MFS SUN LIFE SERIES TRUST
PRE 14A, 1996-03-26
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                                  SCHEDULE 14A
                                 (Rule 14a-101)
 
                   INFORMATION REQUIRED IN PROXY STATEMENT

                          SCHEDULE 14A INFORMATION
                Proxy Statement Pursuant to Section 14(a) of the
                       Securities Exchange Act of 1934
 
    Check the appropriate box:
    /X/  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only 
         (as permitted by Rule 14a-6(e)(2))
    / /  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting  Material  Pursuant to Rule 14a-11(c) or Rule 14a-12
 

                         MFS/SUN LIFE SERIES TRUST
                (Name of Registrant as Specified in its Charter)
 

    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
               PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):
 
/X/  $125 per Exchange Act Rules 0-11(c)(1)(ii),  14a-6(i)(1), 14a-6(i)(2)
     or Item 22(a)(2).
/ /  $500  per each party to the controversy pursuant to Exchange Act
     Rule 14a-6(i)(3).
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

(1)  Title of each class of securities to which transaction applies:

     N/A
     ------------------------------------------------------------------------

(2)  Aggregate number of securities to which transaction applies:

     N/A
     ------------------------------------------------------------------------
(3)  Per unit price or other underlying value of transaction computed
     pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
     filing fee is calculated and state how it was determined):

     N/A
     ------------------------------------------------------------------------

(4)  Proposed maximum aggregate value of transaction:

     N/A
     ------------------------------------------------------------------------


(5)  Total fee paid:

     N/A
     ------------------------------------------------------------------------

/ /  Fee paid previously with preliminary materials.

/ /  Check box if any part of the fee is offset as provided by Exchange Act
     Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
     paid previously. Identify the previous filing by registration
     statement number, or the Form or Schedule and the date of its filing:

(1)  Amount Previously Paid:

     N/A
     ------------------------------------------------------------------------

(2)  Form, Schedule or Registration Statement No.:

     N/A
     ------------------------------------------------------------------------

(3)  Filing Party:

     N/A
     ------------------------------------------------------------------------

(4)  Date Filed:

     N/A
     ------------------------------------------------------------------------
<PAGE>
                           MFS/SUN LIFE SERIES TRUST
                              WORLD GROWTH SERIES
                500 Boylston Street, Boston, Massachusetts 02116
 
                      ------------------------------------
 
                       Notice of Meeting of Shareholders
                           To be held April 29, 1996
 
A  Meeting of  Shareholders of  the World Growth  Series of  MFS/Sun Life Series
Trust (the "Fund") will be held at the offices of Sun Life Assurance Company  of
Canada,  One Sun Life Executive Park, Wellesley Hills, Massachusetts, on Monday,
April 29, 1996 at 9:30 a.m. for the following purposes:
 
ITEM 1.  To approve  two new  Sub-Investment  Advisory Agreements,  one  between
         Massachusetts Financial Services Company ("MFS") and Foreign & Colonial
         Management   Limited  ("FCM"),  and  the  other  between  FCM  and  its
         subsidiary, Foreign  &  Colonial  Emerging  Markets  Limited  ("FCEM"),
         containing  substantially the same terms  and conditions as the current
         Sub-Investment  Advisory   Agreement  between   MFS  and   Batterymarch
         Financial  Management, Inc. ("Batterymarch"), to become effective on or
         about May 1, 1996.
 
ITEM 2.  To transact  such other  business as  may come  before the  Meeting  of
         Shareholders and any adjournments thereof.
 
       THE BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE IN FAVOR OF ITEM 1.
 
    Only  shareholders of record on  March 25, 1996 will  be entitled to vote at
the Meeting of Shareholders and at any adjournments thereof.
 
                                            BONNIE S. ANGUS, Secretary and Clerk
 
Wellesley Hills, Massachusetts
April 3, 1996
<PAGE>
            PROXY STATEMENT FOR MEETING TO BE HELD ON APRIL 29, 1996
 
    This proxy statement  is furnished  in connection with  the solicitation  of
proxies  by and on behalf of the Board  of Trustees of MFS/Sun Life Series Trust
(the "Trust") to be  used at a  Meeting of Shareholders  (the "Meeting") of  the
World  Growth Series  ("WGS") to be  held in  the offices of  Sun Life Assurance
Company of Canada, One Sun  Life Executive Park, Wellesley Hills,  Massachusetts
02181  on April 29, 1996  at 9:30 a.m., and at  any adjournment thereof, for the
purposes set forth in the accompanying  Notice of Meeting. If the enclosed  form
of  proxy is executed and returned, it  may nevertheless be revoked prior to its
exercise by a signed writing filed with the Secretary of the Trust or  delivered
at  the Meeting. Shareholders  of record at  the close of  business on March 25,
1996 will be  entitled to one  vote for each  share held. As  of March 25,  1996
there  were [to come] shares  of beneficial interest of  WGS outstanding, all of
which were owned of record by Sun Life Assurance Company of Canada (U.S.)  ("Sun
Life  (U.S.)") and Sun Life Insurance and Annuity Company of New York ("Sun Life
(N.Y.)") and held in Sun Life of  Canada (U.S.) Variable Account F and Sun  Life
(N.Y.)   Variable  Account  C  (the   "Variable  Accounts"),  separate  accounts
established to fund benefits under variable contracts issued by Sun Life  (U.S.)
and  Sun Life  (N.Y.), respectively.  Sun Life (U.S.)  and Sun  Life (N.Y.) will
solicit voting instructions with respect to shares held by the Variable Accounts
from  owners  of   and  participants   and  payees   under  variable   contracts
participating  in the investment experience of the Variable Accounts. All shares
of WGS held by each Variable Account  will be voted. Shares for which no  timely
voting  instructions are received will be voted in the same proportion as shares
for which instructions are received from persons having such right.
 
The mailing address of the Trust  is 500 Boylston Street, Boston,  Massachusetts
02116.  Solicitation of proxies is being made  by the mailing of this Notice and
proxy statement  with its  enclosures on  or about  April 3,  1996. All  of  the
expenses of the solicitation will be borne by the Trust.
 
The  Trust has mailed  to its Shareholders  copies of its  Annual Report for the
fiscal year ended December 31,  1995 containing financial statements  reflecting
the  financial position and operations of the Trust for such fiscal year. A copy
of the Annual Report may be obtained  without charge by contacting the Sun  Life
Annuity  Service Center  at P.O.  Box 1024,  Boston, MA  02103-9986 or telephone
toll-free at (800) 752-7215.
 
ITEM 1--TO  APPROVE  TWO NEW  SUB-INVESTMENT  ADVISORY AGREEMENTS,  ONE  BETWEEN
MASSACHUSETTS   FINANCIAL  SERVICES  COMPANY  ("MFS")  AND  FOREIGN  &  COLONIAL
MANAGEMENT LIMITED  ("FCM"),  AND THE  OTHER  BETWEEN FCM  AND  ITS  SUBSIDIARY,
FOREIGN  & COLONIAL EMERGING MARKETS  LIMITED, CONTAINING SUBSTANTIALLY THE SAME
TERMS AND CONDITIONS  AS THE CURRENT  SUB-INVESTMENT ADVISORY AGREEMENT  BETWEEN
MFS AND BATTERYMARCH FINANCIAL MANAGEMENT, INC., TO BECOME EFFECTIVE ON OR ABOUT
MAY 1, 1996.
 
THE  BOARD OF TRUSTEES RECOMMENDS THAT SHAREHOLDERS  OF THE FUND APPROVE THE NEW
SUB-INVESTMENT ADVISORY AGREEMENTS.
 
BACKGROUND AND SUMMARY
 
    Massachusetts Financial Services Company ("MFS" or the "Adviser") serves  as
WGS's  investment adviser and provides WGS  with overall investment advisory and
administrative services, as well as general office facilities. MFS manages WGS's
assets invested  in U.S.  markets,  and has  engaged two  sub-advisers,  Oechsle
International  Advisors, L.P. ("Oechsle") and Batterymarch Financial Management,
Inc. ("Batterymarch"),  to  manage WGS's  assets  invested in  foreign  markets.
Oechsle  manages WGS's  assets invested  in developed  foreign markets,  such as
Western Europe, Japan, Australia and New Zealand, and Batterymarch manages WGS's
assets invested in emerging markets, such  as Latin America and the Pacific  Rim
(excluding Japan).
 
                                       1
<PAGE>
At  December 31, 1995, WGS's net assets  were $146,388,233 and the net assets of
the sub-portfolios  of  WGS  managed  by  MFS,  Oechsle  and  Batterymarch  were
$69,382,966, $52,970,805 and $24,034,462, respectively.
 
The  Board of Trustees has approved the  termination by MFS of Batterymarch as a
sub-adviser to WGS  and the retention  by MFS of  Foreign & Colonial  Management
Limited  ("FCM")  and of  its subsidiary,  Foreign  & Colonial  Emerging Markets
Limited ("FCEM"), as new sub-advisers to WGS to replace Batterymarch. Under this
arrangement, FCM  and FCEM  would  commence managing  WGS's assets  invested  in
emerging markets on or about May 1, 1996. FCM and FCEM are described below under
the  caption "Description  of FCM and  FCEM; Strategic Alliance  Between MFS and
FCM."
 
At  the  Meeting,  shareholders  of  WGS  will  be  asked  to  approve  two  new
Sub-Investment  Advisory  Agreements, one  between MFS  and  FCM, and  the other
between FCM  and  FCEM  (the  "New  Sub-Investment  Advisory  Agreements").  The
proposed  New Sub-Investment Advisory Agreements  are substantially identical to
the Sub-Investment Advisory Agreement between MFS and Batterymarch dated January
5,  1995  and  currently  in   effect  (the  "Current  Sub-Investment   Advisory
Agreement"). A description of the New Sub-Investment Advisory Agreements and the
services  to be provided by FCM and FCEM thereunder is set forth below under the
caption "Description of the New Sub-Investment Advisory Agreements."
 
Approval of the new Sub-Investment Advisory Agreements would have no effect upon
the amount of management fees paid by WGS to MFS. MFS, not WGS, pays  management
fees to the sub-advisers, and FCM and FCEM would receive from MFS the same level
of compensation MFS currently pays Batterymarch.
 
DESCRIPTION OF MFS AND BATTERYMARCH
 
    MFS,  a  Delaware  corporation  located  at  500  Boylston  Street,  Boston,
Massachusetts 02116,  manages  the  assets  of WGS  pursuant  to  an  Investment
Advisory  Agreement,  dated November  1,  1993 (the  "Advisory  Agreement"). The
Adviser  provides  WGS  with  overall  investment  advisory  and  administrative
services,  as well as general office facilities. Subject to such policies as the
Board of Trustees may determine, the Adviser makes investment decisions for WGS.
For these  services  and facilities,  MFS  receives  a fee,  computed  and  paid
monthly, at an annual rate equal to 0.90% of the average daily net assets of WGS
for  WGS's then-current fiscal year. The total management fee paid by WGS to the
Adviser under the Investment Advisory  Agreement during WGS's fiscal year  ended
December  31, 1995 was $1,090,977. MFS has  also undertaken to reimburse WGS for
aggregate expenses, excluding taxes, extraordinary expenses and brokerage costs,
in excess of 1.50% of the average daily net assets of WGS for the fiscal year.
 
