERIES
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED          PERIOD ENDED
                                                                   DECEMBER 31, 1995    DECEMBER 31, 1994*
                                                                   ------------------   ------------------
<S>                                                                <C>                  <C>
Per share data (for a share outstanding throughout each period):
Net asset value--beginning of period.............................        $ 9.82               $10.00
                                                                         ------               ------
Income from investment operations#--
  Net investment incomeSection...................................        $ 0.63               $ 0.17
  Net realized and unrealized gain (loss) on investments and
    foreign currency transactions................................          0.78                (0.09)
                                                                         ------               ------
    Total from investment operations.............................        $ 1.41               $ 0.08
                                                                         ------               ------
Less distributions declared to shareholders--
  From net investment income.....................................        $(0.42)              $(0.17)
  In excess of net investment income.............................         (0.54)               (0.09)
  Tax return of capital..........................................         (0.10)                  --
                                                                         ------               ------
    Total distributions declared to shareholders.................        $(1.06)              $(0.26)
                                                                         ------               ------
Net asset value--end of period...................................        $10.17               $ 9.82
                                                                         ------               ------
                                                                         ------               ------
Total return.....................................................         14.38%                0.79%++
Ratios (to average net assets)/Supplemental dataSection:
  Expenses##.....................................................          1.00%                1.00%+
  Net investment income..........................................          6.05%                4.68%+
Portfolio turnover...............................................           211%                  62%
Net assets at end of period (000 omitted)........................        $7,424               $2,881
<FN>
- --------------
        *  For the period from the commencement of investment operations, June 14, 1994 to December 31, 1994.
        +  Annualized.
       ++  Not annualized.
        #  Per share data is based on average shares outstanding.
       ##  For fiscal years after September 1, 1995, the Series' expenses are calculated without reduction for fees paid
           indirectly.
  Section  The  Adviser voluntarily agreed to maintain the expenses of the Series at not more than 1.00% of average daily net
           assets. To the extent actual  expenses were over these  limitations, the net investment  income per share and  the
           ratios would have been:
 
Net investment income.......................................          $0.53              $0.16
Ratios (to average net assets):
  Expenses..................................................           1.99     %           1.10     %+
  Net investment income.....................................         5.09%                4.58%+
</TABLE>
 
Total  return information does  not reflect expenses that  apply to the separate
accounts of Participating  Insurance Companies or  their related Contracts.  The
inclusion  of these charges would reduce the  total return figure for the period
shown.
 
                                       7
<PAGE>
4.  INVESTMENT OBJECTIVES AND POLICIES
 
Each Series  has  different  investment  objectives  which  it  pursues  through
separate  investment policies, as described below. The differences in objectives
and policies among the Series can be expected to affect the degree of market and
financial risk to which each  Series is subject and  the return of each  Series.
The  investment objectives  and policies  of each  Series may,  unless otherwise
specifically stated, be changed by the Board of Trustees of the Trust without  a
vote of the shareholders. Any investment involves risk and there is no assurance
that the objectives of any Series will be achieved.
 
In  addition to the  specific investment practices  described below, each Series
may also engage in certain investment techniques as described under the  caption
"Investment  Techniques"  below and  in the  SAI  under the  caption "Investment
Techniques." The Series' investments are subject to certain risks, as  described
in  the above-referenced sections of the Prospectus and the SAI and as described
below under the caption "Additional Risk Factors."
 
MFS TOTAL RETURN SERIES -- The Total Return Series' primary investment objective
is to provide above-average income (compared to a portfolio invested entirely in
equity securities) consistent with  the prudent employment  of capital, and  its
secondary objective is to provide a reasonable opportunity for growth of capital
and  income, since many securities offering a better than average yield may also
possess growth potential. Thus, in  selecting securities for its portfolio,  the
Series  considers each of  these objectives. Under  normal market conditions, at
least 25% of the Total  Return Series' assets will  be invested in fixed  income
securities,  and at least 40% and no more than 75% of the Series' assets will be
invested in equity securities.
 
The Total Return  Series' policy is  to invest  in a broad  list of  securities,
including  short-term  obligations.  The list  may  be diversified  not  only by
companies and industries, but also by type of security. Fixed income  securities
and  equity securities (which  include: common and  preferred stocks; securities
such as  bonds,  warrants  or  rights  that  are  convertible  into  stock;  and
depository  receipts for those securities) may be held by the Series. Some fixed
income securities may also have a call on common stock by means of a  conversion
privilege  or attached warrants. The Total Return Series may vary the percentage
of assets invested in any one type of security in accordance with the  Adviser's
interpretation  of  economic and  money market  conditions, fiscal  and monetary
policy and underlying security values. The Series' debt investments may  consist
of  both "investment grade" securities (rated Baa or better by Moody's Investors
Services, Inc.  ("Moody's")  or BBB  or  better  by Standard  &  Poor's  Ratings
Services  ("S&P") or by Fitch Investors Services, Inc. ("Fitch"), and securities
that are unrated or  are in the  lower rating categories (rated  Ba or lower  by
Moody's  or BB  or lower by  S&P or by  Fitch) (commonly known  as "junk bonds")
including up to 20% of its assets in nonconvertible fixed income securities that
are in  these lower  rating categories  and comparable  unrated securities  (see
"Additional  Risk Factors" below). Generally, most of the Series' long-term debt
investments will consist  of "investment  grade" securities. See  Appendix A  to
this Prospectus for a description of these ratings.
 
The  Series may also  invest in United  States government securities, including:
(1) U.S.  Treasury  obligations, which  differ  only in  their  interest  rates,
maturities and times of issuance: U.S. Treasury bills (maturities of one year or
less);  U.S. Treasury notes (maturities of one  to ten years); and U.S. Treasury
bonds (generally maturities of greater than ten years), all of which are  backed
by  the full faith and credit of the U.S. Government; and (2) obligations issued
or guaranteed  by U.S.  Government agencies,  authorities or  instrumentalities,
some  of which  are backed by  the full faith  and credit of  the U.S. Treasury,
E.G., direct  pass-through  certificates  of the  Government  National  Mortgage
Association  ("GNMA"); some of which are supported by the right of the issuer to
borrow from the U.S. Government, E.G.,  obligations of Federal Home Loan  Banks;
and  some of  which are backed  only by the  credit of the  issuer itself, E.G.,
obligations of  the  Student  Loan Marketing  Association  (collectively,  "U.S.
Government  Securities"). The  term "U.S.  Government Securities"  also includes
interests in trusts or other entities representing interests in obligations that
are backed by the full faith and credit of the U.S. Government or are issued  or
guaranteed    by   the   U.S.   Government,   its   agencies,   authorities   or
instrumentalities.
 
Consistent with  the  investment objective  and  policies described  above,  the
Series  may  also invest  up  to 20%  of its  net  assets in  foreign securities
(including emerging market securities and Brady Bonds) which are not traded on a
U.S. exchange.
 
                                       8
<PAGE>
MFS UTILITIES SERIES --  The Utilities Series' investment  objective is to  seek
capital  growth and current income (income above that available from a portfolio
invested entirely in equity securities).
 
The Utilities Series  will seek  to achieve  its objective  by investing,  under
normal  circumstances, at  least 65% (but  up to  100% at the  discretion of the
Adviser) of  its assets  in equity  and  debt securities  of both  domestic  and
foreign  companies in  the utilities  industry. Equity  securities in  which the
Series  may  invest   include  common  stocks,   preferred  stocks,   securities
convertible  into common  stocks or preferred  stocks, and  warrants to purchase
common or preferred  stocks. At least  80% of  the debt securities  held by  the
Series will be rated at the time of investment at least Baa by Moody's or BBB by
S&P  or by Fitch or  will be of comparable quality  as determined by the Adviser
(see "Additional Risk Factors" below). See  Appendix A to this Prospectus for  a
description  of these  ratings. The  Series may also  invest in  debt and equity
securities of issuers in  other industries, as  discussed below, although  under
normal  circumstances  not  more than  35%  of  the Series'  assets  will  be so
invested. In addition, the Series may hold  a portion of its assets in cash  and
money market instruments.
 
Companies  in  the  utilities  industry include  (i)  companies  engaged  in the
manufacture, production,  generation,  transmission,  sale  or  distribution  of
electric,  gas or other  types of energy,  water or other  sanitary services and
(ii) companies  engaged  in telecommunications,  including  telephone,  cellular
telephones,   telegraph,  satellite,  microwave,   cable  television  and  other
communications media (but  not companies  engaged in  public broadcasting).  The
Adviser  deems a particular company  to be in the  utilities industry if, at the
time of investment, the  Adviser determines that at  least 50% of the  company's
assets or revenues are derived from one or more of those industries. The portion
of  the Utilities Series' assets invested in a particular type of utility and in
equity or  debt securities  will vary  in light  of changes  in interest  rates,
market  conditions  and  economic  conditions  and  other  factors.  For further
information on the  principal sectors  of the  utilities industry  in which  the
Series may invest, see Appendix B.
 
Consistent  with  the investment  objective  and policies  described  above, the
Series may  also invest  up  to 35%  of its  net  assets in  foreign  securities
(including emerging market securities and Brady Bonds) which are not traded on a
U.S. exchange.
 
Since  the Utilities Series' investments are concentrated in utility securities,
the value of the Series' shares will be especially affected by factors  peculiar
to  the utilities  industry, and  may fluctuate  more widely  than the  value of
shares of a fund that invests in  a broader range of industries. The rates  many
utility  companies  may charge  their customers  are controlled  by governmental
regulatory commissions  which may  result  in a  delay  in the  utility  company
passing  along increases  in costs  to its  customers. Furthermore,  there is no
assurance that regulatory authorities will, in the future, grant rate  increases
or  that such increases will  be adequate to permit  the payment of dividends on
common stocks. Many  utility companies,  especially electric and  gas and  other
energy   related  utility  companies,  are  subject  to  various  uncertainties,
including: risks of increases in fuel  and other operating costs; the high  cost
of  borrowing  to  finance  capital  construction  during  inflationary periods;
difficulty obtaining adequate returns on invested capital, even if frequent rate
increases are approved by public service commissions; restrictions on operations
and increased costs and delays as  a result of environmental and nuclear  safety
regulations;  securing  financing  for  large  construction  projects  during an
inflationary period; difficulties  of the capital  markets in absorbing  utility
debt and equity securities; difficulty in raising capital in adequate amounts on
reasonable  terms in  periods of high  inflation and  unsettled capital markets;
technological  innovations  which  may  render  existing  plants,  equipment  or
products  obsolete;  the  potential  impact of  natural  or  man-made disasters;
difficulties in obtaining natural gas for resale or fuel for electric generation
at reasonable prices; coping  with the general  effects of energy  conservation,
particularly  in light of changing policies  regarding energy; and special risks
associated with  the  construction and  operation  of nuclear  power  generating
facilities,  including  technical factors  and costs,  and the  possibility that
federal, state and municipal government authorities may from time to time review
existing  requirements  and  impose  additional  requirements.  Certain  utility
companies,  especially gas and telephone utility companies, have in recent years
been affected  by  increased  competition,  which  could  adversely  affect  the
profitability  of such  utility companies. Furthermore,  there are uncertainties
resulting from certain
 
                                       9
<PAGE>
telecommunications   companies'   diversification   into   new   domestic    and
international  businesses as well  as agreements by  many such companies linking
future rate increases to inflation or other factors not directly related to  the
active operating profits of the enterprise.
 
Foreign  utility  companies  are  also  subject  to  regulation,  although  such
regulations may or may not  be comparable to those  in the U.S. Foreign  utility
companies  may be  more heavily regulated  by their  respective governments than
utilities in  the U.S.  and, as  in the  U.S., generally  are required  to  seek
government  approval  for  rate  increases.  In  addition,  since  many  foreign
utilities use fuel that causes more pollution than those used in the U.S.,  such
utilities  may be required to invest in  pollution control equipment to meet any
proposed pollution restrictions. Foreign regulatory systems vary from country to
country and may evolve in ways different from regulation in the U.S.
 
The Utilities Series is  permitted to invest in  securities of issuers that  are
outside  the utilities  industry, although  under normal  circumstances not more
than 35% of the Series' assets will be so invested. Such investments may include
common  stocks,  debt  securities  (including  municipal  debt  securities)  and
preferred  stocks and will be selected  to meet the Series' investment objective
of both capital  growth and current  income. These securities  may be issued  by
either  U.S. or non-U.S. companies.  Some of these issuers  may be in industries
related to the  utilities industry  and, therefore,  may be  subject to  similar
risks.
 
