GENERAL MOTORS CORP
SC 13D/A, 1998-05-01
MOTOR VEHICLES & PASSENGER CAR BODIES
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                AMENDMENT NO. 1
                                      TO
                                 SCHEDULE 13D


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934


                             PANAMSAT CORPORATION
- --------------------------------------------------------------------------------
                               (Name of Issuer)


                    Common Stock, $.01 par value per share
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)


                                  697933-10-9
- --------------------------------------------------------------------------------
                                (CUSIP Number)


                           Scott B. Tollefsen, Esq.
             Senior Vice President, General Counsel and Secretary
                          Hughes Communications, Inc.
                                1500 Hughes Way
                         Long Beach, California  90810
                                (310) 525-5150
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                                April 30, 1998
- --------------------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is subject of this Schedule 13D, and is filing this
statement because of Rule 13d-1(b)(3) or (4), check the following box: [_].

                       (Continued on the following page)



                              Page 1 of 12 Pages
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 697933-10-9                                    PAGE 2 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    
      GENERAL MOTORS CORPORATION
      TAX I.D. NO. 38-0572515
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4    
      AF
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      DELAWARE
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          120,812,175 SHARES
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             0
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          120,812,175 SHARES
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      120,812,175 SHARES
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                  
                                                                          [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      81.0%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON
14
      CO
- ------------------------------------------------------------------------------
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 697933-10-9                                    PAGE 3 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    
      HUGHES COMMUNICATIONS, INC.
      TAX I.D. NO. 95-3884435
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4    
      AF
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      CALIFORNIA
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          120,812,175 SHARES
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             0
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          120,812,175 SHARES
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      120,812,175 SHARES
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                  
                                                                          [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      81.0%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON
14
      CO
- ------------------------------------------------------------------------------
<PAGE>
 
                                                                    Page 4 of 12


ITEM 1.   SECURITY AND ISSUER.
          ------------------- 

          This statement relates to shares of common stock, par value $.01 per
share (the "Common Stock"), of PanAmSat Corporation, a Delaware corporation (the
"Company").  The principal executive offices of the Company are located at One
Pickwick Plaza, Greenwich, Connecticut 06830.

ITEM 2.   IDENTITY AND BACKGROUND.
          ----------------------- 

          (a)  This statement is being filed jointly by General Motors
Corporation, a Delaware corporation ("GM"), and Hughes Communications, Inc., a
California corporation and an indirect, wholly owned subsidiary of GM ("HCI,"
and together with GM, the "Reporting Persons").  The Reporting Persons are
filing this statement jointly pursuant to a Joint Filing Agreement attached
hereto as Exhibit 1.

          (b)  The address of GM's principal office is 100 Renaissance Center,
Detroit, MI 48265-1000.  The address of HCI's principal office is 1500 Hughes
Way, Long Beach, California 90810.  The names, business addresses and principal
businesses of each of the directors and executive officers of each of GM and HCI
are set forth on Schedule I hereto and incorporated by reference herein.

          (c)  The principal business of GM is manufacturing cars and trucks;
subsidiaries of GM also engage in significant nonautomotive operations.  The
principal business of HCI is the development of satellite-based communications
businesses.

          (d)  During the last five years, none of the Reporting Persons nor, to
the best of their knowledge, any of the executive officers or directors of any
of the Reporting Persons, has been convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors).

          (e)  During the last five years, none of the Reporting Persons nor, to
the best of their knowledge, any of the executive officers or directors of any
of the Reporting Persons, has been a party to a civil proceeding of a judicial
or administrative body of competent jurisdiction and, as a result of such
proceeding, was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.

          (f)  To the best knowledge of the Reporting Persons, each of the
executive officers and directors of the Reporting Persons is a United States
citizen other than Percy Barnevik, a director of GM, who is a citizen of Sweden;
and Eckhard Pfeiffer, a director of GM, who is a citizen of Germany.

ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
          ------------------------------------------------- 

          See Item 4 below.

ITEM 4.   PURPOSE OF TRANSACTION.
          ---------------------- 

          On April 30, 1998, HCI purchased 11,239,594 shares of Common Stock,
representing approximately 7.5% of the total shares of Common Stock (based on
149,150,834 shares outstanding on April 21, 1998), from Satellite Company, LLC,
a Nevada limited liability company ("S Company") and a wholly-owned indirect
subsidiary of Grupo Televisa, S.A., a corporation (Sociedad Anonima) organized
under the laws of Mexico ("Televisa"), in exchange for aggregate cash
consideration of $674,375,640.00 (the "Televisa Purchase Price").
                                       -----------------------   
<PAGE>
 
                                                                    Page 5 of 12

          On May 1, 1998, HCI purchased an aggregate of 2,949,774 shares of
Common Stock, representing approximately 2% of the total shares of Common Stock
outstanding from the following individuals and entities in the amounts
indicated, in exchange for aggregate cash consideration of $176,986,440 (such
individuals and entities are collectively referred to as the "Other PAS
Stockholders"):

<TABLE>
<CAPTION>
              STOCKHOLDER              NO. OF SHARES       PURCHASE PRICE
<S>                                    <C>                 <C>
Mary Anselmo                              137,822           $  8,269,320
Article VII Trust Created Under                                         
   Rene Anselmo Revocable Trust         2,110,708            126,642,480
Chloe Landman Trust                         6,891                413,460
Frederick A. Landman Trust                154,738              9,284,280
Fred Landman                              407,445             24,446,700
Pier Landman                               39,376              2,362,560
Rayce Anselmo Trust                        55,129              3,307,740
Rissa Landman Trust                         6,891                413,460
Lourdes Saralegui                          30,774              1,846,440
</TABLE>

Mr. Landman and Ms. Saralegui are President/Chief Executive Officer and
Executive Vice President of the Company, respectively.