Batterymarch, a Maryland  corporation located at  200 Clarendon Street,  Boston,
Massachusetts  02116, is  a registered  investment adviser  that acts  as one of
WGS's  two  sub-advisers  pursuant   to  the  Current  Sub-Investment   Advisory
Agreement.  The  Current  Sub-Investment Advisory  Agreement  was  most recently
approved by the Board  of Trustees, including  all of the  Trustees who are  not
"interested  persons,"  as defined  in the  Investment Company  Act of  1940, as
amended (the "1940 Act"),  of any party to  the Current Sub-Investment  Advisory
Agreement  (collectively, the "Independent Trustees"),  on November 1, 1995, and
was approved by WGS's shareholders on December 29, 1994, in connection with  the
acquisition of the predecessor to Batterymarch by Legg Mason, Inc.
 
Under  the Current Sub-Investment Advisory  Agreement, the Adviser has delegated
to Batterymarch the authority to make investment decisions with respect to  that
portion  of WGS's assets as the Adviser  shall from time to time designate. This
delegation is  subject to  oversight by  the Adviser  and determinations  as  to
investment  policy by the  Board of Trustees.  Batterymarch manages WGS's assets
which the  Adviser  has  designated  for investment  in  emerging  countries  or
regions.  For its  services, the Adviser  (not WGS) pays  Batterymarch an annual
management   fee,   computed   and   paid   monthly,   in   an   amount    equal
 
                                       2
<PAGE>
to  1.00% on an annualized  basis of the average daily  net asset value of WGS's
assets managed by Batterymarch. The total management fee paid by the Adviser  to
Batterymarch  under the  Current Sub-Investment Advisory  Agreement during WGS's
fiscal year ended December 31, 1995 was $206,294.
 
DESCRIPTION OF FCM AND FCEM; STRATEGIC ALLIANCE BETWEEN MFS AND FCM
 
    DESCRIPTION OF FCM AND  FCEM. FCM and FCEM  are both companies  incorporated
under  the laws of England and Wales and are located at Exchange House, Primrose
Street, London EC2A  2NY, United Kingdom.  FCM is a  wholly owned subsidiary  of
Hypo  Foreign & Colonial Management (Holdings)  Ltd. ("Hypo F&C"). Fifty percent
of the  outstanding voting  securities  of Hypo  F&C is  owned  by each  of  (i)
Pountney  Hill  Holdings  Limited, which  is  wholly owned  by  five closed-end,
publicly listed investment trusts managed  by FCM, including Foreign &  Colonial
Investment  Trust PLC,  and (ii)  Hypo (U.K.) Holdings  Ltd., which  is a wholly
owned subsidiary of HYPO-BANK  (Bayerische Hypotheken-und Wechsel-Bank AG),  the
oldest  publicly listed, and fifth largest,  commercial bank in Germany, founded
in 1835.  FCM  has a  history  of money  management  dating from  1868  and  the
establishment  of  the  world's  oldest  closed-end  fund,  Foreign  &  Colonial
Investment Trust PLC. As  of December 31, 1995,  FCM managed approximately  U.S.
$19.1 billion of assets, including approximately U.S. $12.6 billion of assets in
equity  securities and approximately U.S. $6.5 billion of assets in fixed income
securities.
 
FCEM is a wholly owned subsidiary of FCEM (HOLDINGS) Limited ("FCEM  Holdings").
FCEM Holdings is a subsidiary of FCM, which owns 75.1% of the outstanding voting
securities of FCEM Holdings. Garantia Banking Limited, a wholly owned subsidiary
of  Banco  de Investimentos  Garantia SA  located at  Rua Jorge  Coelho, 16-13th
Floor, CEP 01451-020, Sao  Paulo, Brazil, owns 14.9%  of the outstanding  voting
securities  of FCEM  Holdings, and Audley  William Twiston  Davies, the Managing
Director of  FCEM,  owns  10%  of the  outstanding  voting  securities  of  FCEM
Holdings.  FCEM manages emerging  market investments for FCM  and FCEM serves as
the investment adviser to  public closed-end and  open-end funds and  segregated
accounts specializing in emerging markets. As of December 31, 1995, FCEM managed
approximately U.S. $3.4 billion of assets invested in emerging markets.
 
The  name, address and  principal occupation of  the principal executive officer
and each director of FCM and FCEM are set forth in Appendix A. The size and  the
rate  of FCM's and FCEM's investment advisory compensation with respect to other
U.S. registered investment  companies having a  similar investment objective  to
WGS advised by FCM and FCEM are set forth in Appendix B.
 
STRATEGIC  ALLIANCE  BETWEEN  MFS AND  FCM.  MFS  and FCM  have  entered  into a
strategic  alliance  pursuant  to  which  they  have  agreed  to  cooperate   in
distributing, advising and managing investment products throughout the world. In
this  arrangement certain  expenses and  revenues relating  to their cooperative
activities, including, if Item I is approved by shareholders of WGS,  investment
advisory  fees received from WGS  and certain expenses incurred  by MFS, FCM and
their affiliates attributable to their services  to WGS, are shared. As part  of
this  alliance, the  portfolio managers and  investment analysts of  MFS and FCM
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  has  access  to  the extensive
international equity investment  expertise of  FCM, and  FCM has  access to  the
extensive  U.S. equity investment expertise of  MFS. MFS investment analysts are
working for  an  extended period  with  FCM portfolio  managers  and  investment
analysts  at their offices in  London. In return, one  or more FCM employees are
expected to work in a similar manner at MFS' Boston offices.
 
In certain  instances there  may  be securities  which  are suitable  for  WGS's
portfolio  as well as for portfolios of other  clients of MFS or clients of FCM.
Some simultaneous  transactions  are  inevitable when  several  clients  receive
investment  advice  from MFS  and FCM,  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
WGS   is  concerned,  in  other  cases   it  may  produce  increased  investment
opportunities for WGS.
 
                                       3
<PAGE>
PROPOSED SUBSTITUTION OF FCM AND FCEM FOR BATTERYMARCH
 
    MFS has  exercised  its  right under  the  Current  Sub-Investment  Advisory
Agreement  with Batterymarch to  terminate that Agreement  effective on or about
May 1, 1996. However, the termination of that Agreement is conditioned upon  the
approval  by  WGS's shareholders  of  the proposed  New  Sub-Investment Advisory
Agreements with FCM and FCEM, which if  so approved will become effective on  or
about  May  1,  1996. If  the  New  Sub-Investment Advisory  Agreements  are not
approved  by  WGS's  shareholders,  Batterymarch  will  continue  to  serve   as
sub-adviser  to WGS  pursuant to  the Current  Sub-Investment Advisory Agreement
pending  consideration  by  MFS  and  the  Board  of  Trustees,  including   the
Independent  Trustees, of what  further action, if  any, should be  taken in the
best interests of shareholders.
 
As discussed  more  fully  below  under the  caption  "Description  of  the  New
Sub-Investment   Advisory   Agreements,"   the  terms   of   the   proposed  New
Sub-Investment Advisory Agreements  are substantially identical  to the  Current
Sub-Investment  Advisory  Agreement. Under  the Current  Sub-Investment Advisory
Agreement, Batterymarch receives a sub-investment  management fee from MFS  (not
from  WGS) equal to 1.00% per annum of  the average daily net asset value of the
assets of  WGS  managed  by  Batterymarch.  Likewise,  under  the  proposed  New
Sub-Investment  Advisory  Agreement between  MFS and  FCM,  FCM would  receive a
sub-investment management fee from MFS (not  from WGS) equal to 1.00% per  annum
of  the average daily net asset  value of the assets of  WGS managed by FCM. FCM
would, in turn, pay the sub-investment management fee it receives from MFS  over
to  FCEM, as the proposed New  Sub-Investment Advisory Agreement between FCM and
FCEM provides that FCEM would receive  a sub-investment management fee from  FCM
(not  from WGS or MFS) equal  to 1.00% per annum of  the average daily net asset
value of the assets of WGS managed by FCEM.
 
In  addition  to  receiving   this  cash  compensation,   FCM  and  FCEM,   like
Batterymarch, would receive certain benefits from placing portfolio transactions
on behalf of WGS. The initial criterion FCM and FCEM apply in selecting a broker
to  effect a securities transaction for  their respective clients is whether the
broker can  provide  the  best  price and  execution  for  the  transaction.  In
accordance  with Section 28(e) of the  Securities Exchange Act of 1934, however,
FCM and  FCEM may  from time  to time  select as  brokers for  their  respective
clients  those firms that furnish research  services to them. These services are
generally defined as those  providing lawful and  appropriate assistance to  FCM
and   FCEM   in   the   performance   of   their   investment   decision  making
responsibilities. Among the  specific kinds  of research services  that FCM  and
FCEM  may  receive from  brokers are  fundamental analysis  of the  economy, the
political environment, the financial markets, individual companies and  specific
industries  and  technical analysis  of  individual securities.  In  following a
policy of selecting brokers furnishing research  services, FCM and FCEM may  pay
commissions  higher than those obtainable from  other brokers who do not provide
such services. FCM and FCEM will use the research they obtain to service all the
accounts they manage and use no formal procedures to direct client  transactions
to a particular broker in return for products and research services received.
 
Joseph  C. Williams  is currently  the portfolio manager  for the  assets of WGS
allocated to Batterymarch.  Mr. Williams leads  the emerging markets  investment
activities of Batterymarch and has been a portfolio manager with the predecessor
of  Batterymarch since 1994. Prior to  joining Batterymarch, Mr. Williams served
as a director at Morgan Grenfell Investment Services in London.
 
If the  Fund's shareholders  approve the  proposed New  Sub-Investment  Advisory
Agreements,  it is  anticipated that Dr.  Arnab Kumar  Banerji, Chief Investment
Officer of  FCEM,  will become  the  portfolio manager  for  the assets  of  WGS
allocated  to FCM  and FCEM. Dr.  Banerji has  been employed by  FCEM since 1993
before which he  served as Joint  Head of Emerging  Markets for Citibank  Global
Asset Management since 1989.
 
RECOMMENDATION OF THE BOARD OF TRUSTEES
 
    The  Board of Trustees approved of  the proposed New Sub-Investment Advisory
Agreements at a meeting held on January 25, 1996. Prior to this meeting, MFS had
discussed with the  Board of Trustees  its analysis that  FCM and FCEM  achieved
superior
 
                                       4
<PAGE>
investment  performance in  the management  of emerging  market investments. MFS
informed the Board  of Trustees at  a meeting held  on November 1,  1995 of  its
intention   to  recommend  that   the  Board  of   Trustees  consider  replacing
Batterymarch with FCM  and FCEM.  Before approving these  Agreements, the  Board
reviewed  and discussed with  representatives of MFS  materials furnished by MFS
and  FCM,  including  drafts  of   the  proposed  New  Sub-Investment   Advisory
Agreements;  background  information  concerning  FCM  and  FCEM  covering their
corporate, management and  operational structures and  personnel, their  history
and  significant  achievements,  their  product lines  and  emphasis,  and their
investment philosophy and style; the investment performance of accounts  advised
by  FCM  and  FCEM as  compared  to  various benchmarks  and  to  the investment
performance of  the  portion  of  WGS's  assets  managed  by  Batterymarch;  the
financial  statements of Hypo F&C (FCM's parent); and certain regulatory filings
of FCM and FCEM.
 