Investments  outside  the utilities  industry may  also include  U.S. Government
Securities,  as  that   term  is  defined   under  "Investment  Objectives   and
Policies--MFS Total Return Series" above. When and if available, U.S. Government
Securities  may be purchased at a discount  from face value. However, the Series
does not intend to hold such securities to maturity for the purpose of achieving
potential  capital  gains,  unless  current  yields  on  the  securities  remain
attractive.
 
MFS  WORLD  GOVERNMENTS  SERIES  --  The  World  Governments  Series' investment
objective is  to  seek not  only  preservation,  but also  growth,  of  capital,
together with moderate current income.
 
The World Governments Series seeks to achieve its investment objective through a
professionally   managed,   internationally  diversified   portfolio  consisting
primarily of  debt securities  and to  a lesser  extent equity  securities.  The
Series  attempts to provide  investors with an opportunity  to enhance the value
and increase the protection of their investment against inflation and  otherwise
by  taking advantage of investment opportunities in the U.S. as well as in other
countries where  opportunities  may  be  more rewarding.  It  is  believed  that
diversification  of assets  on an  international basis  decreases the  degree to
which events  in any  one country,  including the  U.S., can  affect the  entire
portfolio.  Although the percentage of the Series' assets invested in securities
issued abroad and denominated in foreign  currencies will vary depending on  the
state  of the economies of the principal countries of the world, their financial
markets and  the relationship  of their  currencies to  the U.S.  dollar,  under
normal conditions the Series' portfolio is internationally diversified. However,
for  temporary defensive reasons  or during times  of international political or
economic uncertainty or turmoil, most or  all of the Series' investments may  be
in the U.S.
 
Under  normal  economic  and market  conditions,  at  least 80%  of  the Series'
portfolio is invested in  debt securities, such  as bonds, debentures,  mortgage
securities,  notes,  commercial paper,  obligations  issued or  guaranteed  by a
government or any of its political subdivisions, agencies or  instrumentalities,
certificates  of deposit, as well  as debt obligations which  may have a call on
common stock by means of a conversion privilege or attached warrants.
 
Consistent with  its  investment objective  and  policies described  above,  the
Series may invest up to 100% (and generally expects to invest not more than 80%)
of  its net assets  in foreign securities  (including emerging market securities
and Brady  Bonds)  which  are  not  traded on  a  U.S.  exchange.  Although  the
percentage  of the Series'  assets invested in foreign  securities will vary, at
least 65% of the  Series' assets will  be invested in  at least three  different
countries,  one  of which  may be  the  United States,  except when  the Adviser
believes that investing  for temporary  defensive purposes  is appropriate.  The
Adviser  will determine the amount of the World Governments Series' assets to be
invested in the United  States and the  amount to be  invested abroad. The  U.S.
assets will be invested in high quality debt securities and the remainder of the
assets  will be diversified among countries where opportunities for total return
are  expected   to  be   most  attractive.   It  is   currently  expected   that
 
                                       10
<PAGE>
investments  within foreign countries will be primarily in government securities
to minimize credit risks. The Series will not invest 25% or more of the value of
its assets in the securities of  any one foreign government. The portfolio  will
be  managed actively  and the  asset allocations  modified as  the Adviser deems
necessary.
 
The World Governments Series will purchase non-dollar securities denominated  in
the  currency of countries  where the interest  rate environment as  well as the
general economic climate provide an opportunity for declining interest rates and
currency appreciation.  If interest  rates decline,  such non-dollar  securities
will  appreciate in value. If the  currency also appreciates against the dollar,
the total investment in  such non-dollar securities  would be enhanced  further.
Conversely, a rise in interest rates or decline in currency exchange rates would
adversely  affect  the  Series' return.  Investments  in  non-dollar denominated
securities are  evaluated primarily  on the  strength of  a particular  currency
against the dollar and on the interest rate climate of that country. Currency is
judged  on the basis of fundamental  economic criteria (E.G., relative inflation
levels and  trends,  growth rate  forecasts,  balance of  payments  status,  and
economic  policies) as well as technical and  political data. In addition to the
foregoing, interest  rates  are  evaluated  on the  basis  of  differentials  or
anomalies  that  may  exist between  different  countries. The  Series  may hold
foreign currency received in connection  with investments in foreign  securities
and  in  anticipation of  purchasing foreign  securities. (See  "Additional Risk
Factors" below.)
 
The phrase  "preservation of  capital"  when applied  to a  domestic  investment
company  is generally understood to imply that the portfolio is invested in very
low risk securities and that the major risk is loss of purchasing power  through
the  effects of inflation or major changes in interest rates. However, while the
World Governments  Series  invests in  securities  which are  believed  to  have
minimal credit risk, an error of judgment in selecting a currency or an interest
rate environment could result in a loss of capital.
 
It is contemplated that the World Governments Series' long-term debt investments
will  consist primarily of securities which are believed by the Adviser to be of
relatively high quality.  If after  the Series  purchases such  a security,  the
quality  of the security  deteriorates significantly, the  security will be sold
only if the Adviser believes it is advantageous to do so.
 
5.  INVESTMENT TECHNIQUES
 
LENDING OF PORTFOLIO SECURITIES: Each Series may seek to increase its income  by
lending  portfolio securities. Such  loans will usually be  made to member firms
(and subsidiaries thereof) of the New  York Stock Exchange (the "Exchange")  and
to  member banks  of the  Federal Reserve  System, and  would be  required to be
secured continuously  by collateral  in  cash, U.S.  Treasury securities  or  an
irrevocable letter of credit maintained on a current basis at an amount at least
equal to the market value of the securities loaned. If the Adviser determines to
make  securities loans, it is  intended that the value  of the securities loaned
would not exceed 10%  of the value of  the net assets of  the Series making  the
loans.
 
EMERGING  MARKET SECURITIES:  Consistent with their  respective objectives, each
Series may  invest  in securities  of  issuers whose  principal  activities  are
located  in  emerging market  countries. Emerging  market countries  include any
country determined by  the Adviser to  have an emerging  market economy,  taking
into  account a number of  factors, including whether the  country has a low- to
middle- income economy  according to the  International Bank for  Reconstruction
and  Development, the country's foreign currency  debt rating, its political and
economic stability and the development of its financial and capital markets. The
Adviser determines whether an  issuer's principal activities  are located in  an
emerging   market  country  by  considering  such  factors  as  its  country  of
organization, the principal trading market for its securities and the source  of
its  revenues and assets. The issuer's principal activities generally are deemed
to be  located  in a  particular  country if:  (a)  the security  is  issued  or
guaranteed by the government of that country or any of its agencies, authorities
or  instrumentalities;  (b)  the issuer  is  organized  under the  laws  of, and
maintains a principal office in that  country; (c) the issuer has its  principal
securities trading market in that country; (d) the issuer derives 50% or more of
its total revenues from goods sold or services performed in that country; or (e)
the issuer has 50% or more of its assets in that country.
 
BRADY BONDS: Each Series may invest in Brady Bonds, which are securities created
through  the exchange  of existing commercial  bank loans to  public and private
entities in  certain emerging  markets for  new bonds  in connection  with  debt
 
                                       11
<PAGE>
restructurings  under  a  debt  restructuring  plan  introduced  by  former U.S.
Secretary of the Treasury, Nicholas F. Brady (the "Brady Plan"). Brady Plan debt
restructurings have been  implemented to  date in  Argentina, Brazil,  Bulgaria,
Costa  Rica, Dominican Republic,  Ecuador, Jordan, Mexico,  Nigeria, Panama, the
Philippines, Poland, Uruguay  and Venezula.  Brady Bonds have  been issued  only
recently,  and for that reason  do not have a  long payment history. Brady Bonds
may be collateralized or uncollateralized, are issued in various currencies (but
primarily the U.S. dollar) and are actively traded in over-the-counter secondary
markets. U.S.  dollar-denominated,  collateralized  Brady Bonds,  which  may  be
fixed-rate bonds or floating-rate bonds, are generally collateralized in full as
to  principal by U.S. Treasury zero coupon bonds having the same maturity as the
bonds.  Brady  Bonds  are  often  viewed  as  having  three  or  four  valuation
components:  the collateralized  repayment of  principal at  final maturity; the
collateralized interest payments;  the uncollateralized  interest payments;  and
any  uncollateralized repayment of principal at maturity (these uncollateralized
amounts constituting the  "residual risk").  In light  of the  residual risk  of
Brady  Bonds and the history  of defaults of countries  issuing Brady Bonds with
respect to commercial bank loans by public and private entities, investments  in
Brady Bonds may be viewed as speculative.
 
REPURCHASE AGREEMENTS: Each Series may enter into repurchase agreements in order
to  earn income on available  cash or as a  temporary defensive measure. Under a
repurchase agreement,  a  Series acquires  securities  subject to  the  seller's
agreement  to repurchase at  a specified time  and price. If  the seller becomes
subject to a proceeding  under the bankruptcy laws  or its assets are  otherwise
subject  to a stay order,  the Series' right to  liquidate the securities may be
restricted (during which  time the value  of the securities  could decline).  As
discussed  in the  SAI, each Series  has adopted certain  procedures intended to
minimize risk.
 
"WHEN-ISSUED" SECURITIES: The Total Return  Series and the Utilities Series  may
purchase  securities on a "when-issued" or  on a "forward delivery" basis, which
means that the  securities will  be delivered  to the  Series at  a future  date
usually  beyond customary settlement time. The commitment to purchase a security
for which  payment will  be made  on  a future  date may  be deemed  a  separate
security.  In  general,  the  Series  does not  pay  for  such  securities until
received, and  does not  start  earning interest  on  the securities  until  the
contractual  settlement date. While awaiting delivery of securities purchased on
such bases, a  Series will normally  invest in cash,  cash equivalents and  high
grade debt securities.
 
MORTGAGE "DOLLAR ROLL" TRANSACTIONS: Each Series may enter into mortgage "dollar
roll"  transactions with selected  banks and broker-dealers  pursuant to which a
Series sells mortgage-backed  securities for delivery  in the future  (generally
within 30 days) and simultaneously contracts to repurchase substantially similar
(same type, coupon and maturity) securities on a specified future date. A Series
will  only enter  into covered  rolls. A  "covered roll"  is a  specific type of
dollar roll for which there is an offsetting cash position or a cash  equivalent
security  position which matures on or before the forward settlement date of the
dollar roll  transaction. In  the event  that  the party  with whom  the  Series
contracts  to replace substantially similar securities on a future date fails to
deliver such securities, the Series may not be able to obtain such securities at
the price specified in  such contract and  thus may not  benefit from the  price
differential between the current sales price and the repurchase price.
 
RESTRICTED  SECURITIES:  Each  Series  may  purchase  securities  that  are  not
registered  under  the  Securities  Act   of  1933  ("1933  Act")   ("restricted
securities"),  including  those  that  can be  offered  and  sold  to "qualified
institutional  buyers"  under  Rule  144A   under  the  1933  Act  ("Rule   144A
securities").  The Trust's Board of Trustees determines, based upon a continuing
review of the trading  markets for a specific  Rule 144A security, whether  such
security  is liquid and thus not subject  to the Series' limitation on investing
not more  than 15%  of its  net assets  in illiquid  investments. The  Board  of
Trustees  has  adopted guidelines  and delegated  to MFS  the daily  function of
determining and monitoring  the liquidity  of Rule 144A  securities. The  Board,
however,  will retain sufficient oversight and be ultimately responsible for the
determinations. The Board  will carefully  monitor each  Series' investments  in
Rule  144A  securities, focusing  on such  important  factors, among  others, as
valuation, liquidity and availability  of information. This investment  practice
could  have the effect of  decreasing the level of liquidity  in a Series to the
extent that qualified  institutional buyers  become for a  time uninterested  in
purchasing Rule 144A securities held in a Series' portfolio.
 
                                       12
<PAGE>
CORPORATE  ASSET-BACKED SECURITIES:  The Total  Return Series  and the Utilities
Series may invest in corporate asset-backed securities. These securities, issued
by trusts and special purpose corporations, are backed by a pool of assets, such
as credit card and automobile loan receivables, representing the obligations  of
a number of different parties.
 