          The funds required to pay the cash consideration to S Company and the
Other PAS Stockholders were contributed to HCI by its parent, Hughes Electronics
Corporation, a Delaware corporation ("HEC"), from HEC's cash on hand.  Certain
of the shares of Common Stock purchased by HCI from S Company were released from
a collateral trust account created in May 1997, and $150,000,000 of the Purchase
Price was deposited into such account as substitute collateral.

          As a result of its purchase of shares from S Company and the Other PAS
Stockholders, HCI and its subsidiaries will own approximately 81.0% of the
outstanding shares of Common Stock. HCI acquired such shares in order to
increase its ownership of the Company to more than 80%, which will allow GM to
include PanAmSat's results of operations in GM's consolidated tax return. HCI
and its affiliates remain subject to certain contractual provisions which
prohibit HCI and its affiliates, for a period of five years from May 16, 1997,
from acquiring more than eighty-one percent (81%) of the outstanding equity
securities of the Company unless certain conditions are satisfied (the
"Standstill Restriction"). The Reporting Persons have no present intention of
acquiring more than eighty-one percent (81%) of the outstanding equity
securities of the Company.

          Except as described herein, none of the Reporting Persons has any
present plan or proposal which relates to, or could result in, any of the events
referred to in paragraphs (a) through (j), inclusive, of Item 4 of Schedule 13D.
However, subject to the Standstill Restriction, the Reporting Persons will
continue to review the business of the Company and, depending upon one or more
of the factors referred to above, may in the future propose that the Company
take one or more of such actions.
<PAGE>
 
                                                                    Page 6 of 12

ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.
          ------------------------------------ 

          (a)  HCI and its subsidiaries are the direct record owners of
120,812,175 shares of the Common Stock, which constitute approximately 81.0% of
the 149,150,834 outstanding shares of the Common Stock as of April 21, 1998.  As
of April 30, 1998, certain executive officers and directors of Reporting Persons
owned an aggregate of approximately 6,400 shares of Common Stock.  The Reporting
Persons disclaim any beneficial interest in such shares.

          (b)  GM, acting through its wholly owned subsidiaries HEC, Hughes
Telecommunications and Space Company, a Delaware corporation, and HCI,
indirectly has sole power to vote or direct the vote, and to dispose or to
direct the disposition of the shares of the Common Stock beneficially owned by
GM.  As a result, GM may be deemed to beneficially own the shares of the Common
Stock directly owned by HCI and its subsidiaries.

          (c)  Except as described in Item 4 above, there have not been any
transactions in the Common Stock effected by or for the account of any of the
Reporting Persons or any executive officer or director of any of the Reporting
Persons during the past 60 days.

          (d)  Except as stated in this Item 5, to the best knowledge of the
Reporting Persons, no other person has the right to receive or the power to
direct the receipt of dividends from, or the proceeds from the sale of, the
shares of Common Stock owned by the Reporting Persons.

          (e)  Not applicable.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR
          RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER.
          ------------------------------------------------------ 

          See Item 4.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.
          -------------------------------- 

     Exhibit 1.     Joint Filing Agreement, dated as of May 1, 1998.

     Exhibit 2.     Stock Purchase Agreement, dated as of April 30, 1998, by and
                    among Hughes Communications, Inc., Grupo Televisa, S.A. and
                    Satellite Company, LLC.

     Exhibit 3.     First Amendment to Amended and Restated Collateral Trust
                    Agreement, dated as of April 30, 1998, by and among PanAmSat
                    Corporation, Hughes Communications, Inc. Satellite Company,
                    LLC, Grupo Televisa, S.A. and IBJ Schroder Bank & Trust
                    Company.

     Exhibit 4.     Stock Purchase Agreement, dated as of May 1, 1998, by and
                    among Hughes Communications, Inc. and the stockholders of
                    PamAmSat Corporation signatory thereto.
<PAGE>
 
                                                                    Page 7 of 12


                                   SIGNATURE

          After reasonable inquiry and to the best of my knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.


Dated:  May 1, 1998                         GENERAL MOTORS CORPORATION
 
 
                                            By: /s/ Martin I. Darvick
                                               ---------------------------------
                                               Name:  Martin I. Darvick
                                               Title:  Assistant Secretary
 



Dated:  May 1, 1998                         HUGHES COMMUNICATIONS, INC.
 
 
 
                                            By: /s/ Patrick T. Doyle
                                               ---------------------------------
                                               Name:  Patrick T. Doyle
                                               Title:  Senior Vice President
<PAGE>
 
                                                                    Page 8 of 12



                                  SCHEDULE I
                      DIRECTORS AND EXECUTIVE OFFICERS OF
                          GENERAL MOTORS CORPORATION


          The name, business address, present principal occupation or
employment, and the name, principal business and address of any corporation or
other organization in which such employment is conducted, of each of the
directors and executive officers of General Motors Corporation is set forth
below.