Upon conclusion of its  review of these materials  and the presentation made  by
MFS,  the  Board of  Trustees, including  the Independent  Trustees, unanimously
approved the proposed  New Sub-Investment  Advisory Agreements.  In deciding  to
approve  these Agreements, the Board placed particular emphasis on the following
factors:
 
 (i) the investment  performance of  FCM and  FCEM in  managing emerging  market
     investments   as   those   results   significantly   outperformed  relevant
     benchmarks;
 
 (ii) the depth, qualifications  and experience of  FCM's and FCEM's  investment
      management  and research personnel and the fact  that FCM and FCEM have 23
      investment management and research personnel devoted to emerging markets;
 
 (iii) the terms of the proposed  New Sub-Investment Advisory Agreements,  which
       are  substantially  identical  to  the  Current  Sub-Investment  Advisory
       Agreement;
 
 (iv) the fact that FCM  and FCEM would receive  from MFS the same  compensation
      for their sub-advisory services as MFS currently pays Batterymarch;
 
 (v) the  history, reputation and background of FCM and FCEM and their financial
     condition; and
 
 (vi) the fact  that MFS  and FCM  have entered  into a  strategic alliance,  as
      discussed  above under the caption "Description of FCM and FCEM; Strategic
      Alliance between MFS and FCM."
 
THE BOARD  OF  TRUSTEES HAS  DETERMINED  THAT THE  PROPOSED  NEW  SUB-INVESTMENT
ADVISORY  AGREEMENTS ARE IN  THE BEST INTEREST  OF WGS AND  ITS SHAREHOLDERS AND
RECOMMENDS THEIR APPROVAL BY SHAREHOLDERS.
 
DESCRIPTION OF THE NEW SUB-INVESTMENT ADVISORY AGREEMENTS
 
    The Advisory Agreement between MFS and  the Trust on behalf of WGS,  permits
MFS  from time  to time  to engage  one or  more sub-advisers  to assist  in the
performance of its services. Pursuant to the Advisory Agreement, MFS has engaged
Batterymarch as one of two sub-advisers to WGS.
 
Under the proposed  New Sub-Investment  Advisory Agreement between  MFS and  FCM
(the  "FCM Agreement"),  which is identical  in all substantive  respects to the
Current Sub-Investment Advisory Agreement, MFS may delegate to FCM the authority
to make  investment decisions  for WGS.  Pursuant to  the FCM  Agreement, it  is
intended that FCM, through FCEM, would provide portfolio management services for
assets  of WGS invested in emerging markets. For its services, MFS would pay FCM
an annual management fee computed and paid monthly, in an amount equal to  1.00%
per  annum of the average daily net asset  value of WGS's assets managed by FCM.
This is the  same fee  as is  currently paid by  MFS to  Batterymarch under  the
Current Sub-Investment Advisory Agreement.
 
                                       5
<PAGE>
The  terms of the FCM Agreement would permit FCM from time to time to engage one
or more sub-advisers  to assist in  the performance of  its services. Under  the
terms of the proposed New Sub-Investment Advisory Agreement between FCM and FCEM
(the  "FCEM Agreement"),  FCM would delegate  to FCEM its  obligations under the
terms of  the FCM  Agreement,  which reflects  the fact  that  FCEM is  the  FCM
affiliate  which has  the investment  expertise in  emerging markets.  For these
services, FCM would pay FCEM under  the FCEM Agreement a sub-advisory fee  equal
to  1.00% on  an annualized basis  of the average  daily net asset  value of the
assets of WGS managed by FCEM. The FCEM Agreement is substantially identical  to
the FCM Agreement.
 
Under  the terms of the proposed New Sub-Investment Advisory Agreements, FCM and
FCEM would be  required to furnish  MFS with information  and advice,  including
advice  on  the allocation  of investments  among  emerging market  countries or
regions, relating to such portion of WGS's assets as MFS shall from time to time
designate, to furnish continuously  an investment program  with respect to  such
assets,  and  otherwise  to  manage WGS's  investments  in  accordance  with the
investment objective  and  policies  as  stated  in  the  Trust's  then  current
Prospectus  and Statement of Additional Information. FCM and FCEM would bear all
expenses in connection with the performance of their services under the proposed
New Sub-Investment Advisory Agreements.
 
The proposed New Sub-Investment Advisory Agreements provide that in the  absence
of  willful misfeasance,  bad faith  or gross  negligence, neither  FCM nor FCEM
shall be liable for any act or omission in the course of, or in connection with,
the rendering of their services thereunder.
 
Each proposed  New  Sub-Investment Advisory  Agreement  would remain  in  effect
pursuant  to its  terms until  November 1,  1996, and  thereafter for successive
periods if and so  long as such continuation  is specifically approved at  least
annually  by (a) the Board of Trustees of  the Trust or (b) the affirmative vote
of the lesser of (1) more than fifty percent (50%) of the outstanding shares  of
WGS or (2) sixty-seven percent (67%) or more of the shares of WGS present at the
meeting  if more than fifty  percent (50%) of the  outstanding shares of WGS are
represented at the meeting in person  or by proxy (a "Majority Vote"),  provided
that  in either  event the continuation  also is  approved by a  majority of the
Independent Trustees  by a  vote cast  in person  at a  meeting called  for  the
purpose  of voting on  such approval. Each  proposed New Sub-Investment Advisory
Agreement would be terminable, without penalty, by the Board of Trustees of  the
Trust,  by a Majority Vote of  WGS's shareholders, by MFS or  by FCM, and in the
case of the FCEM  Agreement, by FCEM, in  each case on not  more than sixty  nor
less  than thirty  days' written notice  to the  other party and  to WGS, unless
terminated by FCM, with respect to the  FCM Agreement, or FCEM, with respect  to
the FCEM Agreement, in which case such termination is required to be on not more
than  ninety days  nor less  than sixty days  written notice.  Each proposed New
Sub-Investment Advisory Agreement would terminate automatically in the event  of
its  assignment (as defined in the 1940 Act)  or in the event of the termination
of the Advisory Agreement between the Trust, on behalf of WGS, and MFS.
 
The description  of  the  proposed New  Sub-Investment  Advisory  Agreements  is
qualified  in its entirety by  reference to the forms  of FCM Agreement and FCEM
Agreement which are attached as Appendix C and Appendix D, respectively, to this
proxy statement.
 
MANNER OF VOTING PROXIES AND VOTE REQUIRED
 
    All proxies received by management of the Trust will be voted on all matters
presented at the Meeting and at any adjournments thereof, and, if not limited to
the contrary, will be voted FOR Item  1. Approval of Item 1 requires a  Majority
Vote of WGS's shareholders (as defined above).
 
Management  of the  Trust knows  of no  other matters  to be  brought before the
Meeting. If,  however,  any  other  matters come  before  the  Meeting  and  any
adjournments  thereof, it is management's intention  that proxies not limited to
the contrary will be voted in accordance with the judgment of the persons  named
in the enclosed form of proxy.
 
                                       6
<PAGE>
SUBMISSION OF CERTAIN PROPOSALS
 
    The  Trust is a Massachusetts business trust, and as such is not required to
hold annual meetings of shareholders.  However, meetings of shareholders may  be
held  from time to time  to consider such matters  as the approval of investment
management agreements or changes  in certain investment restrictions.  Proposals
of  shareholders  which are  intended to  be  presented at  future shareholder's
meetings must be received by  the Trust a reasonable  time prior to the  Trust's
solicitation of proxies relating to such future meeting.
 
ADDITIONAL INFORMATION
 
    The  information contained in this proxy  statement relating to FCM and FCEM
has been furnished by FCM and FCEM.
 
As discussed above, the Trust engages MFS  as investment adviser to WGS. MFS,  a
Delaware  corporation, with offices at 500 Boylston Street, Boston, MA 02116, is
a wholly owned subsidiary  of Sun Life Assurance  Company of Canada (U.S.),  One
Sun  Life Executive Park, Wellesley Hills, Massachusetts 02181, which is in turn
a wholly owned  subsidiary of  Sun Life Assurance  Company of  Canada, 150  King
Street West, Toronto, Canada M5H1J9.
 
April 3, 1996                                          MFS/Sun Life Series Trust
                                                             World Growth Series
 
                                       7
<PAGE>
                                   APPENDIX A
                            DIRECTORS AND PRINCIPAL
                            EXECUTIVE OFFICER OF FCM
 
<TABLE>
<CAPTION>
NAME                   POSITION WITH FCM, PRINCIPAL OCCUPATION AND ADDRESS(1)
- - - ---------------------  -------------------------------------------------------------------------------------------------
<S>                    <C>
M.J. Hart              (Chairman) Head of UK Department
J.D.D. Ogilvy          Chief Executive (Principal Executive Officer)
A.K. Banerji           Chief Investment Officer of FCEM
A.C. Barker            Head of U.S. Management
K.R. Barker            Head of U.K. Equities
M.J. Boxford           Investment Manager -- Venture Capital
F.G.W. Brooke          Investment Management -- Charities
A.W. Twiston-Davies    Managing Director of FCEM
S.W.E. Dolbear         Head of Derivatives Management
R.G. Donkin            Director and Joint Company Secretary
R.E. Dowdall           Finance Director
W.J. Ducas(2)          Managing Director U.S. Institutional Marketing
W.D. Eccles            Investment Manager -- Venture Capital
R.S. Edgar             Institutional Europe/U.S. Business Development
J.A. Findlay           Investment Management -- North America
F.H.G. Hunt            Investment Manager -- Fixed Interest
G. Inderst             Assistant Chief Investment Officer
S.E.V. James           Managing Director -- Marketing U.K. Retail
S.L. Kinnersley        Investment Management -- LTCB
J.F. Lubran            Managing Director -- Marketing Global Institutional
J.V. Monckton          Head of Fixed Interest Department
N.E. Morecroft         U.K. Marketing Director
J.J. Nelson            Managing Director of Venture Capital Subsidiary
F.A.R. Packard         Chairman of FCEM and Institutional Marketing
M.F. Palone(2)         Director U.S. Institutional Marketing
N.H. Pitt-Lewis        Head of Compliance
R.L. Richards          Investment Manager -- Venture Capital
M.J.C. Robertson       Charities Sales Director
E. Scott-Forbes        Head of European Equities
R. Simpson             Client Services Director
C. Thomson             Chief Investment Officer
J.J. Tigue             Investment Management -- U.K.
G.R. Walker            Chief Operating Officer and Group Finance Officer
C.A. Walton            Marketing Director
R.T. Watson            Investment Management -- U.K. Institutional
S.F. White             Investment Management -- Europe
E.J. Wood              Investment Management -- U.K.
I.K. Wright            Investment Management -- Japan
</TABLE>
 
- - - ------------------------------
 
(1)The  address  of each  of  the individuals  listed  above is  Exchange House,
Primrose Street, London EC2A 2NY, United Kingdom, unless indicated otherwise.
 
(2)The address of Messrs. Ducas and  Palone is Suite 2910, 225 Franklin  Street,
Boston, Massachusetts 02110.
 