Corporate  asset-backed securities present  certain risks. For  instance, in the
case of credit card  receivables, these securities may  not have the benefit  of
any  security interest  in the related  collateral. Credit  card receivables are
generally unsecured and the debtors are  entitled to the protection of a  number
of  state and federal consumer credit laws,  many of which give such debtors the
right to set off certain amounts owed on the credit cards, thereby reducing  the
balance  due. Most  issuers of  automobile receivables  permit the  servicers to
retain possession of the  underlying obligations. If the  servicer were to  sell
these  obligations to another  party, there is  a risk that  the purchaser would
acquire an interest superior  to that of the  holders of the related  automobile
receivables.  In addition, because of the large number of vehicles involved in a
typical issuance and technical  requirements under state  laws, the trustee  for
the  holders  of  the automobile  receivables  may  not have  a  proper security
interest in all of the obligations backing such receivables. Therefore, there is
the possibility  that recoveries  on  repossessed collateral  may not,  in  some
cases,  be available  to support  payments on  these securities.  The underlying
assets  (E.G.,  loans)  are  also  subject  to  prepayments  which  shorten  the
securities' weighted average life and may lower their return.
 
Corporate  asset-backed  securities  are  often  backed  by  a  pool  of  assets
representing the obligations  of a number  of different parties.  To lessen  the
effect  of  failures by  obligors  on underlying  assets  to make  payments, the
securities  may  contain  elements  of  credit  support  which  fall  into   two
categories:  (i)  liquidity  protection;  and  (ii)  protection  against  losses
resulting from  ultimate  default  by  an  obligor  on  the  underlying  assets.
Liquidity  protection  refers to  the provision  of  advances, generally  by the
entity administering the pool of assets, to ensure that the receipt of  payments
on  the underlying  pool occurs in  a timely fashion.  Protection against losses
resulting from ultimate  default ensures payment  through insurance policies  or
letters of credit obtained by the issuer or sponsor from third parties. A Series
will  not pay any additional or separate  fees for credit support. The degree of
credit support  provided  for  each  issue  is  generally  based  on  historical
information  respecting the level of credit  risk associated with the underlying
assets. Delinquency or  loss in  excess of that  anticipated or  failure of  the
credit  support could  adversely affect  the return on  an investment  in such a
security.
 
ZERO COUPON BONDS, DEFERRED INTEREST BONDS AND PIK BONDS: Each Series may invest
in zero  coupon bonds.  The Total  Return  Series may  also invest  in  deferred
interest  bonds and PIK bonds. Zero coupon  and deferred interest bonds are debt
obligations which are issued  or purchased at a  significant discount from  face
value.  The discount  approximates the total  amount of interest  the bonds will
accrue and compound over the period until maturity or the first interest payment
date at a rate  of interest reflecting  the market rate of  the security at  the
time of issuance. While zero coupon bonds do not require the periodic payment of
interest,  deferred  interest bonds  provide for  a period  of delay  before the
regular payment of interest begins. PIK bonds are debt obligations which provide
that the issuer thereof may, at its  option, pay interest on such bonds in  cash
or  in the  form of  additional debt  obligations. Such  investments benefit the
issuer by mitigating its need for cash to meet debt service, but also require  a
higher  rate of return to attract investors  who are willing to defer receipt of
such cash. Such investments  may experience greater  volatility in market  value
due  to  changes in  interest  rates than  debt  obligations which  make regular
payments of interest. Each Series will accrue income on such investments for tax
and accounting purposes, as required, which is distributable to shareholders and
which, because no  cash is  received at  the time  of accrual,  may require  the
liquidation  of other portfolio  securities to satisfy  the Series' distribution
obligations.
 
COLLATERALIZED MORTGAGE OBLIGATIONS AND MULTICLASS PASS-THROUGH SECURITIES:  The
World  Governments Series and the  Utilities Series may invest  a portion of its
assets  in  collateralized  mortgage  obligations  or  "CMOs,"  which  are  debt
obligations   collateralized   by  mortgage   loans  or   mortgage  pass-through
securities. Typically, CMOs are collateralized  by certificates issued by  GNMA,
the  Federal National  Mortgage Association  ("FNMA") or  the Federal  Home Loan
Mortgage
 
                                       13
<PAGE>
Corporation  ("FHLMC"), but also may be collateralized by whole loans or private
mortgage pass-through securities  (such collateral collectively  referred to  as
"Mortgage Assets"). Each of these Series may also invest a portion of its assets
in multiclass pass-through securities which are interests in a trust composed of
Mortgage  Assets. CMOs (which include multiclass pass-through securities) may be
issued by agencies, authorities or  instrumentalities of the U.S. Government  or
by  private originators of,  or investors in,  mortgage loans, including savings
and loan associations,  mortgage banks, commercial  banks, investment banks  and
special  purpose subsidiaries  of the  foregoing. Payments  of principal  of and
interest on the Mortgage  Assets, and any  reinvestment income thereon,  provide
the funds to pay debt service on the CMOs or make scheduled distributions on the
multiclass  pass-through securities. In a CMO, a series of bonds or certificates
are usually issued in multiple classes with different maturities. Each class  of
CMOs,  often  referred to  as  a "tranche,"  is issued  at  a specific  fixed or
floating coupon  rate and  has a  stated maturity  or final  distribution  date.
Principal  prepayments on the Mortgage  Assets may cause the  CMOs to be retired
substantially earlier than their stated maturities or final distribution  dates,
resulting  in a loss of all or part of the premium if any has been paid. Certain
classes of  CMOs  have priority  over  others with  respect  to the  receipt  of
prepayments  on the mortgages. Therefore, depending on the type of CMOs in which
a Series invests, the investment may be  subject to a greater or lesser risk  of
prepayments than other types of mortgage-related securities.
 
The  World  Governments  Series and  the  Utilities  Series may  also  invest in
parallel pay CMOs and  Planned Amortization Class  CMOs ("PAC Bonds").  Parallel
pay CMOs are structured to provide payments of principal on each payment date to
more  than one class. PAC Bonds generally require payments of a specified amount
of principal on each payment date. PAC  Bonds are always parallel pay CMOs  with
the  required principal payment  on such securities  having the highest priority
after interest has been paid to all classes. For a further description of  CMOs,
parallel  pay CMOs and PAC Bonds and  the risks related to transactions therein,
see the SAI.
 
STRIPPED MORTGAGE-BACKED SECURITIES: The World  Governments Series may invest  a
portion of its assets in stripped mortgage-backed securities ("SMBS"), which are
derivative  multiclass mortgage  securities usually structured  with two classes
that receive different proportions of interest and principal distributions  from
an underlying pool of mortgage assets. For a further description of SMBS and the
risks related to transactions therein, see the SAI.
 
LOAN  PARTICIPATIONS AND OTHER DIRECT INDEBTEDNESS:  The Total Return Series may
invest a  portion  of its  assets  in  "loan participations"  and  other  direct
indebtedness.  By purchasing a  loan participation, the  Series acquires some or
all of the  interest of  a bank  or other  lending institution  in a  loan to  a
corporate  borrower. Many  such loans are  secured, and  most impose restrictive
covenants which must be met by the  borrower. These loans are made generally  to
finance  internal  growth, mergers,  acquisitions, stock  repurchases, leveraged
buy-outs and other  corporate activities. Such  loans may be  in default at  the
time of purchase. The Series may also purchase other direct indebtedness such as
trade or other claims against companies, which generally represent money owed by
the  company  to a  supplier of  goods and  services. These  claims may  also be
purchased at  a  time when  the  company is  in  default. Certain  of  the  loan
participations  and other direct indebtedness acquired by the Series may involve
revolving  credit  facilities  or  other  standby  financing  commitments  which
obligate the Series to pay additional cash on a certain date or on demand.
 
The highly leveraged nature of many such loans and other direct indebtedness may
make  such loans especially vulnerable to  adverse changes in economic or market
conditions. Loan participations and other direct indebtedness may not be in  the
form  of securities  or may  be subject  to restrictions  on transfer,  and only
limited opportunities may  exist to resell  such instruments. As  a result,  the
Series  may be unable to sell such investments  at an opportune time or may have
to resell them at less than fair market value. For a further discussion of  loan
participations,  other direct indebtedness and the risks related to transactions
therein, see the SAI.
 
MORTGAGE  PASS-THROUGH  SECURITIES:  The  Total  Return  Series  and  the  World
Governments  Series  may invest  in  mortgage pass-through  securities. Mortgage
pass-through securities  are securities  representing  interests in  "pools"  of
mortgage  loans.  The  Utilities  Series  may  invest  in  mortgage pass-through
securities that are securities issued or guaranteed as to principal and interest
by the U.S. Government, its agencies, authorities or instrumentalities.  Monthly
payments of interest and
 
                                       14
<PAGE>
principal  by the  individual borrowers on  mortgages are passed  through to the
holders of the securities (net  of fees paid to the  issuer or guarantor of  the
securities)  as the  mortgages in  the underlying  mortgage pools  are paid off.
Payment of principal and interest on some mortgage pass-through securities  (but
not the market value of the securities themselves) may be guaranteed by the full
faith and credit of the U.S. Government (in the case of securities guaranteed by
GNMA);  or guaranteed by U.S. Government-sponsored corporations (such as FNMA or
FHLMC, which  are supported  only by  the discretionary  authority of  the  U.S.
Government   to  purchase  the   agency's  obligations).  Mortgage  pass-through
securities may also be  issued by non-governmental  issuers (such as  commercial
banks,  savings  and loan  institutions,  private mortgage  insurance companies,
mortgage bankers and other secondary market issuers). See the SAI for a  further
discussion of these securities.
 
INDEXED  SECURITIES: Each Series may invest in indexed securities whose value is
linked to  foreign currencies,  interest rates,  commodities, indices  or  other
financial  indicators. Most  indexed securities  are short  to intermediate term
fixed-income securities whose values at  maturity and/or interest rates rise  or
fall  according to the  change in one or  more specified underlying instruments.
Indexed securities may be  positively or negatively  indexed (I.E., their  value
may increase or decrease if the underlying instrument appreciates), and may have
return   characteristics  similar  to  direct   investments  in  the  underlying
instrument or  to one  or more  options on  the underlying  instrument.  Indexed
securities may be more volatile than the underlying instrument itself.
 
SWAPS AND RELATED TRANSACTIONS: As one way of managing its exposure to different
types  of investments, the World Governments Series may enter into interest rate
swaps, currency swaps  and other  types of  available swap  agreements, such  as
caps,  collars and floors. Swaps involve the exchange by the Series with another
party of cash payments based  upon different interest rate indexes,  currencies,
and  other prices or rates, such as  the value of mortgage prepayment rates. For
example, in the typical interest rate swap, the Series might exchange a sequence
of cash payments based  on a floating  rate index for cash  payments based on  a
fixed  rate. Payments made by both parties to  a swap transaction are based on a
principal amount determined by the parties.
 
The World  Governments  Series may  also  purchase  and sell  caps,  floors  and
collars.  In a typical cap or floor agreement, one party agrees to make payments
only under specified circumstances,  usually in return for  payment of a fee  by
the counterparty. For example, the purchase of an interest rate cap entitles the
buyer,  to the  extent that a  specified index exceeds  a predetermined interest
rate, to receive payments of interest on a contractually-based principal  amount
from  the counterparty selling such  interest rate cap. The  sale of an interest
rate floor obligates the seller to make payments to the extent that a  specified
interest  rate falls below  an agreed-upon level.  A collar arrangement combines
elements of buying a cap and selling a floor.
 
Swap agreements will tend to shift the Series' investment exposure from one type
of investment to another. For example, if the Series agreed to exchange payments
in dollars for payments in foreign currency, in each case based on a fixed rate,
the swap agreement would tend to decrease the Series' exposure to U.S.  interest
rates and increase its exposure to foreign currency and interest rates. Caps and
floors  have an effect  similar to buying  or writing options.  Depending on how
they are used, swap agreements may  increase or decrease the overall  volatility
of the Series' investments and its share price and yield.
 
Swap  agreements are sophisticated hedging  instruments that typically involve a
small investment  of cash  relative to  the  magnitude of  risks assumed.  As  a
result,  swaps can be highly volatile and  may have a considerable impact on the
Series' performance.  Swap  agreements  are  subject to  risks  related  to  the
counterparty's   ability  to   perform,  and  may   decline  in   value  if  the
counterparty's creditworthiness deteriorates. The Series may also suffer  losses
if  it is unable to terminate outstanding swap agreements or reduce its exposure
through offsetting transactions.
 
Swaps, caps, floors and collars are highly specialized activities which  involve
certain  risks. See the SAI  for further information on,  and the risks involved
in, these activities.
 