<TABLE>
<CAPTION>
                                                                          PRINCIPAL OCCUPATION, IF
                                                                          OTHER THAN AS EXECUTIVE
NAME AND BUSINESS                 POSITION WITH GENERAL                   OFFICER OF GENERAL MOTORS
ADDRESS                           MOTORS CORPORATION                      CORPORATION
- -----------------                 ---------------------                   -------------------------
<S>                               <C>                                     <C>
John F. Smith, Jr.                Chairman of the Board, Chief      
General Motors Corporation        Executive Officer, President and                
100 Renaissance Center            Director                                        
Detroit, MI  48243                                                                
                                                                                  
Harry J. Pearce                   Vice Chairman and Director                      
General Motors Corporation                                                        
100 Renaissance Center                                                            
Detroit, MI  48243                                                                

Anne L. Armstrong                 Director                                Chairman of the Board of Trustees        
P.O. Box 1358                                                             Center for Strategic and International                    
Kingsville, Texas 78364                                                   Studies                                                   

                                                                                                                                    

Percy Barnevik                    Director                                Chairman                                                  
ABB Asea Brown Boveri Ltd.                                                ABB Asea Brown Boveri, Ltd.                               
Affolternstrasse 44                                                                                                                 
Box 8131                                                                                                                            
CH-8050 Zurich                                                                                                                      
Switzerland                                                                                                                         


John H. Bryan                     Director                                Chairman and Chief Executive Officer                      
Sara Lee Corporation                                                      Sara Lee Corporation                                      
Three First National Plaza                                                                                                          
46th Floor                                                                                                                          
Chicago, IL  60602                                                                                                                  


Thomas E. Everhart                Director                                Pro-Vice-Chancellor                                       
University of Cambridge                                                   University of Cambridge                                   
The Old Schools                                                                                                                     
Trinity Lane                                                                                                                        
Cambridge CB2-1TN                                                                                                                   
England                                                                                                                             

</TABLE> 
<PAGE>
 
                                                                    Page 9 of 12

<TABLE> 
<CAPTION> 
                                                                          PRINCIPAL OCCUPATION, IF
                                                                          OTHER THAN AS EXECUTIVE
NAME AND BUSINESS                 POSITION WITH GENERAL                   OFFICER OF GENERAL MOTORS
ADDRESS                           MOTORS CORPORATION                      CORPORATION
- -----------------                 ---------------------                   -------------------------
<S>                               <C>                                     <C>
Charles T. Fisher III             Director                                Retired Chairman and President                            
100 Renaissance Center                                                    NBD Bankcorp. Inc.                                        
Suite 3520                                                                                                                          
Detroit, MI  48243                                                                                                                  


George M.C. Fisher                Director                                Chairman and Chief Executive Officer                      
Eastman Kodak Company                                                     Eastman Kodak Company                                     
343 State Street                                                                                                                    
Rochester, NY  14650                                                                                                                


Karen Katen                       Director                                Executive Vice President,                                 
Pfizer Pharmaceuticals Group                                              Pfizer Pharmaceuticals;                                   
Pfizer Inc.                                                               President, U.S. Pharmaceuticals                           
235 East 42nd Street                                                                                                                
New York, NY  10017-5755                                                                                                            


J. Willard Marriott, Jr.          Director                                Chairman and Chief Executive Officer                      
Marriott International Inc.                                               Marriott International, Inc.                              
One Marriott Drive                                                                                                                  
Washington, DC  20058                                                                                                               


Ann D. McLaughlin                 Director                                Chairman                                                  
The Aspen Institute                                                       The Aspen Institute;                                      
1333 New Hampshire Ave., N.W.                                             President,                                                
Suite 1070                                                                Federal City Council                                      
Washington, DC  20036                                                                                                               


Eckhard Pfeiffer                  Director                                President and Chief Executive Officer                     
Compaq Computer Corporation                                               Compaq Computer Corporation                               
20555 S.H. 249                                                                                                                      
Houston, TX  77070-2000                                                                                                             


John G. Smale                     Director                                Chairman,                                                 
The Procter & Gamble Company                                              GM Executive Committee;                                   
P.O. Box 599                                                              Retired Chairman,                                         
Cincinnati, Ohio  45201-0599                                              The Procter & Gamble Company                              


Louis W. Sullivan, M.D.           Director                                President                                                 
Morehouse School of Medicine                                              Morehouse School of Medicine                              
720 Westview Drive S.W.                                                                                                             
Atlanta, GA  30310-1495                                                                                                             


Dennis Weatherstone               Director                                Retired Chairman and current director,                    
J.P. Morgan & Co. Inc.                                                    J.P. Morgan & Co. Inc.                                    
60 Wall Street, 21st Floor                                                                                                          
New York, NY  10260                                                                                                                 

</TABLE> 
<PAGE>
 
                                                                   Page 10 of 12

<TABLE> 
<CAPTION> 
                                                                          PRINCIPAL OCCUPATION, IF
                                                                          OTHER THAN AS EXECUTIVE
NAME AND BUSINESS                 POSITION WITH GENERAL                   OFFICER OF GENERAL MOTORS
ADDRESS                           MOTORS CORPORATION                      CORPORATION
- -----------------                 ---------------------                   -------------------------
<S>                               <C>                                     <C>
Thomas H. Wyman                   Director                                Former Chairman, President and Chief                      
The Landings                                                              Executive Officer                                         
1 Adams Point                                                             CBS, Inc.;                                                
Savannah, GA  31411                                                       Former Senior Advisor,
                                                                          SBC Warburg Inc.;                                         
                                                                          Former Chairman,                                          
                                                                          S.G. Warburg & Co.                                        