                                      A-1
<PAGE>
                            DIRECTORS AND PRINCIPAL
                           EXECUTIVE OFFICER OF FCEM
 
<TABLE>
<CAPTION>
NAME                    POSITION WITH FCEM, PRINCIPAL OCCUPATION AND ADDRESS(1)
- - - ----------------------  ---------------------------------------------------------------------------------------------------
 
<S>                     <C>
A.W. Twiston Davies     Managing Director (Principal Executive Officer)
A.K. Banerji            Chief Investment Officer
H.P. Carey              S.E. Asia
S. Delman               Emerging Europe/Middle East/Africa
M.C. Gabriel            Finance Director
E.B. McLaughlin         Latin America
F.A.R. Packard          Chairman
J.D.D. Ogilvy           Chief Executive (Principal Executive Officer) of FCM
M.A.J.A. Wenhammer      Fixed Interest
H.R. Williamson         Fixed Interest Director
K.J. Clarke             Administration Director
</TABLE>
 
- - - ------------------------------
 
(1)The  address  of each  of  the individuals  listed  above is  Exchange House,
Primrose Street, London EC2A 2NY, United Kingdom.
 
                                      A-2
<PAGE>
                                   APPENDIX B
                   REGISTERED INVESTMENT COMPANIES FOR WHICH
                                FCM AND/OR FCEM
                      CURRENTLY ACT AS INVESTMENT ADVISER
                                 OR SUB-ADVISER
<TABLE>
<CAPTION>
                                                         NET ASSETS AT                      ANNUAL ADVISORY FEE
                                                           12/31/95       NET ASSETS AT    RATE (AS A PERCENTAGE
                                                          MANAGED BY        12/31/95        OF AVERAGE DAILY NET
                         NAME                                 FCM        MANAGED BY FCEM   ASSETS MANAGED BY FCM)
- - - -------------------------------------------------------  -------------   ---------------   ----------------------
<S>                                                      <C>             <C>               <C>
MFS/Foreign & Colonial International Growth Fund(1),
which seeks capital appreciation.......................    $29,425,265     $11,882,620              0.80%
MFS/Foreign & Colonial International Growth and Income
Fund(1), which seeks capital appreciation and current
income.................................................    $10,944,081     $ 1,302,061              0.75%
MFS/Foreign & Colonial International Emerging Markets
Equity Fund(1), which seeks capital appreciation.......    $        0      $16,554,998              1.00%
MFS/Foreign & Colonial International Growth Series(2),
which seeks capital appreciation.......................    $        0      $         0              0.80%
MFS/Foreign & Colonial International Growth and Income
Series(2), which seeks capital appreciation and current
income.................................................    $5,224,831      $   487,010              0.75%
MFS/Foreign & Colonial Emerging Markets Equity
Series(2), which seeks capital appreciation............    $        0      $         0              1.00%
The Foreign & Colonial Emerging Middle East Fund, Inc.,
which seeks long-term capital appreciation.............       N/A          $36,354,980              N/A
 
<CAPTION>
                                                           ANNUAL ADVISORY FEE
                                                          RATE (AS A PERCENTAGE
                                                          OF AVERAGE DAILY NET
                         NAME                            ASSETS MANAGED BY FCEM)
- - - -------------------------------------------------------  -----------------------
<S>                                                      <C>
MFS/Foreign & Colonial International Growth Fund(1),
which seeks capital appreciation.......................            1.00%
MFS/Foreign & Colonial International Growth and Income
Fund(1), which seeks capital appreciation and current
income.................................................            1.00%
MFS/Foreign & Colonial International Emerging Markets
Equity Fund(1), which seeks capital appreciation.......            1.00%
MFS/Foreign & Colonial International Growth Series(2),
which seeks capital appreciation.......................            1.00%
MFS/Foreign & Colonial International Growth and Income
Series(2), which seeks capital appreciation and current
income.................................................            1.00%
MFS/Foreign & Colonial Emerging Markets Equity
Series(2), which seeks capital appreciation............            1.00%
The Foreign & Colonial Emerging Middle East Fund, Inc.,
which seeks long-term capital appreciation.............            1.25%(3)
</TABLE>
 
- - - ------------------------------
 
(1)A series of MFS Series Trust X.
 
(2)A series of MFS/Sun Life Series Trust.
 
(3)FCEM receives 1.25% of the value of the Fund's average weekly net assets  (as
opposed to average daily net assets).
 
                                      B-1
<PAGE>
                                   APPENDIX C
                                    FORM OF
                       SUB-INVESTMENT ADVISORY AGREEMENT
 
SUB-ADVISORY  AGREEMENT,  dated  this  1st  day  of  May,  1996  by  and between
MASSACHUSETTS FINANCIAL SERVICES COMPANY, a Delaware corporation (the "Adviser")
and FOREIGN & COLONIAL MANAGEMENT LIMITED, a company incorporated under the laws
of England and Wales (the "Sub-Adviser").
 
                                  WITNESSETH:
 
WHEREAS, the  Adviser provides  the World  Growth Series  ("WGS"), a  series  of
MFS/Sun  Life  Series  Trust  (the  "Trust"),  an  open-end  investment  company
registered under  the Investment  Company Act  of 1940,  as amended  (the  "1940
Act"),  business services pursuant to the  terms and conditions of an investment
advisory agreement dated October 29, 1993 (the "Advisory Agreement") between the
Adviser and the Trust, on behalf of WGS; and
 
WHEREAS, the Sub-Adviser is  willing to provide services  to the Adviser on  the
terms and conditions hereinafter set forth.
 
NOW,  THEREFORE, in consideration of the  mutual covenants and agreements of the
parties hereto as herein set forth, the parties covenant and agree as follows:
 
1.  DUTIES  OF THE SUB-ADVISER.  The Sub-Adviser will  furnish the Adviser  with
information  and advice, including advice on the allocation of investments among
emerging market countries or regions, relating  to such portion of WGS'S  assets
as  the Adviser  shall from  time to  time designate  (the "Designated Assets").
Subject to the supervision  of the Trustees  of the Trust  and the Adviser,  the
Sub-Adviser  will:  (a)  manage  the  Designated  Assets  on  behalf  of  WGS in
accordance with WGS's investment objective,  policies and limitations as  stated
in  the  Trust's then  current Prospectus  (the  "Prospectus") and  Statement of
Additional Information (the "Statement"), and  the Trust's Declaration of  Trust
dated  February  15,  1985, and  By-Laws,  each  as amended  from  time  to time
(respectively, the "Declaration" and the  "By-Laws") and in compliance with  the
1940  Act and the rules, regulations  and orders thereunder; (b) make investment
decisions with respect  to the Designated  Assets; (c) place  purchase and  sale
orders  for portfolio  transactions with respect  to the  Designated Assets; (d)
manage otherwise uninvested cash assets  with respect to the Designated  Assets;
(e)  as the  agent of  WGS, give instructions  (including trade  tickets) to the
custodian and any sub-custodian of WGS as to deliveries of securities, transfers
of currencies and payments  of cash with respect  to the Designated Assets  (the
Sub-Adviser  shall promptly notify the Adviser of such instructions); (f) employ
professional portfolio managers to provide research services to WGS; (g)  attend
periodic  meetings of the Board of Trustees of  the Trust and (h) obtain all the
registrations,  qualifications  and  consents,  on  behalf  of  WGS,  which  are
necessary  for WGS to purchase and sell  assets in each jurisdiction (other than
the United States)  in which  WGS's Designated Assets  are to  be invested  (the
Sub-Adviser  shall  promptly  provide  the  Adviser  with  copies  of  any  such
registrations, qualifications and  consents). In providing  these services,  the
Sub-Adviser  will furnish continuously an investment program with respect to the
Designated Assets. The  Sub-Adviser shall  be responsible  for monitoring  WGS's
compliance  with the Prospectus, the Statement, the Declaration, the By-Laws and
the 1940 Act and the rules, regulations and orders thereunder and in  monitoring
such  compliance the Sub-Adviser shall do so  in the functional currency of WGS.
The  Sub-Adviser   shall   only  be   responsible   for  compliance   with   the
above-mentioned  restrictions in regards  to the Designated  Assets. The Adviser
agrees to provide  the Sub-Adviser  with such  assistance as  may be  reasonably
requested  by  the  Sub-Adviser in  connection  with its  activities  under this
Agreement, including, without limitation, information concerning WGS, its  funds
available,  or  to become  available,  for investment  and  generally as  to the
conditions of  WGS's affairs.  From time  to time  the Adviser  will notify  the
Sub-Adviser  of the aggregate  U.S. Dollar amount of  the Designated Assets. The
Adviser will have
 
                                      C-1
<PAGE>
responsibility for exercising proxy, consent and other rights pertaining to  the
Designated  Assets; PROVIDED, HOWEVER, that  the Sub-Adviser will, as requested,
make recommendations  to the  Adviser as  to  the manner  in which  such  proxy,
consent and other rights should be exercised.
 
Should  the  Trustees  of  the  Trust  or  the  Adviser  at  any  time  make any
determination as  to investment  policy and  notify the  Sub-Adviser thereof  in
writing, the Sub-Adviser shall be bound by such determination for the period, if
any, specified in such notice or until notified that such determination has been
revoked. Further, the Adviser or the Trustees of the Trust may at any time, upon
written  notice  to  the  Sub-Adviser,  suspend or  restrict  the  right  of the
Sub-Adviser to determine what Designated Assets  shall be purchased or sold  and
what portion, if any, of WGS's Designated Assets shall be held uninvested. It is
understood  that the Adviser undertakes to discuss with the Sub-Adviser any such
determinations of investment policy and  any such suspension or restrictions  on
the  right  of the  Sub-Adviser  to determine  what  Designated Assets  shall be
purchased or sold or held uninvested, prior to the implementation thereof.
 
2.   CERTAIN INFORMATION  TO  THE SUB-ADVISER.  Copies  of the  Prospectus,  the
Statement,   the  Declaration  and  the  By-Laws  have  been  delivered  to  the
Sub-Adviser. The Adviser agrees to notify the Sub-Adviser of each change in  the
investment  policies of  WGS and  to provide to  the Sub-Adviser  as promptly as
practicable copies  of all  amendments and  supplements to  the Prospectus,  the
Statement,  the  Declaration  and the  By-Laws.  In addition,  the  Adviser will
promptly  provide  the  Sub-Adviser  with  any  procedures  applicable  to   the
Sub-Adviser adopted from time to time by the Trustees of the Trust and agrees to
provide promptly to the Sub-Adviser copies of all amendments thereto.
 
3.  EXECUTION OF CERTAIN DOCUMENTS. Subject to any other written instructions of
the  Adviser and the Trustees of the  Trust, the Sub-Adviser is hereby appointed
the Adviser's  and the  Trust's agent  and attorney-in-fact  to execute  account
documentation,  agreements,  contracts and  other  documents as  the Sub-Adviser
shall be  requested by  brokers, dealers,  counterparties and  other persons  in
connection with its management of the Designated Assets.
 