OPTIONS ON SECURITIES: The Total Return Series and the World Governments  Series
may  write (sell) covered put and call options and purchase put and call options
on securities. Each  of these Series  will write options  on securities for  the
purpose
 
                                       15
<PAGE>
of  increasing  its return  and/or to  protect  the value  of its  portfolio. In
particular, where  a Series  writes an  option that  expires unexercised  or  is
closed  out by the Series at  a profit, it will retain  the premium paid for the
option which will increase its gross income and will offset in part the  reduced
value  of the portfolio security underlying the option, or the increased cost of
portfolio securities to be acquired. In  contrast, however, if the price of  the
underlying  security moves adversely to the  Series' position, the option may be
exercised and the  Series will be  required to purchase  or sell the  underlying
security  at a disadvantageous price, which may  only be partially offset by the
amount of the premium. Each Series may  also write combinations of put and  call
options  on  the  same security,  known  as "straddles."  Such  transactions can
generate additional premium income but also present increased risk.
 
By writing a  call option  on a  security, a  Series limits  its opportunity  to
profit  from any increase in the market  value of the underlying security, since
the holder will usually exercise  the call option when  the market value of  the
underlying  security exceeds the exercise price of the call. However, the Series
retains the risk of depreciation in value of securities on which it has  written
call options.
 
Each  of these Series may  also purchase put or  call options in anticipation of
market fluctuations which may adversely affect the value of its portfolio or the
prices of securities that the Series wants  to purchase at a later date. In  the
event  that the expected  market fluctuations occur,  the Series may  be able to
offset the  resulting adverse  effect on  its portfolio,  in whole  or in  part,
through  the options purchased. The  premium paid for a  put or call option plus
any transaction costs will  reduce the benefit, if  any, realized by the  Series
upon  exercise  or liquidation  of  the option,  and,  unless the  price  of the
underlying security changes sufficiently, the option may expire without value to
the Series.
 
OPTIONS ON STOCK INDICES: The Total  Return Series and the Utilities Series  may
write  (sell) covered call and put options  and purchase call and put options on
stock indices. Each of these Series may  write options on stock indices for  the
purpose  of increasing  its gross  income and  to protect  its portfolio against
declines in  the value  of  securities it  owns or  increases  in the  value  of
securities  to be acquired. When a Series writes an option on a stock index, and
the value of the index moves adversely to the holder's position, the option will
not be exercised, and the Series will either close out the option at a profit or
allow it to  expire unexercised. Each  of these Series  will thereby retain  the
amount  of the premium, less related  transaction costs, which will increase its
gross income and offset part of the reduced value of portfolio securities or the
increased cost of securities  to be acquired.  Such transactions, however,  will
constitute  only partial  hedges against  adverse price  fluctuations, since any
such fluctuations will be offset only to the extent of the premium received by a
Series for  the  writing of  the  option,  less related  transaction  costs.  In
addition,  if the  value of  an underlying  index moves  adversely to  a Series'
option position, the option may be  exercised, and the Series will experience  a
loss which may only be partially offset by the amount of the premium received.
 
Each  of these Series may also purchase put  or call options on stock indices in
order, respectively, to hedge its investments  against a decline in value or  to
attempt  to reduce the risk  of missing a market  or industry segment advance. A
Series' possible loss in either case will be limited to the premium paid for the
option, plus related transaction costs.
 
"YIELD CURVE" OPTIONS: The Total Return Series and the World Governments  Series
may enter into options on the yield "spread," or yield differential, between two
securities, a transaction referred to as a "yield curve" option, for hedging and
non-hedging  (an effort  to increase  current income)  purposes. In  contrast to
other types of options, a yield curve option is based on the difference  between
the  yields  of  designated securities  rather  than  the actual  prices  of the
individual securities,  and is  settled through  cash payments.  Accordingly,  a
yield  curve option is profitable to the  holder if this differential widens (in
the case of a call) or narrows (in the case of a put), regardless of whether the
yields of the underlying  securities increase or  decrease. Yield curve  options
written  by a  Series will be  covered as described  in the SAI.  The trading of
yield curve options is  subject to all the  risks associated with trading  other
types  of options, as discussed below under "Additional Risk Factors" and in the
SAI. In addition, such options present risks of loss even if the yield on one of
the underlying securities remains constant, if  the spread moves in a  direction
or to an extent which was not anticipated.
 
                                       16
<PAGE>
FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS: Each Series may purchase and
sell Futures Contracts on foreign or domestic fixed income securities or indices
of  such securities, including  municipal bond indices and  any other indices of
foreign or  domestic  fixed income  securities  that may  become  available  for
trading.  Each  of these  Series may  also  purchase and  write options  on such
Futures Contracts ("Options on Futures Contracts"). The Total Return Series  may
purchase  and sell Futures Contracts on  stock indices. The Total Return Series,
the World Governments  Series and  the Utilities  Series may  purchase and  sell
Futures  Contracts on foreign currencies or  indices of foreign currencies. Each
of these Series may also purchase and write Options on such Futures Contracts.
 
Such transactions will be entered into  for hedging purposes or for  non-hedging
purposes  to the extent permitted  by applicable law. Each  of these Series will
incur brokerage fees when it purchases and sells Futures Contracts, and will  be
required  to  maintain margin  deposits. In  addition, Futures  Contracts entail
risks. Although the Adviser believes that  use of such contracts will benefit  a
Series, if its investment judgment about the general direction of exchange rates
or  the stock market is incorrect, the Series' overall performance may be poorer
than if it had not entered into any  such contract and the Series may realize  a
loss.  A  Series  will  not  enter  into  any  Futures  Contract  if immediately
thereafter the value  of securities  and other obligations  underlying all  such
Futures Contracts held by such Series would exceed 50% of the value of its total
assets.
 
Purchases  of Options on  Futures Contracts may  present less risk  in hedging a
Series' portfolio than the purchase or sale of the underlying Futures  Contracts
since  the potential loss is  limited to the amount  of the premium plus related
transaction costs,  although it  may  be necessary  to  exercise the  option  to
realize  any profit, which  results in the establishment  of a futures position.
The writing of Options on Futures Contracts, however, does not present less risk
than the trading of Futures Contracts and will constitute only a partial  hedge,
up  to  the  amount  of the  premium  received.  In addition,  if  an  option is
exercised, a Series may suffer a loss on the transaction.
 
Futures Contracts and Options  on Futures Contracts that  are entered into by  a
Series will be traded on U.S. and foreign exchanges.
 
FORWARD  CONTRACTS: Each Series may enter into forward foreign currency exchange
contracts for the purchase or sale of a fixed quantity of a foreign currency  at
a  future  date  ("Forward  Contracts").  Each  Series  may  enter  into Forward
Contracts for hedging purposes and  for non-hedging purposes (I.E.,  speculative
purposes).  By  entering  into  transactions in  Forward  Contracts  for hedging
purposes, a  Series may  be  required to  forego  the benefits  of  advantageous
changes in exchange rates and, in the case of Forward Contracts entered into for
non-hedging  purposes, a Series  may sustain losses which  will reduce its gross
income. Such transactions, therefore,  could be considered speculative.  Forward
Contracts  are  traded  over-the-counter  and not  on  organized  commodities or
securities exchanges.  As  a  result,  Forward Contracts  operate  in  a  manner
distinct  from exchange-traded instruments, and their use involves certain risks
beyond those associated with transactions in Futures Contracts or options traded
on exchanges. A Series may choose to, or be required to, receive delivery of the
foreign currencies  underlying  Forward Contracts  it  has entered  into.  Under
certain  circumstances, such as  where the Adviser  believes that the applicable
exchange rate is  unfavorable at  the time the  currencies are  received or  the
Adviser  anticipates, for any other reason, that the exchange rate will improve,
the Series  may hold  such currencies  for an  indefinite period  of time.  Each
Series  may also enter into a Forward  Contract on one currency to hedge against
risk of  loss  arising from  fluctuations  in the  value  of a  second  currency
(referred  to  as  a  "cross hedge")  if,  in  the judgment  of  the  Adviser, a
reasonable degree of correlation can be expected between movements in the values
of the two currencies.  Each Series has  established procedures consistent  with
statements  of the SEC and  its staff regarding the  use of Forward Contracts by
registered investment  companies, which  requires use  of segregated  assets  or
"cover" in connection with the purchase and sale of such contracts.
 
OPTIONS  ON FOREIGN CURRENCIES: Each Series  may also purchase and write options
on foreign  currencies ("Options  on  Foreign Currencies")  for the  purpose  of
protecting  against declines  in the  dollar value  of portfolio  securities and
against increases in the  dollar cost of  securities to be  acquired. As in  the
case  of other types  of options, however,  the writing of  an Option on Foreign
Currency will constitute only a partial hedge,  up to the amount of the  premium
received, and a Series may be required to purchase or sell foreign currencies at
disadvantageous   exchange  rates,   thereby  incurring   losses.  The  purchase
 
                                       17
<PAGE>
of an  Option on  Foreign Currency  may constitute  an effective  hedge  against
fluctuations  in exchange rates although, in the event of rate movements adverse
to a Series' position, it may forfeit the entire amount of the premium paid  for
the  option plus related transaction  costs. A Series may  also choose to, or be
required to, receive delivery  of the foreign  currencies underlying Options  on
Foreign  Currencies it  has entered into.  Under certain  circumstances, such as
where the Adviser believes that the  applicable exchange rate is unfavorable  at
the  time the currencies are received or  the Adviser anticipates, for any other
reason, that the exchange rate will  improve, a Series may hold such  currencies
for an indefinite period of time.
 
6.  ADDITIONAL RISK FACTORS
 
OPTIONS,  FUTURES  CONTRACTS AND  FORWARD CONTRACTS:  Although each  Series will
enter into  certain  transactions  in options,  Futures  Contracts,  Options  on
Futures  Contracts,  Forward Contracts  and  Options on  Foreign  Currencies for
hedging purposes,  such transactions  nevertheless  involve certain  risks.  For
example,  a lack of  correlation between the instrument  underlying an option or
Futures Contract  and  the assets  being  hedged, or  unexpected  adverse  price
movements, could render a Series' hedging strategy unsuccessful and could result
in  losses.  A  Series also  may  enter  into transactions  in  options, Futures
Contracts, Options on  Futures Contracts  and Forward Contracts  for other  than
hedging  purposes, which involves greater risk. In particular, such transactions
may result in losses a Series which  are not offset by gains on other  portfolio
positions,  thereby reducing gross income. In addition, foreign currency markets
may be extremely volatile from time to time. There also can be no assurance that
a liquid secondary market will exist for  any contract purchased or sold, and  a
Series  may be  required to  maintain a  position until  exercise or expiration,
which could result in losses. The SAI  contains a description of the nature  and
trading  mechanics of options, Futures  Contracts, Options on Futures Contracts,
Forward Contracts and Options on  Foreign Currencies, and includes a  discussion
of the risks related to transactions therein.
 
Transactions   in  Forward   Contracts  may   be  entered   into  only   in  the
over-the-counter market. Futures Contracts and Options on Futures Contracts  may
be  entered into  on U.S. exchanges  regulated by the  Commodity Futures Trading
Commission and on  foreign exchanges.  In addition, the  securities and  indexes
underlying options, Futures Contracts and Options on Futures Contracts traded by
the Series will include both domestic and foreign securities.
 
LOWER  RATED BONDS: The Total Return Series  and the Utilities Series may invest
in fixed income  securities rated  Baa by  Moody's or BBB  by S&P  or Fitch  and
comparable  unrated  securities.  These  securities,  while  normally exhibiting
adequate protection parameters, have speculative characteristics and changes  in
economic conditions or other circumstances are more likely to lead to a weakened
capacity  to make  principal and  interest payments than  in the  case of higher
grade securities.
 