J.T. Battenberg III               Executive Vice President and            
General Motors Corporation        President of Delphi Automotive          
5725 Delphi Drive                 Systems                                 
Troy, MI  48098-2815                                                      
                                                                          
                                                                          
Louis R. Hughes                   Executive Vice President and            
General Motors International      President of International              
 Operations                       Operations                              
Postfach                                                                  
CH-8152 Glattbrugg                                                        
Switzerland                                                               
                                                                          
J. Michael Losh                   Executive Vice President and            
General Motors Corporation        Chief Financial Officer                 
100 Renaissance Center                                                    
Detroit, MI  48243                                                        
                                                                          
G. Richard Wagoner                Executive Vice President and            
General Motors Corporation        President of North American             
30400 Mound Road                  Operations                              
Warren, MI  48090-9015
</TABLE>
<PAGE>
 
                                                                   Page 11 of 12


                      DIRECTORS AND EXECUTIVE OFFICERS OF
                          HUGHES COMMUNICATIONS, INC.

          The name, business address, present principal occupation or
employment, and the name, principal business and address of any corporation or
other organization in which such employment is conducted, of each of the
directors and executive officers of Hughes Communications, Inc.

<TABLE>
<CAPTION>
                                                                          PRINCIPAL OCCUPATION, IF
                                                                          OTHER THAN AS EXECUTIVE
NAME AND BUSINESS                      POSITION WITH HUGHES               OFFICER OF HUGHES
ADDRESS                                COMMUNICATIONS, INC.               COMMUNICATIONS, INC.
- -----------------                      --------------------               ------------------------
<S>                                    <C>                                <C>
Charles H. Noski                       Director                           President of Hughes Electronics     
Hughes Electronics Corporation                                            Corporation                                          
200 North Sepulveda Blvd.                                                                                                      
El Segundo, CA  90245                                                                                                          
                                                                                                                               
Frank A. Taormina                      President                                                                               
Hughes Communications, Inc.                                                                                                    
1500 Hughes Way                                                                                                                
Long Beach, CA  90810-9928                                                                                                     

Patrick T. Doyle                       Senior Vice President              Vice President of Hughes Electronics                 
Hughes Electronics Corporation                                            Corporation                                          
200 North Sepulveda Blvd.                                                                                                      
El Segundo, CA  90245                                                                                                          
                                                                                                                               
Michael J. Gaines                      Senior Vice President              Controller of Hughes Electronics                     
Hughes Electronics Corporation                                            Corporation                                          
200 North Sepulveda Blvd.                                                                                                      
El Segundo, CA  90245                                                                                                          
                                                                                                                               
Scott B. Tollefsen                     Senior Vice President, General                                                          
Hughes Communications, Inc.            Counsel and Secretary                                                                   
1500 Hughes Way                                                                                                                
Long Beach, CA  90810-9928                                                                                                     
                                                                                                                               
Grant J. Beatson                       Chief Financial Officer            Vice President of Hughes                             
Hughes Electronics Corporation                                            Telecommunications & Space Company                   
200 North Sepulveda Blvd.
El Segundo, CA  90245
</TABLE>
<PAGE>
 
                                                                   Page 12 of 12

                                 EXHIBIT INDEX
                                 -------------

Exhibit 1.     Joint Filing Agreement, dated as of April 30, 1998.

Exhibit 2.     Stock Purchase Agreement, dated as of April 30, 1998, by and
               among Hughes Communications, Inc., Grupo Televisa, S.A. and
               Satellite Company, LLC.

Exhibit 3.     First Amendment to Amended and Restated Collateral Trust
               Agreement, dated as of April 30, 1998, by and among PanAmSat
               Corporation, Hughes Communications, Inc., Satellite Company, LLC,
               Grupo Televisa, S.A. and IBJ Schroder Bank & Trust Company.

Exhibit 4.     Stock Purchase Agreement, dated as of May 1, 1998, by and among
               Hughes Communications, Inc., and the stockholders of PamAmSat
               Corporation signatory thereto.

<PAGE>
 
                                                                       EXHIBIT 1

                            JOINT FILING AGREEMENT
                            ----------------------
                                        
          The undersigned hereby agree to jointly file a statement on Schedule
13D, together with any amendments thereto (collectively, the "Schedule 13Ds"),
with the Securities and Exchange Commission pursuant to the requirements of Rule
13d-1(f) under the Securities Exchange Act of 1934, as amended.

          This Joint Filing Agreement may be signed in counterpart copies.


                           (Signature Page Follows)
<PAGE>
 
Date:  May 1, 1998                          GENERAL MOTORS CORPORATION
 
 
 
                                            By:  /s/ Martin I. Darvick
                                                --------------------------------
                                            Name:  Martin I. Darvick
                                            Title: Assistant Secretary
 


Date:  May 1, 1998                          HUGHES COMMUNICATIONS, INC.
 