4.   REPORTS. The Sub-Adviser shall furnish to  the Trustees of the Trust or the
Adviser, or both, as may be appropriate, quarterly reports of its activities  on
behalf of WGS, as required by applicable law or as otherwise requested from time
to  time  by the  Trustees  of the  Trust or  the  Adviser, and  such additional
information, reports, evaluations, analyses and opinions as the Trustees of  the
Trust or the Adviser, as appropriate, may request from time to time.
 
5.   BROKERAGE. In connection  with the selections of  brokers, dealers or other
entities and  the placing  of orders  for  the purchase  and sale  of  portfolio
investments  for WGS, the Sub-Adviser  is directed to seek  for WGS execution at
the  most  favorable  price  by   responsible  brokerage  firms  at   reasonably
competitive  commission rates.  In fulfilling this  requirement, the Sub-Adviser
shall not be  deemed to  have acted  unlawfully or  to have  breached any  duty,
created  by this Agreement or  otherwise, solely by reason  of its having caused
WGS to  pay  a broker,  dealer  or other  entity  an amount  of  commission  for
effecting a securities transaction in excess of the amount of commission another
broker,   dealer  or  other  entity  would   have  charged  for  effecting  that
transaction, if the  Sub-Adviser determined in  good faith that  such amount  of
commission was reasonable in relation to the value of the brokerage and research
services  (within the meaning of Section 28(e) of the Securities Exchange Act of
1934, as amended)  provided by such  broker, dealer or  other entity, viewed  in
terms  of  either  that  particular  transaction  or  the  Sub-Adviser's overall
responsibilities with respect to WGS and to other clients of the Sub-Adviser  as
to which the Sub-Adviser exercises investment discretion.
 
6.   SERVICES TO OTHER COMPANIES OR  ACCOUNTS. On occasions when the Sub-Adviser
deems the purchase or sale of  a security to be in  the best interest of WGS  as
well  as other clients,  the Sub-Adviser, to the  extent permitted by applicable
laws and regulations, may,  but shall be under  no obligation to, aggregate  the
securities  to be  so purchased or  sold in  order to obtain  the most favorable
price or lower  brokerage commissions  and efficient execution.  In such  event,
allocation of the securities so
 
                                      C-2
<PAGE>
purchased  or sold, as well as the  expenses incurred in the transaction will be
made by the Sub-Adviser in the manner it considers to be the most equitable. The
Sub-Adviser agrees  to allocate  similarly opportunities  to sell  or  otherwise
dispose of securities among WGS and other clients of the Sub-Adviser.
 
7.    OTHER SUB-ADVISERS.  The  Sub-Adviser may  from  time to  time  enter into
investment sub-advisory agreements  with one  or more  investment advisers,  (an
"Other  Sub-Adviser"), to WGS to  perform some or all  of the services for which
the Sub-Adviser is responsible  pursuant to this Agreement  upon such terms  and
conditions  as the Adviser and the Sub-Adviser may determine; PROVIDED, HOWEVER,
that such investment sub-advisory agreements have been approved by a majority of
the Trustees of the Trust  who are not interested persons  of the Trust, or  the
Sub-Adviser  or  the  Other  Sub-Adviser  and  by  vote  of  a  majority  of the
outstanding  voting  securities  of  WGS;  and,  PROVIDED,  FURTHER,  that   the
Sub-Adviser  shall  own  a  majority  of  the  voting  securities  of  any Other
Sub-Adviser. The Sub-Adviser may terminate the services of any Other Sub-Adviser
at any  time  in  its  sole  discretion, and  shall  at  such  time  assume  the
responsibilities  of such Other  Sub-Adviser unless and  until a successor Other
Sub-Adviser is  selected. The  Sub-Adviser  shall be  liable  for any  error  of
judgment  or mistake of law by any Other Sub-Adviser and for any act or omission
in the execution and management of WGS by any Other Sub-Adviser.
 
8.  COMPENSATION  OF THE SUB-ADVISER.  For the  services to be  rendered by  the
Sub-Adviser  under  this Agreement,  the Adviser  shall  pay to  the Sub-Adviser
compensation, computed and paid monthly in arrears in U.S. dollars, at a rate of
1.00% per annum of the average daily  net asset value of the Designated  Assets.
If  the  Sub-Adviser shall  serve  for less  than the  whole  of any  month, the
compensation payable to the  Sub-Adviser with respect to  WGS will be  prorated.
The  Sub-Adviser will pay  its expenses incurred in  performing its duties under
this Agreement. Neither the Trust nor WGS shall be liable to the Sub-Adviser for
the compensation of the Sub-Adviser. For the purpose of determining fees payable
to the Sub-Adviser, the value of WGS's net assets shall be computed at the times
and in the  manner specified in  the Prospectus and/or  Statement. In the  event
that the Adviser reduces its management fee payable under the Advisory Agreement
in order to comply with the expense limitations of a State securities commission
or  otherwise (but not a voluntary  reduction), the Sub-Adviser agrees to reduce
its fee payable under this Agreement by a pro rata amount.
 
9.  LIMITATION  OF LIABILITY OF  THE SUB-ADVISER. The  Sub-Adviser shall not  be
liable  for any error of judgment or mistake  of law or for any loss arising out
of any investment or for any act or omission in the execution and management  of
WGS,  except  for willful  misfeasance,  bad faith  or  gross negligence  in the
performance of its  duties and obligations  hereunder. The Trust,  on behalf  of
WGS, may enforce any obligations of the Sub-Adviser under this Agreement and may
recover directly from the Sub-Adviser for any liability it may have to WGS.
 
10.   ACTIVITIES OF THE SUB-ADVISER. The services of the Sub-Adviser to the Fund
are not deemed to be exclusive, the Sub-Adviser being free to render  investment
advisory  and/or other services  to others. It is  understood that the Trustees,
officers and shareholders  of the Trust,  WGS or the  Adviser are or  may be  or
become interested in the Sub-Adviser or any person controlling, controlled by or
under  common control with the Sub-Adviser,  as trustees, officers, employees or
otherwise and that trustees,  officers and employees of  the Sub-Adviser or  any
person  controlling, controlled by or under  common control with the Sub-Adviser
may become similarly interested in  the Trust, WGS or  the Adviser and that  the
Sub-Adviser may be or become interested in WGS as a shareholder or otherwise.
 
11.   COVENANTS OF THE SUB-ADVISER. The  Sub-Adviser agrees that it (a) will not
deal with itself, "affiliated persons" of  the Sub-Adviser, the Trustees of  the
Trust  or WGS's distributor, as principals, agents, brokers or dealers in making
purchases or  sales of  securities or  other property  for the  account of  WGS,
except  as  permitted by  the 1940  Act  and the  rules, regulations  and orders
thereunder and subject to  the prior written approval  of the Adviser, (b)  will
not  take a long or short  position in the shares of  WGS except as permitted by
the Declaration and (c) will comply with all other provisions of the Declaration
and the By-Laws and  the then-current Prospectus and  Statement relative to  the
Sub-Adviser and its trustees, officers, employees and affiliates.
 
                                      C-3
<PAGE>
12.   REPRESENTATIONS, WARRANTIES AND  ADDITIONAL AGREEMENTS OF THE SUB-ADVISER.
The Sub-Adviser represents, warrants and agrees that:
 
(a)  It: (i) is  registered as an investment  adviser under the U.S.  Investment
    Advisers  Act  of  1940 (the  "Advisers  Act"), is  authorized  to undertake
    investment business in the United Kingdom by virtue of its membership in the
    Investment Management  Regulatory Organisation  ("IMRO") and  is  registered
    under  the laws of any jurisdiction in  which the Sub-Adviser is required to
    be registered as an investment adviser  in order to perform its  obligations
    under  this Agreement, and will continue to  be so registered for so long as
    this Agreement remains in effect; (ii) is not prohibited by the 1940 Act  or
    the   Advisers  Act  from  performing  the  services  contemplated  by  this
    Agreement; (iii) has  met, and will  continue to  meet for so  long as  this
    Agreement   remains  in  effect,  any  other  applicable  Federal  or  State
    requirements, or the applicable requirements  of any regulatory or  industry
    self-regulatory agency, necessary to be met in order to perform the services
    contemplated  by this  Agreement; (iv) has  the authority to  enter into and
    perform the services  contemplated by this  Agreement; (v) will  immediately
    notify  the Adviser  in writing  of the occurrence  of any  event that would
    disqualify the  Sub-Adviser from  serving  as an  investment adviser  of  an
    investment  company pursuant to  Section 9(a) of the  1940 Act or otherwise;
    and (vi) will  immediately notify the  Adviser in writing  of any change  of
    control  of the Sub-Adviser or any parent of the Sub-Adviser resulting in an
    "assignment" of this Agreement.
 
(b) It will maintain, keep current and preserve on behalf of WGS, in the  manner
    and  for the periods of  time required or permitted by  the 1940 Act and the
    rules, regulations and orders thereunder and the Advisers Act and the rules,
    regulations  and   orders  thereunder,   records  relating   to   investment
    transactions  made by the Sub-Adviser for WGS as may be reasonably requested
    by the Adviser or WGS  from time to time.  The Sub-Adviser agrees that  such
    records  are the property  of WGS, and  will be surrendered  to WGS promptly
    upon request; PROVIDED, HOWEVER, that  the Sub-Adviser may retain copies  of
    such records for archival purposes as required by IMRO.
 
(c)   The Sub-Adviser  has adopted a  written code of  ethics complying with the
    requirements of Rule 17j-1  under the 1940  Act and, if  it has not  already
    done  so, will provide the Adviser and the Trust with a copy of such code of
    ethics, and upon any amendment to such code of ethics, promptly provide such
    amendment. At least annually the Sub-Adviser will provide the Trust and  the
    Adviser  with a certificate  signed by the chief  compliance officer (or the
    person performing such function) of the Sub-Adviser certifying, to the  best
    of  his or  her knowledge,  compliance with  the code  of ethics  during the
    immediately preceding  twelve  (12)  month period,  including  any  material
    violations  of or  amendments to  the code  of ethics  or the administration
    thereof.
 
(d) It has provided  the Adviser and the  Trust with a copy  of its Form ADV  as
    most  recently filed with the Securities and Exchange Commission (the "SEC")
    and will, promptly after filing any amendment to its Form ADV with the  SEC,
    furnish a copy of such amendment to the Adviser and the Trust.
 
13.   DURATION  AND TERMINATION OF  THIS AGREEMENT. This  Agreement shall become
effective on the date first above written and shall govern the relations between
the parties hereto thereafter, and shall remain  in force until May 1, 1998  and
each  year  thereafter but  only  so long  as  its continuance  is "specifically
approved at least annually" (a) by the vote of a majority of the Trustees of the
Trust who are not "interested persons" of the Trust or of the Adviser or of  the
Sub-Adviser  at a meeting specifically called for  the purpose of voting on such
approval, and (b)  by the  Board of  Trustees of  the Trust,  or by  "vote of  a
majority  of the  outstanding voting securities"  of WGS. This  Agreement may be
terminated at any time without the payment of any penalty by the Trustees of the
Trust, by "vote of a majority of the outstanding voting securities" of WGS or by
the Adviser, on  not more  than sixty  days nor  less than  thirty days  written
notice,  or by the Sub-Adviser on not more  than ninety days nor less than sixty
days written notice. This Agreement  shall automatically terminate in the  event
of  its "assignment"  or in  the event  that the  Advisory Agreement  shall have
terminated for any reason.
 