Each of these Series may also invest in securities rated Ba or lower by  Moody's
or BB or lower by S&P or Fitch and comparable unrated securities (commonly known
as  "junk  bonds")  to  the  extent described  above.  See  Appendix  A  to this
Prospectus for a description of  these ratings. These securities are  considered
speculative  and, while generally  providing greater income  than investments in
higher rated  securities, will  involve  greater risk  of principal  and  income
(including  the  possibility of  default or  bankruptcy of  the issuers  of such
securities) and  may  involve greater  volatility  of price  (especially  during
periods  of economic uncertainty or change) than securities in the higher rating
categories. However, since yields  vary over time, no  specific level of  income
can  ever be  assured. These lower  rated high yielding  fixed income securities
generally tend to reflect economic changes and short-term corporate and industry
developments to  a  greater extent  than  higher rated  securities  which  react
primarily to fluctuations in the general level of interest rates (although these
lower  rated fixed  income securities are  also affected by  changes in interest
rates, the market's  perception of  their credit  quality, and  the outlook  for
economic  growth). In  the past, economic  downturns or an  increase in interest
rates have, under certain circumstances, caused a higher incidence of default by
the issuers of these securities and may  do so in the future, especially in  the
case of highly leveraged issuers. During certain periods, the higher yields on a
Series'  lower rated  high yielding fixed  income securities  are paid primarily
because of the increased risk of loss of principal and income, arising from such
factors as the heightened possibility of default or bankruptcy of the issuers of
such securities. Due to the fixed income payments of these securities, a  Series
may continue to earn the same level of interest income while its net asset value
declines  due to  portfolio losses,  which could  result in  an increase  in the
Series' yield despite the actual loss  of principal. The market for these  lower
 
                                       18
<PAGE>
rated  fixed income securities may be less liquid than the market for investment
grade fixed income securities, and judgment may at times play a greater role  in
valuing  these  securities than  in the  case of  investment grade  fixed income
securities. Changes in the value  of securities subsequent to their  acquisition
will  not  affect cash  income or  yield to  maturity  to a  Series but  will be
reflected in the net asset value of shares  of the Series. See the SAI for  more
information on lower rated securities.
 
FOREIGN   SECURITIES:  Each   Series  may   invest  in   dollar-denominated  and
non-dollar/denominated foreign securities.  Investing in  securities of  foreign
issuers  generally involves  risks not  ordinarily associated  with investing in
securities of  domestic  issuers.  These  include  changes  in  currency  rates,
exchange   control  regulations,  governmental  administration  or  economic  or
monetary policy (in the  United States or abroad)  or circumstances in  dealings
between  nations. Costs may  be incurred in  connection with conversions between
various  currencies.  Special  considerations  may  also  include  more  limited
information  about foreign issuers, higher brokerage costs, different accounting
standards and thinner trading  markets. Foreign securities  markets may also  be
less  liquid, more volatile  and less subject to  government supervision than in
the United States. Investments in foreign  countries could be affected by  other
factors   including   expropriation,   confiscatory   taxation   and   potential
difficulties in  enforcing  contractual  obligations and  could  be  subject  to
extended  settlement periods.  Each of  these Series  may hold  foreign currency
received in  connection with  investments  in foreign  securities when,  in  the
judgment  of the Adviser, it  would be beneficial to  convert such currency into
U.S. dollars  at a  later date,  based on  anticipated changes  in the  relevant
exchange  rate.  Each  of  these  Series  may  also  hold  foreign  currency  in
anticipation  of  purchasing  foreign  securities.  See  the  SAI  for   further
discussion of foreign securities and the holding of foreign currency, as well as
the associated risks.
 
AMERICAN  DEPOSITARY  RECEIPTS:  Each  Series  may  invest  in  ADRs,  which are
certificates issued  by a  U.S.  depository (usually  a  bank) and  represent  a
specified  quantity of shares of an underlying  non-U.S. stock on deposit with a
custodian bank as  collateral. Because  ADRs trade on  United States  securities
exchanges,  the Adviser does not treat them as foreign securities. However, they
are subject  to many  of the  risks of  foreign securities  such as  changes  in
exchange rates and more limited information about foreign issuers.
 
EMERGING  MARKETS SECURITIES:  Each Series  may invest  in emerging  markets. In
addition to the general risks of investing in foreign securities, investments in
emerging markets involve special risks.  Securities of many issuers in  emerging
markets  may  be less  liquid and  more volatile  than securities  of comparable
domestic issuers.  These securities  may be  considered speculative  and,  while
generally offering higher income and the potential for capital appreciation, may
present   significantly  greater  risk.  Emerging  markets  may  have  different
clearance and  settlement procedures,  and in  certain markets  there have  been
times  when  settlements  have been  unable  to  keep pace  with  the  volume of
securities transactions,  making  it  difficult to  conduct  such  transactions.
Delays  in settlement could  result in temporary  periods when a  portion of the
assets of  the  Series  is uninvested  and  no  return is  earned  thereon.  The
inability  of the Series  to make intended security  purchases due to settlement
problems could cause  the Series  to miss  attractive investment  opportunities.
Inability  to dispose of  portfolio securities due  to settlement problems could
result in  losses to  the Series  due to  subsequent declines  in value  of  the
portfolio  securities,  a  decrease  in  the level  of  liquidity  in  a Series'
portfolio, or if the Series  has entered into a  contract to sell the  security,
possible  liability to  the purchaser. Certain  markets may  require payment for
securities before delivery and in such markets the Series bear the risk that the
securities will  not be  delivered and  that the  Series' payments  will not  be
returned.  Securities  prices  in  emerging markets  can  be  significantly more
volatile than in the more developed nations of the world, reflecting the greater
uncertainties of  investing  in  less  established  markets  and  economies.  In
particular,  countries  with  emerging  markets  may  have  relatively  unstable
governments, present the risk of nationalization of businesses, restrictions  on
foreign  ownership, or prohibitions of repatriation of assets, and may have less
protection of property rights  than more developed  countries. The economies  of
countries  with  emerging  markets may  be  predominantly  based on  only  a few
industries, may  be  highly vulnerable  to  changes  in local  or  global  trade
conditions,  and may suffer from extreme  and volatile debt burdens or inflation
rates. Local securities markets may trade  a small number of securities and  may
be  unable to  respond effectively to  increases in  trading volume, potentially
making prompt liquidation  of substantial  holdings difficult  or impossible  at
times. Securities of issuers located in countries with emerging markets may have
limited marketability and may be subject to more abrupt or erratic movements.
 
                                       19
<PAGE>
Certain  emerging markets may require governmental approval for the repatriation
of investment income, capital or the proceeds of sales of securities by  foreign
investors.  In  addition,  if a  deterioration  occurs in  an  emerging market's
balance of  payments or  for other  reasons, a  country could  impose  temporary
restrictions  on  foreign capital  remittances.  The Series  could  be adversely
affected by delays in, or a refusal to grant, any required governmental approval
for repatriation of capital, as well as by the application to the Series of  any
restrictions on investments.
 
Investment in certain foreign emerging market debt obligations may be restricted
or  controlled to varying  degrees. These restrictions or  controls may at times
preclude investment  in certain  foreign emerging  market debt  obligations  and
increase the expenses of the Series.
 
NON-DIVERSIFICATION:  The World Governments Series  and the Utilities Series are
"non-diversified," as that term is defined in the Investment Company Act of 1940
(the "1940 Act"), but intends to qualify as a "regulated investment company" for
federal income tax purposes. This means, in general, that although more than  5%
of  each of these Series' total assets may  be invested in the securities of one
issuer (including a  foreign government), at  the close of  each quarter of  its
taxable  year the aggregate  amount of such  holdings may not  exceed 50% of the
value of its total assets, and no more than 25% of the value of its total assets
may be invested  in the  securities of  a single issuer.  To the  extent that  a
non-diversified  Series at times may hold the  securities of a smaller number of
issuers than if it were "diversified" (as defined in the 1940 Act), that  Series
will  at such  times be subject  to greater  risk with respect  to its portfolio
securities than a fund  that invests in a  broader range of securities,  because
changes  in the financial condition or market  assessment of a single issuer may
cause greater fluctuations in the Series'  total return and the net asset  value
of its shares.
                              -------------------
 
SHORT-TERM  INVESTMENTS FOR  TEMPORARY DEFENSIVE  PURPOSES --  During periods of
unusual market conditions when the Adviser believes that investing for temporary
defensive purposes is appropriate,  or in order  to meet anticipated  redemption
requests, a large portion or all of the assets of each Series may be invested in
cash (including foreign currency) or cash equivalents including, but not limited
to,   obligations  of   banks  (including  certificates   of  deposit,  bankers'
acceptances,  time  deposits  and  repurchase  agreements),  commercial   paper,
short-term notes, U.S. Government Securities and related repurchase agreements.
 
PORTFOLIO TRADING
 
Each Series intends to manage its portfolio by buying and selling securities, as
well as holding securities to maturity, to help attain its investment objectives
and policies.
 
Each  Series will engage in portfolio trading  if it believes a transaction, net
of costs (including custodian  charges), will help  in attaining its  investment
objectives. In trading portfolio securities, each Series seeks to take advantage
of market developments, yield disparities and variations in the creditworthiness
of  issuers. For  a description  of the  strategies which  may be  used by these
Series  in  trading  portfolio  securities,  see  "Portfolio  Transactions   and
Brokerage  Commissions" in the  SAI. The Total Return  Series' portfolio will be
managed actively with  respect to the  Series' fixed income  securities and  the
asset  allocations modified as the Adviser  deems necessary. Although the Series
does not  intend to  seek short-term  profits, fixed  income securities  in  its
portfolio  will be sold whenever the Adviser believes it is appropriate to do so
without regard to the length  of time the particular  asset may have been  held.
With  respect to its equity securities, the  Total Return Series does not intend
to trade in  securities for  short-term profits and  anticipates that  portfolio
securities  ordinarily will be held for one  year or longer. However, the Series
will effect trades whenever it believes that changes in its portfolio securities
are appropriate.
 
Because the World Governments  Series is expected to  have a portfolio  turnover
rate  of over 100%,  transaction costs incurred  by the Series  and the realized
capital gains and losses of the Series may be greater than that of a fund with a
lesser portfolio turnover rate.
 
The primary  consideration  in  placing  portfolio  security  transactions  with
broker-dealers  for execution  is to obtain,  and maintain  the availability of,
execution at  the  most  favorable  prices and  in  the  most  effective  manner
possible. Consistent with
 
                                       20
<PAGE>
the  foregoing primary consideration, the Rules of Fair Practice of the National
Association of Securities Dealers, Inc. (the "NASD") and such other policies  as
the Board of Trustees of the Trust may determine, the Adviser may consider sales
of Contracts for which the Trust is an investment option, together with sales of
shares  of other investment company clients  of MFS Fund Distributors, Inc., the
distributor of shares of the Trust and of  the MFS Family of Funds, as a  factor
in   the  selection  of   broker-dealers  to  execute   each  Series'  portfolio
transactions. From  time  to  time  the Adviser  may  direct  certain  portfolio
transactions to broker-dealer firms which, in turn, have agreed to pay a portion
of  the Series' operating  expenses (e.g. fees  charged by the  custodian of the
Series' assets). For a further discussion of portfolio trading, see the SAI.
                              -------------------
 
The SAI  includes a  discussion  of other  investment  policies and  listing  of
specific  investment restrictions which  govern the investment  policies of each
Series. The specific investment  restrictions listed in the  SAI may be  changed
without  shareholder  approval unless  indicated  otherwise (see  the  SAI). The
Series' investment limitations, policies and rating standards are adhered to  at
the  time  of  purchase  or  utilization  of  assets;  a  subsequent  change  in
circumstances will not be considered to result in a violation of policy.
 
7.  MANAGEMENT OF THE SERIES
 
The Trust's Board of Trustees, as part of its overall management responsibility,
oversees  various  organizations   responsible  for   each  Series'   day-to-day
management.
 
INVESTMENT ADVISER -- MFS manages each Series pursuant to an Investment Advisory
Agreement  with the  Trust on behalf  of each  Series dated April  14, 1994 (the
"Advisory Agreement"). MFS provides the Series with overall investment  advisory
and  administrative services, as  well as general  office facilities. Subject to
such policies as the Trustees may determine, MFS makes investment decisions  for
each  Series. For  its services and  facilities, MFS receives  a management fee,
computed and paid monthly, in an amount  equal to the following annual rates  of
the average daily net assets of each Series:
 
<TABLE>
<CAPTION>
                                                              PERCENTAGE OF THE
                                                              AVERAGE DAILY NET
                                                                   ASSETS
SERIES                                                         OF EACH SERIES
- ------------------------------------------------------------  -----------------
<S>                                                           <C>
Total Return Series.........................................        0.75%
Utilities Series............................................        0.75%
World Governments Series....................................        0.75%
</TABLE>
 
MFS  or its  affiliates will  pay a  fee to  Connecticut General  Life Insurance
Company ("CIGNA") equal, on an annualized  basis, to 0.10% of the aggregate  net
assets of the Series up to $100 million and 0.20% of the aggregate net assets of
the  Series  over $100  million attributable  to  Contracts offered  by separate
accounts of CIGNA or its  affiliates. Such fee will not  be paid by the  Series,
their shareholders or by Contract holders.
 