 
 
                                            By:  /s/ Patrick T. Doyle
                                                --------------------------------
                                            Name:  Patrick T. Doyle
                                            Title: Senior Vice President

<PAGE>
 
                                                                       EXHIBIT 2


                           STOCK PURCHASE AGREEMENT

          This Stock Purchase Agreement, dated as of April 30, 1998 (this
"Agreement"), is made and entered into by Hughes Communications, Inc., a
- ----------                                                              
California corporation ("HCI"), Grupo Televisa, S.A., a corporation (Sociedad
                         ---                                                 
Anonima) organized under the laws of Mexico ("Televisa"), and Satellite Company,
                                              --------                          
LLC, a Nevada limited liability company and a wholly-owned subsidiary of
Televisa ("S Company").
           ---------   

          WHEREAS, on May 16, 1997, HCI and certain of its subsidiaries, S
Company and PanAmSat International Systems, Inc. (formerly known as PanAmSat
Corporation), a Delaware corporation ("PAS"), consummated a reorganization of
                                       ---                                   
the respective satellite services businesses of HCI and PAS in which HCI and its
subsidiaries and S Company acquired shares of common stock, $.01 par value per
share ("Common Stock"), of PanAmSat Corporation (formerly known as Magellan
        ------------                                                       
International, Inc.), a Delaware corporation (the "Company"), representing
                                                   -------                
approximately 71.5% and 7.5%, respectively, of the total shares of Common Stock
currently outstanding.

          WHEREAS, Televisa and S Company have advised HCI that S Company
desires to sell all its 11,239,594 shares of Common Stock (the "Shares") for the
                                                                ------          
consideration and on the terms set forth in this Agreement.

          WHEREAS, the Shares to be purchased by HCI include 5,000,000 Shares
(the "Pledged Shares") currently held in trust pursuant to that certain Amended
      --------------                                                           
and Restated Collateral Trust Agreement, dated as of June 13, 1997, by and among
the Company, HCI, S Company, Televisa and IBJ Schroder Bank & Trust Company (the
"Trust Agreement"), which agreement is being amended (the "Trust Agreement
 ---------------                                           ---------------
Amendment") concurrently herewith to allow the release of the Pledged Shares.
- ---------                                                                    

          WHEREAS, concurrently with the execution and delivery of this
Agreement, and as a material inducement to Hughes Electronics Corporation
("HEC"), the sole stockholder of HCI, to cause HCI to enter into this Agreement,
  ---                                                                           
Televisa is delivering a Certificate containing certain representations and
obligations of Televisa.

          WHEREAS, HCI desires to purchase all the Shares for the consideration
and on the terms set forth in this Agreement.

          NOW, THEREFORE, the parties intending to be legally bound, agree as
follows:

     1.   Purchase of Shares.
          ------------------ 

          HCI hereby agrees to purchase from S Company, and S Company hereby
agrees to sell, assign and transfer to HCI, all of S Company's interest in and
to the Shares.  As soon as practicable following execution of this Agreement
(but in no event later than 12:00 p.m., New York time, on Friday, May 1, 1998),
HCI shall pay to S Company $674,375,640.00 (representing the number of Shares
multiplied by Sixty Dollars ($60.00)) (the "Purchase Price"), of which
                                            --------------            
<PAGE>
 
$524,375,640 shall be wire transferred in immediately available funds to an
account designated by S Company and $150,000,000.00 shall be wire transferred in
immediately available funds on behalf of S Company to an account designated by
the Trustee under the Trust Agreement as substitute collateral for the Pledged
Shares (the "Substitute Cash Collateral").  Immediately upon confirmation of S
             --------------------------                                       
Company's receipt of $524,375,640, S Company shall deliver to a designated
representative of HCI all certificates representing the Shares, other than the
Pledged Shares, along with such other documentation reasonably satisfactory to
HCI evidencing the transfer of such Shares.  Pursuant to the terms of the Trust
Agreement Amendment, the trustee under the Trust Agreement shall, immediately
upon receipt of the Substitute Cash Collateral, deliver to a designated
representative of HCI the certificate or certificates representing the Pledged
Shares.

     2.   Representations and Warranties of Televisa and S Company.
          -------------------------------------------------------- 

          Each of Televisa and S Company hereby represents and warrants as of
the date hereof, on a joint and several basis, that:

          (a)  Organization.  Each of Televisa and S Company is duly organized,
               ------------                                                    
validly existing and (if applicable) in good standing under the laws of its
respective jurisdiction of formation.  Each of Televisa and S Company has all
requisite power and authority to carry on its business as now conducted.
Neither Televisa nor S Company (i) has been dissolved, adopted resolutions to
dissolve or acted in any way to accomplish, request or approve such dissolution,
or (ii) is a party to any merger or (iii) has been declared bankrupt and no
action or request is pending to declare it bankrupt.

          (b)  Ownership of S Company.  Televisa is, indirectly, the owner of
               ----------------------                                        
all outstanding membership interests of S Company.

          (c)  Authorization.  Each of Televisa and S Company has taken all 
               -------------   
action necessary for the authorization, execution, delivery and performance of
this Agreement and the consummation of the transactions contemplated hereby.
This Agreement constitutes the valid and legally binding obligation of each of
Televisa and S Company, enforceable against each of them in accordance with its
terms.

          (d)  Ownership of the Shares.  S Company has good title to the 
               -----------------------   
Shares; has full, complete and unrestricted legal right, power and authority to
transfer and deliver, or cause to be transferred and delivered, the Shares
pursuant to this Agreement; and HCI is receiving good title thereto, free and
clear of all liens, claims, encumbrances, rights and restrictions of any kind
(other than restrictions created or imposed by HCI or its affiliates or federal
or state securities laws).

          (e)  Non-Contravention.  The execution and delivery by each of 
               -----------------   
Televisa and S Company of this Agreement does not, and the performance of its
obligations hereunder will 

                                       2
<PAGE>
 
not, (i) contravene or conflict with any provision of the respective
organizational documents of Televisa and S Company, or (ii) contravene or
conflict with or constitute a violation of or default under or give rise to a
right of termination, cancellation or acceleration (with or without notice or
lapse of time, or both) of any right or obligation of Televisa or S Company
under any provision of applicable law or regulation of the United States or any
state thereof or any foreign jurisdiction, or of any agreement, injunction,
order, decree or other instrument binding upon Televisa or S Company.