                                      C-4
<PAGE>
14.  AMENDMENTS TO THIS  AGREEMENT. This Agreement may  be amended only if  such
amendment  is  approved  by  "vote  of  a  majority  of  the  outstanding voting
securities" of WGS, by the Adviser and by the Sub-Adviser.
 
15.  CERTAIN DEFINITIONS. The  terms "specifically approved at least  annually",
"vote  of  a  majority  of  the  outstanding  voting  securities", "assignment",
"control", "affiliated  persons"  and "interested  person",  when used  in  this
Agreement,  shall have the respective meanings specified, and shall be construed
in a manner consistent with, the 1940 Act and the rules, regulations and  orders
thereunder,  SUBJECT, HOWEVER, to such  exemptions as may be  granted by the SEC
under the 1940 Act.
 
16.  SURVIVAL OF REPRESENTATIONS AND WARRANTIES; DUTY TO UPDATE INFORMATION. All
representations and warranties made  by the Sub-Adviser  pursuant to Section  12
hereof  shall survive  for the  duration of  this Agreement  and the Sub-Adviser
shall immediately notify, but in no event later than five (5) business days, the
Adviser in writing upon becoming aware that any of the foregoing representations
and warranties are no longer true.
 
17.   MISCELLANEOUS.  This Agreement  shall  be  governed by  and  construed  in
accordance  with the  internal laws  of The  Commonwealth of  Massachusetts. All
notices provided for by this Agreement shall  be in writing and shall be  deemed
given when received, against appropriate receipt, by the Sub-Adviser's Secretary
in the case of the Sub-Adviser, the Adviser's General Counsel in the case of the
Adviser,  and the  Trust's Secretary in  the case of  the Trust or  WGS, or such
other person as a  party shall designate  by notice to  the other parties.  This
Agreement  constitutes  the  entire  agreement  among  the  parties  hereto  and
supersedes any prior agreement among the parties relating to the subject  matter
hereof.  The section headings of this Agreement are for convenience of reference
and do not constitute a part hereof.
 
IN WITNESS WHEREOF, the  parties have caused this  Agreement to be executed  and
delivered  in their names and on their behalf by the undersigned, thereunto duly
authorized, and their respective seals to be  hereto affixed, all as of the  day
and year first written above.
 
                                          MASSACHUSETTS FINANCIAL
                                          SERVICES COMPANY
                                          By:
                                          --------------------------------------
                                            Jeffrey L. Shames
                                            President
 
                                          FOREIGN & COLONIAL
                                          MANAGEMENT LIMITED
                                          By:
                                          --------------------------------------
                                            James Ogilvy
 
                                          By:
                                          --------------------------------------
                                            Jonathan Lubran
 
                                      C-5
<PAGE>
The foregoing is hereby agreed to:
 
A copy of the Declaration of Trust of the Trust is on file with the Secretary of
State  of The Commonwealth of Massachusetts. The parties hereto acknowledge that
the obligations of or arising out of this instrument are not binding upon any of
the Trust's trustees, officers, employees, agents or shareholders  individually,
but  are binding solely upon the assets  and property of the Trust in accordance
with its proportionate interest hereunder. If this instrument is executed by the
Trust on  behalf  of  one or  more  series  of the  Trust,  the  parties  hereto
acknowledge  that the  assets and  liabilities of each  series of  the Trust are
separate and  distinct  and that  the  obligations of  or  arising out  of  this
instrument are binding solely upon the assets or property of the series on whose
behalf  the Trust has executed  this instrument. If the  Trust has executed this
instrument on behalf of more  than one series of  the Trust, the parties  hereto
also  agree that the obligations  of each series hereunder  shall be several and
not joint,  in accordance  with its  proportionate interest  hereunder, and  the
parties  hereto agree not to  proceed against any series  for the obligations of
another series.
 
MFS/SUN LIFE SERIES TRUST, on behalf of the
WORLD GROWTH SERIES
 
By:
- - - ----------------------------------------
  John D. McNeil
  Chairman
 
                                      C-6
<PAGE>
                                   APPENDIX D
                                    FORM OF
                       SUB-INVESTMENT ADVISORY AGREEMENT
 
SUB-ADVISORY AGREEMENT, dated this 1st day of May, 1996, by and between  FOREIGN
&  COLONIAL MANAGEMENT LIMITED, a company incorporated under the laws of England
and Wales (the "Sub-Adviser"), and FOREIGN & COLONIAL EMERGING MARKETS  LIMITED,
a company incorporated under the laws of England and Wales ("FCEM").
 
                                  WITNESSETH:
 
    WHEREAS,  Massachusetts Financial Services  Company (the "Adviser") provides
the World Growth  Series ("WGS"),  a series of  MFS/Sun Life  Series Trust  (the
"Trust"), an open-end investment company registered under the Investment Company
Act  of 1940,  as amended  (the "1940 Act"),  business services  pursuant to the
terms and conditions of an investment advisory agreement dated October 29,  1993
(the  "Advisory Agreement") between the Adviser and  the Trust, on behalf of the
WGS;
 
WHEREAS, the Sub-Adviser provides services to the Adviser pursuant to the  terms
and  conditions  of a  sub-advisory agreement  dated the  date hereof  (the "FCM
Sub-Advisory Agreement") between the Adviser and the Sub-Adviser; and
 
WHEREAS, FCEM is willing to provide services to the Sub-Adviser on the terms and
conditions hereinafter set forth.
 
NOW, THEREFORE, in consideration of the  mutual covenants and agreements of  the
parties hereto as herein set forth, the parties covenant and agree as follows:
 
1.   DUTIES  OF FCEM.  FCEM will  furnish the  Sub-Adviser with  information and
advice, including advice on the allocation of investments among emerging  market
countries  or regions, relating to such portion  of WGS's assets as the Adviser,
Sub-Adviser and FCEM shall from time to time mutually designate (the "Designated
Assets"). Subject to the supervision of  the Trustees of the Trust, the  Adviser
and  the Sub-Adviser, FCEM will:  (a) manage the Designated  Assets on behalf of
WGS in accordance with WGS's  investment objective, policies and limitations  as
stated  in the Trust's then current  Prospectus (the "Prospectus") and Statement
of Additional  Information (the  "Statement"), and  the Trust's  Declaration  of
Trust  dated February 15,  1985 and By-Laws,  each as amended  from time to time
(respectively, the "Declaration" and the  "By-Laws") and in compliance with  the
1940  Act and the rules, regulations  and orders thereunder; (b) make investment
decisions with respect  to the Designated  Assets; (c) place  purchase and  sale
orders  for portfolio  transactions with respect  to the  Designated Assets; (d)
manage otherwise uninvested cash assets  with respect to the Designated  Assets;
(e)  as the  agent of  WGS, give instructions  (including trade  tickets) to the
custodian and any sub-custodian of WGS as to deliveries of securities, transfers
of currencies and payments of cash  with respect to the Designated Assets  (FCEM
shall promptly notify the Adviser and the Sub-Adviser of such instructions); (f)
employ  professional portfolio managers to provide research services to WGS; (g)
attend periodic meetings of the  Board of Trustees of  the Trust and (h)  obtain
all  the registrations, qualifications and consents, on behalf of WGS, which are
necessary for WGS to purchase and  sell assets in each jurisdiction (other  than
the United States) in which the Designated Assets are to be invested (FCEM shall
promptly  provide  the  Adviser and  the  Sub-Adviser  with copies  of  any such
registrations, qualifications and consents).  In providing these services,  FCEM
will  furnish continuously an investment program  with respect to the Designated
Assets. FCEM  shall be  responsible  for monitoring  WGS's compliance  with  the
Prospectus, the Statement, the Declaration, the By-Laws and the 1940 Act and the
rules,  regulations and orders thereunder and in monitoring such compliance FCEM
shall do so in the  functional currency of WGS.  FCEM shall only be  responsible
for   compliance  with  the  above-mentioned  restrictions  in  regards  to  the
Designated
 
                                      D-1
<PAGE>
Assets. The Sub-Adviser agrees  to provide FCEM with  such assistance as may  be
reasonably  requested  by  FCEM in  connection  with its  activities  under this
Agreement, including, without limitation, information concerning WGS, its  funds
available,  or  to become  available,  for investment  and  generally as  to the
conditions of the Fund's affairs.
 
Should the Trustees of the Trust or the Adviser and the Sub-Adviser at any  time
make  any  determination as  to  investment policy  and  notify FCEM  thereof in
writing, FCEM  shall be  bound by  such determination  for the  period, if  any,
specified  in such  notice or  until notified  that such  determination has been
revoked. Further, the Adviser and the  Sub-Adviser or the Trustees of the  Trust
may  at any time, upon written notice to  FCEM, suspend or restrict the right of
FCEM to  determine what  assets  of WGS  shall be  purchased  or sold  and  what
portion, if any, of WGS's assets shall be held uninvested. It is understood that
the  Adviser  and  the  Sub-Adviser  undertake to  discuss  with  FCEM  any such
determinations of investment policy and any such suspensions or restrictions  on
the  right of FCEM to determine what assets of WGS shall be purchased or sold or
held uninvested, prior to the implementation thereof.
 
2.  EXECUTION OF CERTAIN DOCUMENTS. Subject to any other written instructions of
the Adviser,  the Sub-Adviser  and the  Trustees of  the Trust,  FCEM is  hereby
appointed  the  Sub-Adviser's  and  the Trust's  agent  and  attorney-in-fact to
execute account documentation, agreements, contracts and other documents as FCEM
shall be  requested by  brokers, dealers,  counterparties and  other persons  in
connection with its management of the Designated Assets.
 
3.   BROKERAGE. In connection  with the selections of  brokers, dealers or other
entities and  the placing  of orders  for  the purchase  and sale  of  portfolio
investments  for WGS with respect to the  Designated Assets, FCEM is directed to
seek for WGS  execution at  the most  favorable price  by responsible  brokerage
firms   at  reasonably   competitive  commission   rates.  In   fulfilling  this
requirement, FCEM  shall not  be deemed  to  have acted  unlawfully or  to  have
breached  any duty, created by this Agreement  or otherwise, solely by reason of
its having caused  WGS to  pay a  broker, dealer or  other entity  an amount  of
commission  for effecting  a securities transaction  in excess of  the amount of
commission another  broker,  dealer  or  other entity  would  have  charged  for
effecting that transaction, if FCEM determined in good faith that such amount of
commission was reasonable in relation to the value of the brokerage and research
services  (within the meaning of Section 28(e) of the Securities Exchange Act of
1934, as amended)  provided by such  broker, dealer or  other entity, viewed  in
terms  of either that particular  transaction or FCEM's overall responsibilities
with respect to  WGS and to  other clients of  FCEM as to  which FCEM  exercises
investment discretion.
 
4.  REPORTS. FCEM shall furnish to the Trustees of the Trust, the Adviser or the
Sub-Adviser,  or all of  them, as may  be appropriate, quarterly  reports of its
activities on  behalf of  WGS, as  required by  applicable law  or as  otherwise
requested  from time to  time by the Trustees  of the Trust,  the Adviser or the
Sub-Adviser, and such additional information, reports, evaluations, analyses and
opinions as  the Trustees  of the  Trust,  the Adviser  or the  Sub-Adviser,  as
appropriate, may request from time to time.
 