For  the  fiscal  year  ended  December 31,  1995,  MFS  received  the following
management fees from  the Series under  the Advisory Agreement  and assumed  the
following amounts of the Series' expenses (see "Expenses" below);
 
<TABLE>
<CAPTION>
                                                                                    MANAGEMENT FEE  EXPENSES ASSUMED
SERIES                                                                               PAID TO MFS         BY MFS
- ----------------------------------------------------------------------------------  --------------  ----------------
<S>                                                                                 <C>             <C>
Total Return Series...............................................................    $   10,826       $   25,092
Utilities Series..................................................................         9,376           25,513
World Governments Series..........................................................        33,869           43,311
</TABLE>
 
                                       21
<PAGE>
The  identity and  background of  the portfolio manager  for each  Series is set
forth below. Unless indicated otherwise each portfolio manager has acted in that
capacity since the commencement of investment operations of each Series.
 
<TABLE>
<CAPTION>
SERIES                                                           PORTFOLIO MANAGERS
- -----------------------------  --------------------------------------------------------------------------------------
<S>                            <C>
Total Return Series            David M. Calabro,  a Vice  President of MFS,  has been  employed by the  Adviser as  a
                               portfolio  manager since 1992.  Mr. Calabro is  the head of  this portfolio management
                               team and a manager of the common  stock portion of the Series' portfolio. Geoffrey  L.
                               Kurinsky,  a Senior  Vice President  of MFS,  has been  employed by  the Adviser  as a
                               portfolio manager since 1987. Mr. Kurinsky is the manager of the Series' fixed  income
                               securities.  Judith N. Lamb, a Vice President of MFS, has been employed by the Adviser
                               as a portfolio manager since 1992. Ms. Lamb is the manager of the Series'  convertible
                               securities.  Lisa B. Nurme, a Vice President of  MFS, has been employed by the Adviser
                               as a portfolio manager since 1987. Ms. Nurme is a manager of the common stock  portion
                               of  the Series'  portfolio. Maura A.  Shaughnessy, a  Vice President of  MFS, has been
                               employed by  the Adviser  as a  portfolio manager  since 1991.  Ms. Shaughnessy  is  a
                               manager of the common stock portion of the Series' portfolio. Each individual became a
                               portfolio manager of the Series on July 19, 1995.
Utilities Series               Maura  A.  Shaughnessy, a  Vice President  of the  Adviser, has  been employed  by the
                               Adviser as a portfolio manager since 1991.
World Governments Series       Stephen C. Bryant, a Senior  Vice President of the Adviser,  has been employed by  the
                               Adviser as a portfolio manager since 1987.
</TABLE>
 
MFS  also serves  as investment adviser  to each of  the other funds  in the MFS
Family of Funds  (the "MFS  Funds") and to  MFS-Registered Trademark-  Municipal
Income Trust, MFS Multimarket Income Trust, MFS Government Markets Income Trust,
MFS  Intermediate  Income Trust,  MFS Charter  Income  Trust, MFS  Special Value
Trust, MFS Institutional Trust,  MFS Union Standard  Trust, MFS/Sun Life  Series
Trust,  Sun Growth Variable Annuity Fund, Inc. and seven variable accounts, each
of which is a  registered investment company established  by Sun Life  Assurance
Company  of Canada (U.S.) ("Sun  Life of Canada (U.S.)")  in connection with the
sale of  various fixed/variable  annuity  contracts. MFS  and its  wholly  owned
subsidiary, MFS Asset Management, Inc., provide investment advice to substantial
private clients.
 
MFS  is  America's  oldest mutual  fund  organization. MFS  and  its predecessor
organizations have  a history  of  money management  dating  from 1924  and  the
founding  of the first mutual fund in the United States, Massachusetts Investors
Trust.  Net  assets  under   the  management  of   the  MFS  organization   were
approximately  $43.9  billion on  behalf of  approximately 1.9  million investor
accounts as of February 29, 1996. As of such date, the MFS organization  managed
approximately   $20  billion  of  assets   invested  in  equity  securities  and
approximately $20  billion  of  assets  invested  in  fixed  income  securities.
Approximately  $3.8  billion  of  the  assets managed  by  MFS  are  invested in
securities of foreign issuers and non-U.S. dollar-denominated securities of U.S.
issuers. MFS is a subsidiary  of Sun Life of Canada  (U.S.), which in turn is  a
wholly  owned subsidiary of  Sun Life Assurance Company  of Canada ("Sun Life").
The Directors of MFS are A. Keith  Brodkin, Jeffrey L. Shames, Arnold D.  Scott,
John  D. McNeil and John R. Gardner. Mr.  Brodkin is the Chairman, Mr. Shames is
the President  and  Mr. Scott  is  the Secretary  and  a Senior  Executive  Vice
President  of MFS.  Messrs. McNeil and  Gardner are the  Chairman and President,
respectively, of Sun Life. Sun Life, a mutual life insurance company, is one  of
the largest international life insurance companies and has been operating in the
United  States since 1895, establishing a  headquarters office here in 1973. The
executive officers of MFS report to the Chairman of Sun Life.
 
A. Keith  Brodkin, the  Chairman and  a Director  of MFS,  is the  Chairman  and
President  and a Trustee of the Trust. W. Thomas London, Stephen E. Cavan, James
R. Bordewick, Jr.,  and James  O. Yost,  all of whom  are officers  of MFS,  are
officers of the Trust.
 
                                       22
<PAGE>
MFS has established a strategic alliance with Foreign & Colonial Management Ltd.
("Foreign & Colonial"). Foreign & Colonial is a subsidiary of two of the world's
oldest  financial  services institutions,  the  London-based Foreign  & Colonial
Investment Trust PLC, which pioneered the idea of investment management in 1868,
and HYPO-BANK (Bayerische Hypotheken-und Weschsel-Bank AG), the oldest  publicly
listed bank in Germany, founded in 1835. As part of this alliance, the portfolio
managers  and investment analysts of MFS and Foreign & Colonial will share their
views on a variety of investment related issues, such as the economy, securities
markets, portfolio  securities and  their issuers,  investment  recommendations,
strategies and techniques, risk analysis, trading strategies and other portfolio
management  matters. MFS will have access  to the extensive international equity
investment expertise of  Foreign & Colonial,  and Foreign &  Colonial will  have
access to the extensive U.S. equity investment expertise of MFS. One or more MFS
investment  analysts are expected to work for  an extended period with Foreign &
Colonial's portfolio  managers  and  investment analysts  at  their  offices  in
London. In return, one or more Foreign & Colonial employees are expected to work
in a similar manner at MFS' Boston offices.
 
In  certain instances there may  be securities which are  suitable for a Series'
portfolio as  well as  for portfolios  of other  clients of  MFS or  clients  of
Foreign  & Colonial. Some simultaneous  transactions are inevitable when several
clients receive investment advice from MFS and Foreign & Colonial,  particularly
when the same security is suitable for more than one client. While in some cases
this arrangement could have a detrimental effect on the price or availability of
the  security as far as  a Series is concerned, in  other cases, however, it may
produce increased investment opportunities for the Series.
 
From time to time, the Adviser may  purchase, redeem and exchange shares of  any
Series. The purchase by the Adviser of shares of a Series may have the effect of
lowering  that Series'  expense ratio,  while the  redemption by  the Adviser of
shares of a Series may have the effect of increasing that Series' expense ratio.
 
DISTRIBUTOR -- MFS Fund Distributors, Inc. ("MFD"), a wholly owned subsidiary of
MFS, is the distributor of shares of each Series and also serves as  distributor
for certain of the other mutual funds managed by MFS.
 
SHAREHOLDER  SERVICING  AGENT  --  MFS Service  Center,  Inc.  (the "Shareholder
Servicing Agent"), a wholly owned  subsidiary of MFS, performs transfer  agency,
certain dividend disbursing agency and other services for each Series.
 
8.  INFORMATION CONCERNING SHARES OF EACH SERIES
 
PURCHASES AND REDEMPTIONS
 
The  separate accounts of the Participating  Insurance Companies place orders to
purchase and redeem  shares of  each Series based  on, among  other things,  the
amount of premium payments to be invested and surrender and transfer requests to
be  effected on that day pursuant to Contracts. Orders received by the Trust are
effected on days on which the Exchange is open for trading. For orders  received
by  the Trust before  the close of  regular trading on  the Exchange (normally 4
p.m. eastern standard  time), such purchases  and redemptions of  the shares  of
each Series are effected at the respective net asset values per share determined
as  of  the  close  of  regular  trading  on  the  Exchange  on  that  same day.
Participating Insurance Companies shall be the designee of the Trust for receipt
of purchase and  redemption orders  from Contract  holders and  receipt by  such
designee shall constitute receipt by the Trust; provided that the Trust receives
notice  of such order by  9:30 a.m. eastern standard  time on the next following
day on which the Exchange  is open for trading. Payment  for shares shall be  by
federal  funds transmitted  by wire  and must be  received by  2:00 p.m. eastern
standard time  on the  next following  day on  which the  Exchange is  open  for
trading  after the purchase  order is received. Redemption  proceeds shall be by
federal funds  transmitted  by wire  and  shall be  sent  by 2:00  p.m.  eastern
standard  time  on the  next following  day on  which the  Exchange is  open for
trading  after  the  redemption  order  is  received.  No  fee  is  charged  the
shareholders when they redeem Series shares.
 
The  offering of shares of any Series may  be suspended for a period of time and
each Series reserves the right to  refuse any specific purchase order.  Purchase
orders  may be  refused if, in  the Adviser's opinion,  they are of  a size that
would disrupt the management  of a Series.  The Trust may  suspend the right  of
redemption  of shares of any Series and may postpone payment for any period: (i)
during which the  Exchange is closed  other than customary  weekend and  holiday
closings  or during which trading  on the Exchange is  restricted; (ii) when the
SEC  determines   that   a   state   of  emergency   exists   which   may   make
 
                                       23
<PAGE>
payment  or transfer not reasonably  practicable; (iii) as the  SEC may by order
permit for the protection of the security  holders of the Trust; or (iv) at  any
time  when the Trust may, under  applicable laws, rules and regulations, suspend
payment on the redemption of its shares.
 
Should any conflict between  Contract holders arise which  would require that  a
substantial amount of net assets be withdrawn from any Series, orderly portfolio
management could be disrupted to the potential detriment of such Contract.
 
NET ASSET VALUE
 
The net asset value per share of each Series is determined each day during which
the  Exchange is open for  trading. This determination is  made once during each
such day as of  the close of  regular trading on the  Exchange by deducting  the
amount  of the  Series' liabilities  from the  value of  the Series'  assets and
dividing the  difference by  the number  of shares  of the  Series  outstanding.
Values  of assets in  a Series' portfolio  are determined on  the basis of their
market or other fair value as described in the SAI. All investments, assets  and
liabilities  are expressed in U.S. dollars  based upon current currency exchange
rates.
 
DISTRIBUTIONS
 
Substantially all of each Series' net investment income for any calendar year is
declared as dividends  and paid to  its shareholders as  dividends on an  annual
basis.  In addition, each Series  may make one or  more distributions during the
calendar year to its shareholders from any long-term capital gains, and may also
make one  or more  distributions  to its  shareholders from  short-term  capital
gains. In determining the net investment income available for distribution, each
of these Series may rely on projections of its anticipated net investment income
(which  may include  short-term capital  gains from  the sales  of securities or
other assets, and, if allowed by each of these Series' investment  restrictions,
premiums  from options written), over a longer  term, rather than its actual net
investment income for the period.
 
Shareholders of these  Series may elect  to receive dividends  and capital  gain
distributions in either cash or additional shares.
 
TAX STATUS
 
Each  Series of the Trust is treated as a separate entity for federal income tax
purposes. In order to minimize the taxes each Series would otherwise be required
to pay, each  Series intends  to qualify each  year as  a "regulated  investment
company"  under Subchapter M  of the Internal  Revenue Code of  1986, as amended
("the Code"), and to make distributions  to its shareholders in accordance  with
the  timing requirements imposed by the Code. It is not expected that any Series
will be required to pay entity level federal income or excise taxes.
 
Shares of the Series are offered only to the Participating Insurance  Companies'
separate  accounts that fund  Contracts. See the  applicable Contract prospectus
for a  discussion  of the  federal  income tax  treatment  of (1)  the  separate
accounts  that  purchase and  hold  Series shares  and  (2) the  holders  of the
Contracts  that  are  funded  through   those  accounts.  In  addition  to   the
diversification  requirements  of Subchapter  M of  the  Code, each  Series also
intends to diversify its assets as  required by Code Section 817(h)(1), and  the
regulations thereunder. See also "Tax Status" in the SAI.
 
DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
 
Each  Series of the Trust currently has  one class of shares, entitled Shares of
Beneficial Interest (without  par value). The  Trust has reserved  the right  to
create  and issue additional  classes and series  of shares, in  which case each
class of shares of a series would participate equally in the earnings, dividends
and assets attributable to  that class of  that particular series.  Shareholders
are  entitled to  one vote for  each share held,  and shares of  each Series are
entitled to vote separately to approve investment advisory agreements or changes
in investment restrictions with respect to that Series, but shares of all Series
vote together  in  the  election  of  Trustees  and  selection  of  accountants.
Additionally,  each Series will vote separately on any other matter that affects
solely that Series, but  will otherwise vote together  with all other Series  on
all  other  matters.  The  Trust  does not  intend  to  hold  annual shareholder
meetings. The Declaration of Trust provides  that a Trustee may be removed  from
office  in  certain instances.  See "Description  of  Shares, Voting  Rights and
Liabilities" in the SAI.
 
                                       24
<PAGE>
Each share of a Series represents an equal proportionate interest in the  Series
with  each other  share, subject  to the  liabilities of  the particular Series.
Shares have  no pre-emptive  or conversion  rights. Shares  are fully  paid  and
non-assessable.  Should  a Series  be liquidated,  shareholders are  entitled to
share PRO RATA  in the net  assets available for  distribution to  shareholders.
Shares  will  remain  on  deposit  with  the  Shareholder  Servicing  Agent  and
certificates will not be issued.
 
The Trust is an entity of the  type commonly known as a "Massachusetts  business
trust." Under Massachusetts law, shareholders of such a trust may, under certain
circumstances,  be  held  personally  liable as  partners  for  its obligations.
However, the  risk of  a  shareholder incurring  financial  loss on  account  of
shareholder  liability  is limited  to  circumstances in  which  both inadequate
insurance existed (E.G., fidelity bonding and omission insurance) and the  Trust
itself was unable to meet its obligations.
 
PERFORMANCE INFORMATION
 
Each  Series' performance  may be  quoted in advertising  in terms  of yield and
total return. Performance is based on historical results and is not intended  to
indicate future performance. Performance quoted for a Series includes the effect
of  deducting that  Series' expenses, but  may not include  charges and expenses
attributable to any particular insurance  product. Excluding these charges  from
quotations of a Series' performance has the effect of increasing the performance
quoted. Performance for a Series will vary based on, among other things, changes
in  market conditions, the level of interest  rates and the level of the Series'
expenses. For further information  about the Total  Return, Utilities and  World
Governments  Series' performance  for the fiscal  year ended  December 31, 1995,
please see the Series'  Annual Reports. A  copy of these  Annual Reports may  be
obtained by contacting your Participating Insurance Company.
 
From  time  to time,  quotations  of a  Series' total  return  and yield  may be
included in  advertisements,  sales literature  or  reports to  shareholders  or
prospective investors. The total return of a Series refers to return assuming an
investment  has been held  in the Series  for one year  and for the  life of the
Series (the ending date  of which will be  stated). The total return  quotations
may  be expressed in terms  of average annual or  cumulative rates of return for
all periods quoted.  Average annual total  return refers to  the average  annual
compound  rate of return of  an investment in a  Series. Cumulative total return
represents the cumulative  change in value  of an investment  in a Series.  Both
will  assume that all dividends and capital gains distributions were reinvested.
The yield of a Series refers to net investment income generated by a Series over
a specified 30-day (or one month) period. This income is then "annualized." That
is, the amount  of income generated  by the  Series during that  30-day (or  one
month)  period is assumed to be generated over a 12-month period and is shown as
a percentage of net asset value.
 
EXPENSES
 
The Trust pays the compensation of the Trustees who are not officers of MFS  and
all  expenses of each Series (other than those assumed by MFS) including but not
limited to: governmental fees; interest  charges; taxes; membership dues in  the
Investment  Company Institute  allocable to  each Series;  fees and  expenses of
independent auditors, of legal counsel, and of any transfer agent, registrar  or
dividend disbursing agent of each Series; expenses of repurchasing and redeeming
shares  and servicing shareholder accounts;  expenses of preparing, printing and
mailing  prospectuses,  periodic  reports,  notices  and  proxy  statements   to
shareholders  and to governmental officers  and commissions; brokerage and other
expenses connected with  the execution,  recording and  settlement of  portfolio
security transactions; insurance premiums; fees and expenses of Investors Bank &
Trust Company, the Trust's Custodian, for all services to each Series, including
safekeeping of funds and securities and maintaining required books and accounts;
expenses  of  calculating the  net asset  value  of shares  of each  Series; and
expenses  of   shareholder  meetings.   Expenses  relating   to  the   issuance,
registration  and qualification  of shares of  each Series  and the preparation,
printing and mailing of  prospectuses are borne by  each Series except that  the
Distribution  Agreement with MFD  requires MFD to  pay for printing prospectuses
that are to  be used for  sales purposes. Expenses  of the Trust  which are  not
attributable  to a specific Series are allocated  between the Series in a manner
believed by management of the Trust to be fair and equitable.
 
                                       25
<PAGE>
MFS has  agreed  to pay  until  December 31,  2004  the expenses  of  the  World
Governments  Series such  that the Series'  aggregate operating  expenses do not
exceed, on an annualized basis, 1.00% of its average daily net assets; provided,
however, that this obligation may  be terminated or revised  at any time by  MFS
without  the consent of the Trust or the Series by notice in writing from MFS to
the Trust  on  behalf  of the  Series.  Such  payments by  MFS  are  subject  to
reimbursement  by the World Governments Series which will be accomplished by the
payment by the Series of an expense  reimbursement fee to MFS computed and  paid
monthly  at a percentage  of its average  daily net assets  for its then current
fiscal year, with a limitation that immediately after such payment the aggregate
operating expenses of the Series would not exceed, on an annualized basis, 1.00%
of its average daily net assets. The expense reimbursement agreement  terminates
for  the World Governments Series  on the earlier of  the date on which payments
made thereunder  by the  Series equal  the prior  payment of  such  reimbursable
expenses by MFS or December 31, 2004.
 
MFS  has agreed  to pay  expenses of  each of  the Total  Return Series  and the
Utilities Series such that the  respective Series' aggregate operating  expenses
shall  not exceed, on an annualized basis, 1.00% of the average daily net assets
of the respective Series from November 2, 1994 through December 31, 1996,  1.25%
of  the average daily net  assets of the respective  Series from January 1, 1997
through December 31,  1998, and 1.50%  of the  average daily net  assets of  the
respective  Series from  January 1,  1999 through  December 31,  2004; provided,
however, that this obligation may  be terminated or revised  at any time by  MFS
without  the consent of the Trust or the Series by notice in writing from MFS to
the Trust  on  behalf  of the  Series.  Such  payments by  MFS  are  subject  to
reimbursement  by each Series which  will be accomplished by  the payment by the
Series of an expense  reimbursement fee to  MFS computed and  paid monthly at  a
percentage  of  the respective  Series' average  daily net  assets for  its then
current fiscal year, with a limitation  that immediately after such payment  the
aggregate  operating expenses of  the respective Series would  not exceed, on an
annualized basis, 1.00% of the average daily net assets of the respective Series
from November 2, 1994 through December 31, 1996, 1.25% of the average daily  net
assets  of the respective Series from January 1, 1997 through December 31, 1998,
and 1.50% of the average daily net assets of the respective Series from  January
1,  1999  through  December  31,  2004.  This  expense  reimbursement  agreement
terminates for each such  Series on the  earlier of the  date on which  payments
made  thereunder  by  the respective  Series  equal  the prior  payment  of such
reimbursable expenses by MFS or December 31, 2004.
 
SHAREHOLDER COMMUNICATIONS
 
Owners of Contracts issued by Participating Insurance Companies for which shares
of one  or  more  Series  are  the investment  vehicle  will  receive  from  the
Participating  Insurance Companies semi-annual  financial statements and audited
year-end financial  statements certified  by the  Trust's independent  certified
public accountants. Each report will show the investments owned by the Trust and
the  valuations thereof  as determined  by the  Trustees and  will provide other
information about the Trust and its operations.
 
Participating Insurance Companies  with inquiries regarding  the Trust may  call
the  Trust's Shareholder Servicing Agent. (See  back cover for address and phone
number.)
                              -------------------
 
The SAI for  the Trust, dated  May 1, 1996,  contains more detailed  information
about  each of the Series, including  information related to: (i) the investment
policies and  restrictions  of each  Series;  (ii) the  Trustees,  officers  and
investment  adviser of the Trust; (iii)  portfolio transactions; (iv) the shares
of each Series, including rights and liabilities of shareholders; (v) the method
used to calculate yield and total rate of return quotations of each Series; (vi)
the determination of net asset value of shares of each Series; and (vii) certain
voting rights of shareholders of each Series.
 
                                       26
<PAGE>
                                                                      APPENDIX A
 
                          DESCRIPTION OF BOND RATINGS
 
The  ratings  of Moody's,  S&P, and  Fitch  represent their  opinions as  to the
quality of  various debt  instruments. It  should be  emphasized, however,  that
ratings  are not absolute  standards of quality.  Consequently, debt instruments
with the same maturity, coupon and  rating may have different yields while  debt
instruments  of the same maturity and coupon with different ratings may have the
same yield.
 
                        MOODY'S INVESTORS SERVICE, INC.
 
AAA: Bonds which are rated Aaa are judged to be of the best quality. They  carry
the  smallest degree of investment  risk and are generally  referred to as "gilt
edged." Interest payments are protected by a large or by an exceptionally stable
margin and principal is secure. While the various protective elements are likely
to change, such changes  as can be  visualized are most  unlikely to impair  the
fundamentally strong position of such issues.
 
AA:  Bonds which are rated Aa are judged to be of high quality by all standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds. They are rated  lower than the best  bonds because margins of  protection
may  not be as large as in Aaa securities or fluctuations of protective elements
may be of greater amplitude  or there may be  other elements present which  make
the long-term risks appear somewhat larger than in Aaa securities.
 
A:  Bonds which are rated A possess many favorable investment attributes and are
to be considered as upper-medium-grade  obligations. Factors giving security  to
principal and interest are considered adequate but elements may be present which
suggest a susceptibility to impairment sometime in the future.
 
BAA:  Bonds  which are  rated Baa  are  considered as  medium-grade obligations,
(I.E., they are neither highly protected nor poorly secured). Interest  payments
and  principal security appear  adequate for the  present but certain protective
elements may be lacking or may  be characteristically unreliable over any  great
length  of time. Such  bonds lack outstanding  investment characteristics and in
fact have speculative characteristics as well.
 
BA: Bonds which  are rated  Ba are judged  to have  speculative elements;  their
future  cannot be considered  as well-assured. Often  the protection of interest
and principal payments  may be very  moderate and thereby  not well  safeguarded
during  both  good  and  bad  times over  the  future.  Uncertainty  of position
characterizes bonds in this class.
 
B: Bonds  which are  rated B  generally lack  characteristics of  the  desirable
investment.  Assurance of interest  and principal payments  or of maintenance of
other terms of the contract over any long period of time may be small.
 
CAA: Bonds which  are rated  Caa are  of poor standing.  Such issues  may be  in
default  or there may be present elements of danger with respect to principal or
interest.
 
CA: Bonds which are  rated Ca represent obligations  which are speculative in  a
high degree. Such issues are often in default or have other marked shortcomings.
 
C:  Bonds which are  rated C are the  lowest rated class of  bonds and issues so
rated can be regarded as having  extremely poor prospects of ever attaining  any
real investment standing.
 
ABSENCE  OF RATING: Where no rating has been assigned or where a rating has been
suspended or withdrawn, it may  be for reasons unrelated  to the quality of  the
issue.
 
Should no rating be assigned, the reason may be one of the following:
 
    1.  an application for rating was not received or accepted;
 
    2.   the issue or issuer belongs to  a group of securities or companies that
       are not rated as a matter of policy;
 
                                      A-1
<PAGE>
    3.  there is a lack of essential data pertaining to the issue or issuer; or
 
    4.   the  issue was  privately  placed, in  which  case the  rating  is  not
       published in Moody's publications.
 
Suspension  or withdrawal may occur if new and material circumstances arise, the
effects of which preclude satisfactory analysis; if there is no longer available
reasonable up-to-date data  to permit  a judgment  to be  formed; if  a bond  is
called for redemption; or for other reasons.
 
                       STANDARD & POOR'S RATINGS SERVICES
 
AAA:  Debt rated  AAA has the  highest rating  assigned by S&P.  Capacity to pay
interest and repay principal is extremely strong.
 