          (f)  No Consent Required.  Except as contemplated by the Trust 
               -------------------   
Agreement Amendment, no application, notice, order, registration, qualification,
waiver, consent, approval or other action is required to be filed, given,
obtained or taken by Televisa or S Company by virtue of the execution, delivery
and performance of this Agreement or the sale of the Shares contemplated hereby.

          (g)  Compliance with Securities Laws.  Each of Televisa and S Company
               -------------------------------                                 
acknowledges that the Shares are being sold to HCI in a private transaction that
is exempt from registration under the Securities Act of 1933, as amended.  Each
of Televisa and S Company believes that it has received all the information that
it considers necessary or appropriate for deciding whether to sell the Shares,
and represents that it has had an opportunity to ask questions of, and has
received answers from, representatives of the Company regarding material
developments affecting the Company and its prospects.  Neither Televisa nor S
Company has taken any action with respect to the Shares that would constitute a
violation of federal or state securities laws.

     3.   HCI's Representations and Warranties.
          ------------------------------------ 

          HCI hereby represents and warrants as of the date hereof that:

          (a)  Organization.  HCI is a corporation duly organized, validly 
               ------------   
existing and in good standing under the laws of the state of California.  HCI
has all requisite power and authority to carry on its business as now conducted.

          (b)  Authorization.  HCI has taken all action necessary for the
               -------------                                             
authorization, execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby.  This Agreement
constitutes HCI's valid and legally binding obligation, enforceable in
accordance with its terms.

          (c)  Non-Contravention.  The execution and delivery by HCI of this
               -----------------                                            
Agreement does not, and the performance of its obligations hereunder will not,
(i) contravene or conflict with the certificate of incorporation or bylaws of
HCI, or (ii) contravene or conflict with or constitute a violation of or default
under or give rise to a right of termination, cancellation or acceleration (with
or without notice or lapse of time, or both) of any right or obligation of HCI
under any provision of applicable law or regulation of the United States or any
state thereof or 

                                       3
<PAGE>
 
any foreign jurisdiction, or of any agreement, contract, judgment, injunction,
order, decree or other instrument binding upon HCI.

          (d)  No Consent Required.  No application, notice, order, 
               -------------------   
registration, qualification, waiver, consent, approval or other action is
required to be filed, given, obtained, or taken by HCI by virtue of the
execution, delivery and performance of this Agreement or the sale of the Shares
contemplated hereby.

          (e)  Compliance with Securities Laws.  HCI acknowledges that the 
               -------------------------------   
Shares are being purchased by HCI in a private transaction that is exempt from
registration under the Securities Act of 1933, as amended, and HCI believes that
it has received all the information that it considers necessary or appropriate
for deciding whether to purchase the Shares.  HCI has not taken and will not
take any action with respect to the Shares that would constitute a violation of
federal or state securities laws.

     4.   Miscellaneous.
          ------------- 

          (a)  Expenses.  All costs and expenses incurred in connection with 
               --------   
this Agreement and the purchase of the Shares contemplated hereby shall be paid
by the party incurring such expenses.

          (b)  Entire Agreement.  This Agreement and the Trust Agreement 
               ----------------   
Amendment constitute the entire Agreement among the parties hereto and
supercedes all prior agreements and understandings, both written and oral, among
them with respect to the subject matter hereof. This Agreement is not intended
to confer upon any person other than the parties hereto any rights or remedies
hereunder.

          (c)  Governing Law.  This Agreement shall be construed and 
               -------------   
interpreted, and the rights of the parties determined, in accordance with the
laws of the State of New York (without reference to the choice of law
provisions).

          (d)  Service of Process.  Each of the parties hereto irrevocably 
               ------------------   
consents to the service of any process, pleading, notices or other papers by the
mailing of copies thereto by registered, certified or first class mail, postage
prepaid, to such party at such party's address set forth herein, or by any other
method provided or permitted under New York law. Additionally, each of Televisa,
S Company and HCI hereby appoints C T Corporation System, 1633 Broadway, New
York, NY 10019 as agent for service of process in New York.

          (e)  Consent and Jurisdiction.  Each party irrevocably and 
               ------------------------   
unconditional agrees and consents that any suit, action or other legal
proceeding arising out of or related this Agreement shall be brought and heard
in the Borough of Manhattan, State of New York, and each party irrevocably
consents to personal jurisdiction in any and all tribunals in said Borough.

                                       4
<PAGE>
 
          (f)  Injunctive Relief.  Televisa and S Company acknowledge that it 
               -----------------   
will be impossible to measure in money the damages that would be suffered if
Televisa and S Company fail to comply with any of the obligations herein imposed
on them and that in the event of any such failure, HCI will be irreparably
damaged and will not have an adequate remedy at law. HCI shall, therefore, be
entitled to injunctive relief, including specific performance, to enforce such
obligations, and if any action should be brought in equity to enforce any of the
provisions of this Agreement, neither Televisa nor S Company shall raise the
defense that there is an adequate remedy at law.

          (g)  Counterparts.  This Agreement may be executed in two or more
               ------------                                                
counterparts, all of which shall be considered one and the same instrument and
shall become effective when executed and delivered by each of the parties.

                                       5
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Stock Purchase
Agreement to be signed by their respective officers and other representatives
thereunto duly authorized, as of the date first written above.