5.   SERVICES TO OTHER  COMPANIES OR ACCOUNTS. On  occasions when FCEM deems the
purchase or sale of  a security to  be in the  best interest of  WGS as well  as
other clients, FCEM, to the extent permitted by applicable laws and regulations,
may,  but shall  be under no  obligation to,  aggregate the securities  to be so
purchased or sold in order to obtain the most favorable price or lower brokerage
commissions and efficient execution. In such event, allocation of the securities
so purchased or sold, as well as  the expenses incurred in the transaction  will
be made by FCEM in the manner it considers to be the most equitable. FCEM agrees
to  allocate similarly opportunities to sell  or otherwise dispose of securities
among WGS and other clients of FCEM.
 
6.  COMPENSATION OF  FCEM. For the  services to be rendered  by FCEM under  this
Agreement,  the Sub-Adviser  shall pay to  FCEM compensation,  computed and paid
monthly in arrears, at a rate of 1.00% per annum of the average daily net  asset
value  of the Designated Assets. If FCEM shall  serve for less than the whole of
any month,  the  compensation  payable to  FCEM  with  respect to  WGS  will  be
prorated.  FCEM will  pay its expenses  incurred in performing  its duties under
this Agreement. Neither the Trust, the Adviser  nor WGS shall be liable to  FCEM
for  the compensation of  FCEM. For the  purpose of determining  fees payable to
FCEM,
 
                                      D-2
<PAGE>
the value of WGS's net assets shall be  computed at the times and in the  manner
specified  in the Prospectus and/or Statement. In the event that the Sub-Adviser
reduces its management fee payable under the FCM Sub-Advisory Agreement in order
to comply  with the  expense limitations  of a  State securities  commission  or
otherwise (but not a voluntary reduction), FCEM agrees to reduce its fee payable
under this Agreement by a pro rata amount.
 
7.   LIMITATION OF LIABILITY OF FCEM. FCEM  shall not be liable for any error of
judgment or mistake of law or for any loss arising out of any investment or  for
any  act or omission in the execution  and management of WGS, except for willful
misfeasance, bad faith or gross negligence in the performance of its duties  and
obligations  hereunder. The Trust, on behalf of WGS, may enforce any obligations
of FCEM  under  this  Agreement and  may  recover  directly from  FCEM  for  any
liability it may have to WGS.
 
8.    ACTIVITIES OF  FCEM. The  services of  FCEM to  WGS are  not deemed  to be
exclusive, FCEM being free to  render investment advisory and/or other  services
to  others. It is understood that the Trustees, officers and shareholders of the
Trust, WGS, the Adviser or the Sub-Adviser are or may become interested in  FCEM
or  any person controlling, controlled by or  under common control with FCEM, as
trustees, officers,  employees  or otherwise  and  that trustees,  officers  and
employees  of  FCEM or  any person  controlling, controlled  by or  under common
control with FCEM may become similarly interested in the Trust, WGS, the Adviser
or the  Sub-Adviser and  that FCEM  may  be or  become interested  in WGS  as  a
shareholder or otherwise.
 
9.   COVENANTS  OF FCEM.  FCEM agrees  that it  (a) will  not deal  with itself,
"affiliated persons" of  FCEM, the  Sub-Adviser, the  Trustees of  the Trust  or
WGS's distributor, as principals, agents, brokers or dealers in making purchases
or  sales of  securities or  other property  for the  account of  WGS, except as
permitted by the 1940 Act and  the rules, regulations and orders thereunder  and
subject  to the prior written approval of the  Adviser, (b) will not take a long
or short position in the  shares of WGS except  as permitted by the  Declaration
and (c) will comply with all other provisions of the Declaration and the By-Laws
and the then-current Prospectus and Statement relative to FCEM and its trustees,
officers, employees and affiliates.
 
10.    REPRESENTATIONS,  WARRANTIES  AND  ADDITIONAL  AGREEMENTS  OF  FCEM. FCEM
represents, warrants and agrees that:
 
(a)  It: (i) is  registered as an investment  adviser under the U.S.  Investment
    Advisers  Act  of  1940 (the  "Advisers  Act"), is  authorized  to undertake
    investment business in the United Kingdom by virtue of its membership in the
    Investment Management  Regulatory Organisation  ("IMRO") and  is  registered
    under  the  laws  of  any  jurisdiction in  which  FCEM  is  required  to be
    registered as  an investment  adviser in  order to  perform its  obligations
    under  this Agreement, and will continue to  be so registered for so long as
    this Agreement remains in effect; (ii) is not prohibited by the 1940 Act  or
    the   Advisers  Act  from  performing  the  services  contemplated  by  this
    Agreement; (iii) has  met, and will  continue to  meet for so  long as  this
    Agreement   remains  in  effect,  any  other  applicable  Federal  or  State
    requirements, or the applicable requirements  of any regulatory or  industry
    self-regulatory agency, necessary to be met in order to perform the services
    contemplated  by this  Agreement; (iv) has  the authority to  enter into and
    perform the services  contemplated by this  Agreement; (v) will  immediately
    notify  the Adviser and the Sub-Adviser in  writing of the occurrence of any
    event that would disqualify FCEM from serving as an investment adviser of an
    investment company pursuant to  Section 9(a) of the  1940 Act or  otherwise;
    and  (vi) will immediately notify the Adviser and the Sub-Adviser in writing
    of any change  of control  of FCEM  or any parent  of FCEM  resulting in  an
    "assignment" of this Agreement.
 
(b)  It will maintain, keep current and preserve on behalf of WGS, in the manner
    and for the periods of  time required or permitted by  the 1940 Act and  the
    rules, regulations and orders thereunder and the Advisers Act and the rules,
    regulations   and   orders  thereunder,   records  relating   to  investment
    transactions made by  FCEM for  WGS as may  be reasonably  requested by  the
    Adviser  or WGS  from time to  time. FCEM  agrees that such  records are the
    property of  WGS, and  will be  surrendered to  WGS promptly  upon  request;
    PROVIDED,  HOWEVER, that FCEM may retain copies of such records for archival
    purposes as required by IMRO.
 
                                      D-3
<PAGE>
(c)  It has adopted a written code of ethics complying with the requirements  of
    Rule  17j-1 under  the 1940  Act and, if  it has  not already  done so, will
    provide the Adviser, the Sub-Adviser and the Trust with a copy of such  code
    of  ethics, and upon any amendment to  such code of ethics, promptly provide
    such  amendment.  At  least  annually  FCEM  will  provide  the  Trust,  the
    Sub-Adviser  and  the  Adviser  with  a  certificate  signed  by  the  chief
    compliance  officer  (or  the  person  performing  such  function)  of  FCEM
    certifying, to the best of his or her knowledge, compliance with the code of
    ethics  during the immediately preceding twelve (12) month period, including
    any material  violations of  or amendments  to  the code  of ethics  or  the
    administration thereof.
 
(d)  It has provided the  Adviser, the Sub-Adviser and the  Trust with a copy of
    its Form  ADV  as most  recently  filed  with the  Securities  and  Exchange
    Commission  (the "SEC") and will, promptly after filing any amendment to its
    Form ADV with the SEC, furnish a copy of such amendment to the Adviser,  the
    Sub-Adviser and the Trust.
 
11.   DURATION  AND TERMINATION OF  THIS AGREEMENT. This  Agreement shall become
effective on the date first above written and shall govern the relations between
the parties hereto thereafter, and shall remain  in force until May 1, 1998  and
each  year  thereafter but  only  so long  as  its continuance  is "specifically
approved at least annually" (a) by the vote of a majority of the Trustees of the
Trust  who  are  not  "interested  persons"  of  the  Trust,  the  Adviser,  the
Sub-Adviser  or FCEM at a meeting specifically  called for the purpose of voting
on such approval, and (b) by the Board of Trustees of the Trust, or by "vote  of
a  majority of the outstanding voting securities"  of WGS. This Agreement may be
terminated at any time without the payment of any penalty by the Trustees of the
Trust, by "vote of a majority of the outstanding voting securities" of WGS or by
the Adviser or the Sub-Adviser, on not more than sixty days nor less than thirty
days written notice, or by FCEM on not more than ninety days nor less than sixty
days written notice. This Agreement  shall automatically terminate in the  event
of  its "assignment" or in the event  that the FCM Sub-Advisory Agreement or the
Advisory Agreement shall have terminated for any reason.
 
12.  AMENDMENTS TO THIS  AGREEMENT. This Agreement may  be amended only if  such
amendment  is  approved  by  "vote  of  a  majority  of  the  outstanding voting
securities" of WGS, by the Adviser, by the Sub-Adviser and by FCEM.
 
13.  CERTAIN DEFINITIONS. The  terms "specifically approved at least  annually",
"vote  of  a  majority  of  the  outstanding  voting  securities", "assignment",
"control", "affiliated  person"  and  "interested person",  when  used  in  this
Agreement,  shall have the respective meanings specified, and shall be construed
in a manner consistent with, the 1940 Act and the rules, regulations and  orders
thereunder,  SUBJECT, HOWEVER, to such  exemptions as may be  granted by the SEC
under the 1940 Act.
 
14.  SURVIVAL OF REPRESENTATIONS AND WARRANTIES; DUTY TO UPDATE INFORMATION. All
representations and warranties made by FCEM  pursuant to Section 9 hereof  shall
survive  for the duration  of this Agreement and  FCEM shall immediately notify,
but in  no  event  later than  five  (5)  business days,  the  Adviser  and  the
Sub-Adviser   in  writing  upon  becoming  aware   that  any  of  the  foregoing
representations and warranties are no longer true.
 
15.   MISCELLANEOUS.  This Agreement  shall  be  governed by  and  construed  in
accordance  with the  internal laws  of The  Commonwealth of  Massachusetts. All
notices provided for by this Agreement shall  be in writing and shall be  deemed
given when received, against appropriate receipt, by the Sub-Adviser's Secretary
in  the case of the Sub-Adviser, by the Adviser's General Counsel in the case of
the Adviser,  by  FCEM's Secretary  in  the case  of  FCEM and  by  the  Trust's
Secretary  in the case of the  Trust WGS, or such other  person as a party shall
designate by notice to the other parties. This Agreement constitutes the  entire
agreement  among the parties hereto and supersedes any prior agreement among the
parties relating to  the subject  matter hereof.  The section  headings of  this
Agreement are for convenience of reference and do not constitute a part hereof.
 
                                      D-4
<PAGE>
IN  WITNESS WHEREOF, the parties  have caused this Agreement  to be executed and
delivered in their names and on their behalf by the undersigned, thereunto  duly
authorized,  and their respective seals to be  hereto affixed, all as of the day
and year first written above.
 