AA: Debt rated AA has a very strong capacity to pay interest and repay principal
and differs from the highest rated issues only in small degree.
 
A: Debt  rated A  has a  strong capacity  to pay  interest and  repay  principal
although  it is somewhat more  susceptible to the adverse  effects of changes in
circumstances and economic conditions than debt in higher-rated categories.
 
BBB: Debt rated BBB is regarded as  having an adequate capacity to pay  interest
and   repay  principal.   Whereas  it  normally   exhibits  adequate  protection
parameters, adverse  economic  conditions  or changing  circumstances  are  more
likely  to lead to a  weakened capacity to pay  interest and repay principal for
debt in this category than in higher-rated categories.
 
BB: Debt  rated  BB has  less  near-term  vulnerability to  default  than  other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse  business,  financial,  or  economic  conditions  which  could  lead  to
inadequate capacity  to meet  timely  interest and  principal payments.  The  BB
rating  category  is also  used for  debt  subordinated to  senior debt  that is
assigned an actual or implied BBB- rating.
 
B: Debt rated B  has a greater  vulnerability to default  but currently has  the
capacity  to meet interest payments  and principal repayments. Adverse business,
financial or economic conditions will  likely impair capacity or willingness  to
pay  interest and repay principal.  The B rating category  is also used for debt
subordinated to senior  debt that is  assigned an  actual or implied  BB or  BB-
rating.
 
CCC:  Debt rated CCC has a  currently identifiable vulnerability to default, and
is dependent upon favorable business, financial and economic conditions to  meet
timely  payment of interest and repayment of  principal. In the event of adverse
business, financial,  or economic  conditions,  it is  not  likely to  have  the
capacity  to pay interest and  repay principal. The CCC  rating category is also
used for debt subordinated to senior debt that is assigned an actual or  implied
B or B- rating.
 
CC:  The rating CC is typically applied to debt subordinated to senior debt that
is assigned an actual or implied CCC rating.
 
C: The rating C is typically applied  to debt subordinated to senior debt  which
is  assigned an actual or implied CCC- debt  rating. The C rating may be used to
cover a situation where a bankruptcy  petition has been filed, but debt  service
payments are continued.
 
CL:  The rating Cl  is reserved for income  bonds on which  no interest is being
paid.
 
D: Debt  rated D  is in  payment default.  The D  rating category  is used  when
interest payments or principal payments are not made on the date due even if the
applicable  grace period has not expired, unless S&P believes that such payments
will be made during such grace period. The  D rating also will be used upon  the
filing of a bankruptcy petition if debt service payments are jeopardized.
 
PLUS  (+)  OR MINUS  (-): The  ratings from  AA to  CCC may  be modified  by the
addition of a  plus or minus  sign to  show relative standing  within the  major
rating categories.
 
NR:  Indicates  that  no  public  rating  has  been  requested,  that  there  is
insufficient information on which to base a rating, or that S&P does not rate  a
particular type of obligation as a matter of policy.
 
                                      A-2
<PAGE>
A-1 AND P-1 COMMERCIAL PAPER RATINGS
 
Description of S&P, Moody's, and Fitch highest commercial paper ratings:
 
The rating "A" is the highest commercial paper rating assigned by S&P and Fitch,
and  issues so  rated are  regarded as having  the greatest  capacity for timely
payment. Issues in the "A" category are  delineated with the numbers 1, 2 and  3
to  indicate the relative  degree of safety. The  A-1 designation indicates that
the degree of  safety regarding timely  payment is either  overwhelming or  very
strong.   Those   A-1   issues  determined   to   possess   overwhelming  safety
characteristics will be denoted with a plus (+) sign designation.
 
The rating  P-1 is  the highest  commercial paper  rating assigned  by  Moody's.
Issuers  rated P-1 have a superior ability for repayment. P-1 repayment capacity
will normally be evidenced by the following characteristics: (1) leading  market
positions  in well  established industries;  (2) high  rates of  return on funds
employed; (3) conservative  capitalization structure with  moderate reliance  on
debt and ample asset protection; (4) broad margins in earnings coverage of fixed
financial  charges and high  internal cash generation;  and (5) well established
access to  a  range  of  financial markets  and  assured  sources  of  alternate
liquidity.
 
                         FITCH INVESTORS SERVICE, INC.
 
AAA:  Bonds considered to be investment grade and of the highest credit quality.
The obligor  has an  exceptionally  strong ability  to  pay interest  and  repay
principal, which is unlikely to be affected by reasonably foreseeable events.
 
AA: Bonds considered to be investment grade and of very high credit quality. The
obligor's  ability to pay interest and  repay principal is very strong, although
not quite as strong as bonds rated  'AAA'. Because bonds rated in the 'AAA'  and
'AA'   categories  are  not  significantly   vulnerable  to  foreseeable  future
developments, short-term debt of these issuers is generally rated 'F-1+'.
 
A: Bonds considered to be investment grade and of very high credit quality.  The
obligor's  ability  to pay  interest  and repay  principal  is considered  to be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings.
 
BBB: Bonds considered to be investment grade and of satisfactory credit quality.
The obligor's ability to  pay interest and repay  principal is considered to  be
adequate. Adverse changes in economic conditions and circumstances, however, are
more  likely to have adverse  impact on these bonds  and therefore impair timely
payment. The  likelihood  that  the  ratings of  these  bonds  will  fall  below
investment grade is higher than for bonds with higher ratings.
 
BB:  Bonds are considered speculative. The obligor's ability to pay interest and
repay principal may be affected over time by adverse economic changes.  However,
business  and financial  alternatives can be  identified which  could assist the
obligor in satisfying its debt service requirements.
 
B: Bonds  are considered  highly  speculative. While  bonds  in this  class  are
currently meeting debt service requirements, the probability of continued timely
payment  of  principal and  interest reflects  the  obligor's limited  margin of
safety and the need for reasonable business and economic activity throughout the
life of the issue.
 
CCC: Bonds have certain identifiable characteristics which, if not remedied, may
lead to  default.  The ability  to  meet obligations  requires  an  advantageous
business and economic environment.
 
CC:  Bonds  are  minimally  protected. Default  in  payment  of  interest and/or
principal seems probable over time.
 
C: Bonds are in imminent default in payment of interest or principal.
 
PLUS(+) MINUS(-): Plus and minus signs are used with a rating symbol to indicate
the relative position  of a  credit within the  rated category.  Plus and  minus
signs, however, are not used in the 'AAA' category.
 
NR: indicates that Fitch does not rate the specific issue.
 
                                      A-3
<PAGE>
CONDITIONAL:  A conditional rating is premised on the successful completion of a
project or the occurrence of a specific event.
 
SUSPENDED: A rating  is suspended  when Fitch  deems the  amount of  information
available from the issuer to be inadequate for rating purposes.
 
WITHDRAWN:  A rating  will be withdrawn  when an  issue matures or  is called or
refinanced, and, at Fitch's discretion, when  an issuer fails to furnish  proper
and timely information.
 
FITCHALERT:  Ratings  are  placed  on  FitchAlert  to  notify  investors  of  an
occurrence that is likely to result in a rating change and the likely  direction
of  such  change.  These are  designated  a "Positive,"  indicating  a potential
upgrade, "Negative," for potential downgrade,  or "Evolving," where ratings  may
be lowered. FitchAlert is relatively short-term and should be resolved within 12
months.
 
                                      A-4
<PAGE>
                                                                      APPENDIX B
 
                  PRINCIPAL SECTORS OF THE UTILITIES INDUSTRY
 
The  principal sectors of the utility industry in which the Utilities Series may
invest are discussed below.
 
ELECTRIC -- The electric utility industry consists of companies that are engaged
principally in  the  generation,  transmission  and  sale  of  electric  energy,
although  many  also provide  other  energy-related services.  Domestic electric
utility companies, in general,  recently have been  favorably affected by  lower
fuel  and financing costs and the full  or near completion of major construction
programs. In  addition, many  of these  companies recently  have generated  cash
flows  in excess  of current  operating expenses  and construction expenditures,
permitting some  degree of  diversification  into unregulated  businesses.  Some
electric  utilities have also taken advantage of the right to sell power outside
of their traditional geographic  areas. Electric utility companies  historically
have  been subject  to the  risks associated  with increases  in fuel  and other
operating  costs,  high  interest  costs   on  borrowings  needed  for   capital
construction  programs, costs associated with  compliance with environmental and
safety regulations and changes in the regulatory climate.
 
In the  U.S., the  construction and  operation of  nuclear power  facilities  is
subject  to  increased scrutiny  by, and  evolving  regulations of,  the Nuclear
Regulatory  Commission  and  state  agencies  having  comparable   jurisdiction.
Increased  scrutiny might  result in higher  operating costs  and higher capital
expenditures, with the risk that the regulators may disallow inclusion of  these
costs  in rate authorizations or the risk that a company may not be permitted to
operate or  complete  construction of  a  facility. In  addition,  operators  of
nuclear power plants may be subject to significant costs for disposal of nuclear
fuel and for the de-commissioning of such plants.
 
TELECOMMUNICATIONS  -- The telephone industry  is large and highly concentrated.
Companies that distribute telephone services and provide access to the telephone
networks comprise the greatest portion  of this segment. Telephone companies  in
the U.S. are still experiencing the effects of the breakup of American Telephone
&  Telegraph Company, which  occurred in 1984. Since  1984, companies engaged in
telephone communication services  have expanded  their non-regulated  activities
into  other businesses, including cellular  telephone services, data processing,
equipment retailing,  computer software  and  hardware services,  and  financial
services.  This  expansion has  provided  significant opportunities  for certain
telephone companies to  increase their  earnings and dividends  at faster  rates
than   had  been  allowed  in  traditionally  regulated  businesses.  Increasing
competition, technological innovations  and other  structural changes,  however,
could adversely affect the profitability of such utilities.
 
GAS  --  Gas  transmission companies  and  gas distribution  companies  are also
undergoing significant changes. In  the U.S., interstate transmission  companies
are regulated by the Federal Energy Regulatory Commission, which is reducing its
regulation  of the  industry. Many companies  have diversified into  oil and gas
exploration and development, making returns more sensitive to energy prices.  In
the  recent  decade,  gas  utility companies  have  been  adversely  affected by
disruptions in  the  oil industry  and  have  also been  affected  by  increased
concentration   and  competition.  In  the  opinion  of  the  Adviser,  however,
environmental considerations  could  improve the  gas  industry outlook  in  the
future.  For example, natural gas is the  cleanest of the hydrocarbon fuels, and
this may result in incremental shifts in fuel consumption toward natural gas and
away from oil and coal.
 
WATER -- Water supply utilities  are companies that collect, purify,  distribute
and  sell  water. In  the  U.S. and  around the  world,  the industry  is highly
fragmented because  most  of  the  supplies  are  owned  by  local  authorities.
Companies  in this industry are generally  mature and are experiencing little or
no per capita volume growth.
 
                              -------------------
 
There can be no assurance that the positive developments noted above,  including
those  relating to  changing regulation, will  occur or that  risk factors other
than those noted above will not develop in the future.
 
                                      B-1
<PAGE>
INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(800)-637-8730
 
DISTRIBUTOR
MFS Fund Distributors, Inc.
500 Boylston Street, Boston, MA 02116
CUSTODIAN
Investors Bank & Trust Company
89 South Street, Boston, MA 02111
 
DIVIDEND DISBURSING AGENT
State Street Bank and Trust Company
225 Franklin Street, Boston, MA 02110
 
SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: (800) 637-8730
MAILING ADDRESS:
P.O. Box 1400, Boston, MA 02104-9985
For additional information,
contact your financial adviser.
INDEPENDENT AUDITORS
Deloitte & Touche LLP
125 Summer Street, Boston, MA 02110
 
                                     [LOGO]
 
               MFS-REGISTERED TRADEMARK- TOTAL RETURN SERIES-SM-
                 MFS-REGISTERED TRADEMARK- UTILITIES SERIES-SM-
             MFS-REGISTERED TRADEMARK- WORLD GOVERNMENTS SERIES-SM-
 
                     500 Boylston Street, Boston, MA 02116
 
                      ------------------------------------
 
                           MFS-REGISTERED TRADEMARK-
                                  TOTAL RETURN
                                   SERIES-SM-
                 MFS-REGISTERED TRADEMARK- UTILITIES SERIES-SM-
                        MFS-REGISTERED TRADEMARK- WORLD
                             GOVERNMENTS SERIES-SM-
 
                                     [LOGO]
                                   PROSPECTUS
 
                                  MAY 1, 1996
 
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