                                  GRUPO TELEVISA, S.A.

                                  By:  /s/ Emilio Romano
                                       -----------------------------------------
                                       Name:  Emilio Romano
                                       Title:  Vice President

                                  SATELLITE COMPANY, LLC

                                  By:  /s/ Charles Steinberg
                                       -----------------------------------------
                                       Name:  Charles Steinberg
                                       Title:  Vice President & General Counsel

                                  HUGHES COMMUNICATIONS, INC.

                                  By:  /s/ Patrick T. Doyle
                                       -----------------------------------------
                                       Name:  Patrick T. Doyle
                                       Title:  Senior Vice President

                                       6

<PAGE>
 
                               FIRST AMENDMENT TO
                AMENDED AND RESTATED COLLATERAL TRUST AGREEMENT

          This FIRST AMENDMENT TO AMENDED AND RESTATED COLLATERAL TRUST
AGREEMENT (the "Amendment"), dated as of April 30, 1998, is entered into by and
                ---------                                                      
among PanAmSat Corporation (formerly known as "Magellan International, Inc."), a
Delaware corporation ("Newco"), Hughes Communications, Inc., a California
                       -----                                             
corporation ("HCI," and together with Newco, the "Newco Group"), Satellite
              ---                                 -----------             
Company, LLC, a Nevada limited liability company ("Contributor"), Grupo
                                                   -----------         
Televisa, S.A., a corporation (Sociedad Anonima) organized under the laws of
Mexico ("Parent"), and IBJ Schroder Bank & Trust Company, a New York banking
         ------                                                             
corporation with offices at One State Street, New York, New York 10004, as
Collateral Trustee for Newco Group (the "Trustee").
                                         -------   

                                    RECITALS

      A.  The parties have entered into that certain Collateral Trust Agreement,
dated as of May 16, 1997 and that certain Amended and Restated Collateral Trust
Agreement, dated as of June 13, 1997 (the "Amended Trust Agreement"), and
                                           -----------------------       
Contributor, Parent and the Trustee have entered into that certain Pledge and
Security Agreement, dated as of May 16, 1997 (the "Pledge and Security
                                                   -------------------
Agreement").
- ---------

      B.  The Original Trust Agreement was entered into in connection with that
certain Stock Contribution and Exchange Agreement, dated as of September 20,
1996 by and among Newco Group, Contributor and Parent (the "Stock Contribution
                                                            ------------------
and Exchange Agreement"), which provided, among other things, for the transfer
- ----------------------                                                        
by Contributor of all of the stock of Univisa, Inc. ("Univisa"), a Delaware
                                                      -------              
corporation, to Newco.

      C.  The Stock Contribution and Exchange Agreement provides that
Contributor and Parent, jointly and severally, shall indemnify, save and hold
harmless Newco Group, its affiliates and Subsidiaries, with respect to certain
matters upon the terms and subject to the conditions provided in the Stock
Contribution and Exchange Agreement and that as security therefor (and not in
lieu thereof) a trust estate shall be established for the protection of Newco
Group, its affiliates and Subsidiaries.  This trust estate was established
pursuant to the Original Trust Agreement, and was continued pursuant to the
Amended Trust Agreement.

      D.  Concurrently with entering into this Amendment, HCI, Parent and
Contributor are entering into a Stock Purchase Agreement (the "Stock Purchase
                                                               --------------
Agreement") pursuant to which HCI will purchase (the "Purchase") from
- ---------                                             --------       
Contributor 11,239,594 shares of Newco (the "Shares"), including 5,000,000
                                             ------                       
Shares currently held by the Trustee pursuant to the Amended Trust Agreement
(the "Pledged Shares").
      --------------   

      E.  In connection with consummating the Purchase, HCI, Contributor and
Parent desire to substitute $150,000,000.00 in cash for the Pledged Shares.  The
parties to this Amendment are willing to amend the Amended Trust Agreement in
accordance with the terms and provisions contained herein.
<PAGE>
 
                                   AGREEMENT

          In consideration of the foregoing and the mutual promises contained
herein and for other good and valuable consideration the receipt and adequacy of
which are hereby acknowledged, the parties, intending to be legally bound,
hereby agree as follows:

      1.  Capitalized terms used but not defined in this Amendment shall have
the meanings set forth in the Amended Trust Agreement.

      2.  Notwithstanding anything to the contrary in the Amended Trust
Agreement or the Pledge and Security Agreement, immediately following payment to
Contributor of the purchase price for the Shares under the Stock Purchase
Agreement, Contributor shall cause to be delivered to the Trustee, and the
Trustee shall accept receipt of, $150,000,000.00 in cash (the "Substituted
                                                               -----------
Cash") (which amount shall represent a portion of the purchase price paid by HCI
- ----
for the Shares) and, immediately upon confirmation of the Trustee's receipt of
the Substituted Cash, the Trustee shall deliver to HCI the certificate or
certificates representing all the Pledge Shares.

      3.  Upon the Trustee's receipt of the Substituted Cash, each of the
Trustee, Contributor and Parent shall cease to have any interest in or rights
with respect to the Pledged Shares, and thereafter Fund B shall be comprised
solely of (i) the Substituted Cash and (ii) the Initial Letter of Credit issued
on June 13, 1997 (and any replacement or substitution thereof).