                                          FOREIGN & COLONIAL
                                          MANAGEMENT LIMITED
 
                                          By:
                                          --------------------------------------
                                            James Ogilvy
                                          By:
                                          --------------------------------------
                                            Jonathan Lubran
                                          FOREIGN & COLONIAL
                                          EMERGING MARKETS
                                          LIMITED
 
                                          By:
                                          --------------------------------------
                                            Audley Twiston Davies
                                          By:
                                          --------------------------------------
                                            Karen Clarke
 
                                      D-5
<PAGE>
The foregoing is hereby agreed to:
 
A copy of the Declaration of Trust of the Trust is on file with the Secretary of
State of The Commonwealth of Massachusetts. The parties hereto acknowledge  that
the obligations of or arising out of this instrument are not binding upon any of
the  Trust's trustees, officers, employees, agents or shareholders individually,
but are binding solely upon the assets  and property of the Trust in  accordance
with its proportionate interest hereunder. If this instrument is executed by the
Trust  on  behalf  of  one or  more  series  of the  Trust,  the  parties hereto
acknowledge that the  assets and  liabilities of each  series of  the Trust  are
separate  and  distinct and  that  the obligations  of  or arising  out  of this
instrument are binding solely upon the assets or property of the series on whose
behalf the Trust has  executed this instrument. If  the Trust has executed  this
instrument  on behalf of more  than one series of  the Trust, the parties hereto
also agree that the  obligations of each series  hereunder shall be several  and
not  joint, in  accordance with  its proportionate  interest hereunder,  and the
parties hereto agree not  to proceed against any  series for the obligations  of
another series.
 
MFS/SUN LIFE SERIES TRUST, on behalf of the
WORLD GROWTH SERIES
 
By:
- - - ----------------------------------------
  John D. McNeil
  Chairman
 
MASSACHUSETTS FINANCIAL SERVICES
COMPANY
 
By:
- - - ----------------------------------------
  Jeffrey L. Shames
  President
 
                                      D-6
<PAGE>
                                       P
                                       R
                                       O
                                       X
                                       Y
 
By  signing and dating the lower portion of this card, you authorize the proxies
to vote each proposal as marked, or, if not marked, to vote "FOR" each  proposal
and  to use  their discretion to  vote any other  matter as may  come before the
Meeting. If you do not intend personally to attend the Meeting, please complete,
detach and mail this card at once in the enclosed envelope.
 
                           MFS/SUN LIFE SERIES TRUST
                              WORLD GROWTH SERIES
                    PROXY SOLICITED BY THE BOARD OF TRUSTEES
                         FOR A MEETING OF SHAREHOLDERS
 
The undersigned hereby  appoints John  D. McNeil, David  D. Horn  and Bonnie  S.
Angus,  and each of them,  proxies with several powers  of substitution, to vote
for the undersigned at a Meeting of  Shareholders of the World Growth Series  of
MFS/  Sun Life  Series Trust,  to be  held at  the offices  of SunLife Assurance
Company of Canada, One SunLife  Executive Park, Wellesley Hills,  Massachusetts,
on  April 29, 1996, notice of which meeting and the proxy statement accompanying
the same having been received by the undersigned, or at any adjournment thereof,
upon  the  following  matters  as  described  in  the  notice  of  Meeting   and
accompanying  proxy statement, according to the number  of votes and as fully as
the undersigned would be entitled to vote if personally present, hereby revoking
any prior proxy or proxies. If more than one of the above-named proxies shall be
present in person or  by substitute, a  majority of the  proxies so present  and
voting  shall have and may  exercise all the powers  hereby granted. Please sign
and return as soon as possible but in any event by April 29, 1996.
 
                (Continued and to be signed on the reverse side)
<PAGE>
                           MFS/SUN LIFE SERIES TRUST
                              WORLD GROWTH SERIES
 
SAID PROXIES WILL VOTE THIS PROXY AS DIRECTED, OR IF NO DIRECTION IS  INDICATED,
FOR  ITEM 1  UNLESS AUTHORITY TO  DO SO  IS SPECIFICALLY WITHHELD  IN THE MANNER
PROVIDED, AND WILL USE THEIR DISCRETION  WITH RESPECT TO ANY OTHER MATTERS  THAT
MAY COME BEFORE THE MEETING.
 
           THE BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE FOR ITEM 1
 
<TABLE>
<C>                       <C>        <S>
    VOTE ON PROPOSAL          1      To  approve two new  Sub-Investment Advisory Agreements,  one between Massachusetts
        FOR / /                      Financial Services  Company  ("MFS")  and Foreign  &  Colonial  Management  Limited
      AGAINST / /                    ("FCM"),  and the other between FCM and its subsidiary, Foreign & Colonial Emerging
      ABSTAIN / /                    Markets Limited,  containing substantially  the same  terms and  conditions as  the
                                     current  Sub-Investment Advisory  Agreement between MFS  and Batterymarch Financial
                                     Management, Inc., to become effective on or about May 1, 1996.
</TABLE>
 
                                        ________________________________________
                                                      SIGNATURE
                                      __________________________________________
                                           SIGNATURE (JOINT OWNERS)    DATE
 
Please sign name or names  exactly as printed above  to authorize the voting  of
your  shares as indicated above. Where  shares are registered with joint owners,
all joint  owners should  sign. Persons  signing as  executors,  administrators,
trustees,  etc. should  so indicate.  Corporate proxies  should be  signed by an
authorized officer.
<PAGE>
                  Sun Life Assurance Company of Canada (U.S.)
                          One Sun Life Executive Park
                      Wellesley Hills, Massachusetts 02181
 
                                                                   April 3, 1996
 
Dear Contract Owner/Participant:
 
A  meeting of  shareholders in  the World Growth  Series of  MFS/Sun Life Series
Trust ("WGS") will  be held  at the  offices of  Sun Life  Assurance Company  of
Canada, One Sun Life Executive Park, Wellesley Hills, Massachusetts on April 29,
1996 at 9:30 a.m.
 
All or part of the variable portion of your Regatta Gold contract is invested in
shares  of WGS. Although you are not a shareholder of WGS, you do have the right
to instruct Sun Life Assurance Company of Canada (U.S.), issuer of the Contract,
as to the  manner in  which the  number of shares  of WGS  attributable to  your
Contract  should be voted. The Insurance Company will follow voting instructions
received at least  one day  prior to  the meeting.  Shares for  which no  timely
voting  instructions are received will be voted  by the Insurance Company in the
same proportion as the shares for  which instructions are received from  persons
having such right.
 
We  have enclosed a  copy of the  Notice of Special  Meeting of Shareholders and
Proxy Statement dated April 3, 1996  and a card entitled "Voting  Instructions".
This card should be used to register your vote on the proposals to be acted upon
at the meeting.
 
YOUR VOTE ON THESE MATTERS IS IMPORTANT. PLEASE COMPLETE THE VOTING INSTRUCTIONS
CARD AND RETURN IT PROMPTLY IN THE ENVELOPE PROVIDED IN ORDER TO ENSURE THAT ALL
SHARES ATTRIBUTABLE TO YOUR CONTRACT ARE VOTED BY THE INSURANCE COMPANY.
 
                                          Sincerely,
                                          John D. McNeil
                                          Chairman
 
Reg Gold
<PAGE>
               Sun Life Insurance and Annuity Company of New York
                                80 Broad Street
                            New York, New York 10004
 
                                                                   April 3, 1996
 
Dear Contract Owner:
 
A  meeting of  shareholders in  the World Growth  Series of  MFS/Sun Life Series
Trust ("WGS") will  be held  at the  offices of  Sun Life  Assurance Company  of
Canada, One Sun Life Executive Park, Wellesley Hills, Massachusetts on April 29,
1996 at 9:30 a.m.
 
All or part of the variable portion of your Regatta-N.Y. contract is invested in
shares  of WGS. Although you are not a shareholder of WGS, you do have the right
to instruct Sun Life Insurance  and Annuity Company of  New York, issuer of  the
Contract,  as to the manner in which the number of shares of WGS attributable to
your Contract  should  be  voted.  The  Insurance  Company  will  follow  voting
instructions received at least one day prior to the meeting. Shares for which no
timely  voting instructions are received will  be voted by the Insurance Company
in the same proportion  as the shares for  which instructions are received  from
persons having such right.
 
We  have enclosed a  copy of the  Notice of Special  Meeting of Shareholders and
Proxy Statement dated April 3, 1996  and a card entitled "Voting  Instructions".
This card should be used to register your vote on the proposals to be acted upon
at the meeting.
 
YOUR VOTE ON THESE MATTERS IS IMPORTANT. PLEASE COMPLETE THE VOTING INSTRUCTIONS
CARD AND RETURN IT PROMPTLY IN THE ENVELOPE PROVIDED IN ORDER TO ENSURE THAT ALL
SHARES ATTRIBUTABLE TO YOUR CONTRACT ARE VOTED BY THE INSURANCE COMPANY.
 
                                          Sincerely,
                                          John D. McNeil
                                          Chairman
 
Reg NY
<PAGE>
MFS/SUN LIFE SERIES TRUST                                    VOTING INSTRUCTIONS
WORLD GROWTH SERIES
 
                 INSTRUCTIONS OF VARIABLE CONTRACT PARTICIPANT
                  FOR VOTING SHARES OF THE WORLD GROWTH SERIES
 
THE BALLOT FOR WHICH VOTING INSTRUCTIONS ARE BEING REQUESTED IS SOLICITED BY THE
BOARD OF TRUSTEES OF MFS/ SUN LIFE SERIES TRUST.
 
The undersigned, being a Participant under a variable annuity contract issued by
Sun  Life Assurance Company of  Canada (U.S.) or Sun  Life Insurance and Annuity
Company of New York  (the "Insurance Company"),  hereby instructs the  Insurance
Company  to cause the shares  of the World Growth  Series of MFS/Sun Life Series
Trust allocable to Participant's account  identified on the reverse side  hereof
to  be voted in the manner specified  below with respect to the matter described
in the accompanying proxy statement.
 
<TABLE>
<C>                                     <S>
FOR / /    AGAINST / /    ABSTAIN /  /  To  approve two new sub-investment advisory  agreements, one between Massachusetts Financial
                                        Services Company ("MFS") and  Foreign & Colonial Management  Limited ("FCM"), and the  other
                                        between  FCM and  its subsidiary,  Foreign &  Colonial Emerging  Markets Limited, containing
                                        substantially the same terms and conditions as the current sub-investment advisory agreement
                                        between MFS and Batterymarch Financial Management, Inc., to become effective on or about May
                                        1, 1996.
</TABLE>
 
<PAGE>
                          (CONTINUED FROM OTHER SIDE)
 
THE INSURANCE COMPANY WILL FOLLOW VOTING INSTRUCTIONS ONLY IF THEY ARE  RECEIVED
AT  LEAST ONE  DAY PRIOR  TO THE  DATE OF  THE MEETING.  IF NO  INSTRUCTIONS ARE
SPECIFIED THE INSURANCE COMPANY WILL VOTE  THE SHARES IN THE SAME PROPORTION  AS
THE SHARES FOR WHICH INSTRUCTIONS ARE RECEIVED FROM PERSONS HAVING SUCH RIGHT.
                                       Dated: ____________________________, 1996
                                       _________________________________________
                                      (Signature of Contract Owner/Participant)
 
                                      Please  date  and  sign  exactly  as  name
                                      appears hereon. Executors, administrators,
                                      trustees, etc.  should  so  indicate  when
                                      signing.
 
                                       PLEASE  MARK, SIGN,  DATE AND  RETURN THE
                                       VOTING INSTRUCTIONS  CARD PROMPTLY  USING
                                       THE ENCLOSED ENVELOPE.


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