      4.  Following the Trustee's receipt of the Substituted Cash, neither
Contributor nor Parent shall be entitled at any time to resubstitute any or all
of the Substituted Cash for shares of Common Stock or any other securities other
than Cash Equivalents (it being understood that the foregoing shall not prohibit
the substitution or resubstitution of Letters of Credit pursuant to the terms of
the Amended Trust Agreement).

      5.  References in the Amended Trust Agreement to "the date hereof" shall,
except in the definition of "Initial Letters of Credit," be deemed references to
"May 16, 1997."

      6.  Neither entry into this Amendment nor consummation of any of the
transactions contemplated hereby shall adversely affect in any respect the
security interest granted to Secured Party in the Collateral not released hereby
(as such terms are defined in the Pledge and Security Agreement).

      7.  The Trustee shall not be liable for actions taken hereunder, and shall
be indemnified by Newco Group, Contributor and Parent, jointly and severally,
for any loss, liability or expense incurred as a result of actions taken
hereunder without bad faith, gross negligence or willful misconduct on the part
of the Trustee, to the full extent set forth in Sections 13 and 14 of the
Amended Trust Agreement.

      8.  Except as expressly set forth herein, none of the rights of the
parties under the Amended Trust Agreement shall be affected in any respect by
this Amendment.

      9.  This Amendment may be executed in two or more counterparts, each of
which will be considered one and the same instrument and shall become effective
when executed and delivered by each of the parties.

                                       2
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be signed by their respective officers and other representatives thereunto duly
authorized, as of the date first written above.

                       PANAMSAT CORPORATION, a Delaware corporation

                       By: /s/ Lourdes Saralegui
                          ----------------------
                          Name:  Lourdes Saralegui
                          Title: Executive Vice President

                       HUGHES COMMUNICATIONS, INC., a California corporation

                       By: /s/ Patrick T. Doyle
                          ---------------------
                          Name:  Patrick T. Doyle
                          Title: Senior Vice President

                       SATELLITE COMPANY, LLC, a Nevada limited liability
                       company

                       By: /s/ Charles Steinberg
                          ----------------------
                          Name:  Charles Steinberg
                          Title: Vice President & General Counsel

                       GRUPO TELEVISA, S.A., a corporation (Sociedad Anonima)
                       organized under the laws of Mexico

                       By: /s/ Emilio Romano
                          ------------------
                          Name:  Emilio Romano
                          Title: Vice President

                       IBJ SCHRODER BANK & TRUST COMPANY, a New York banking
                       corporation

                       By: /s/ Thomas McCutcheon
                          ----------------------
                          Name:  Thomas McCutcheon
                          Title: Assistant Vice President

                                      S-1

<PAGE>
 
                                                                       EXHIBIT 4


                            STOCK PURCHASE AGREEMENT

          This Stock Purchase Agreement, dated as of May 1, 1998 (this
                                                                      
"Agreement"), is made and entered into by Hughes Communications, Inc., a
- ----------                                                              
California corporation ("HCI"), and the selling stockholders whose names appear
                         ---                                                   
on the signature pages to this Agreement (the "Sellers").
                                               -------   

          WHEREAS, on May 16, 1997, HCI and certain of its subsidiaries,
Satellite Company, LLC, a Nevada limited liability company, and PanAmSat
International Systems, Inc. (formerly known as PanAmSat Corporation), a Delaware
corporation ("PAS"), consummated a reorganization of the respective satellite
              ---                                                            
services businesses of HCI and PAS in which HCI and its subsidiaries and the
Sellers acquired shares of common stock, $.01 par value per share ("Common
                                                                    ------
Stock"), of PanAmSat Corporation (formerly known as Magellan International,
Inc.), a Delaware corporation (the "Company").
                                    -------   

          WHEREAS, each of the Sellers has offered to sell to HCI, and HCI
desires to purchase from each of the Sellers, the number of shares of Common
Stock set forth next to the name of such Seller on Annex A (collectively, the
"Shares") for the consideration and on the terms set forth in this Agreement.
- -------                                                                      

          NOW, THEREFORE, the parties intending to be legally bound, agree as
follows:

     1.   Purchase of Shares.
          ------------------ 

          HCI hereby purchases from each of the Sellers, and each of the Sellers
hereby sells, assigns and transfers to HCI, the number of Shares set forth next
to the name of such Seller on Annex A.  Concurrently with such assignment and
transfer, HCI is simultaneously paying to each Seller, by wire transfer of
immediately available funds to the account specified for such Seller on Annex B,
an amount equal to the number of Shares being sold by such Seller multiplied by
Sixty Dollars ($60.00).  Concurrently with the payment of such funds, each
Seller is delivering to HCI certificates representing the Shares being sold by
such Seller with documentation satisfactory to HCI evidencing the transfer of
such Shares.

     2.   Representations and Warranties of the Sellers.
          --------------------------------------------- 

          Each of the Sellers hereby represents and warrants (but only as to
such Seller) as of the date hereof that:

          Organization.  If such Seller is not a natural person, it is duly
          ------------                                                     
organized, validly existing and (if applicable) in good standing under the laws
of its respective jurisdiction of formation; has not been dissolved, adopted
resolutions to dissolve or acted in any way to accomplish, request or approve
such dissolution; is not a party to any merger; and has not been declared
bankrupt and no action or request is pending to declare it bankrupt.
<PAGE>
 
          (b)   Authorization.  If such Seller is not a natural person, it has
                -------------
taken all action necessary for the authorization, execution, delivery and
performance of this Agreement and the consummation of the transactions
contemplated hereby. This Agreement constitutes the valid and legally binding
obligation of such Seller, enforceable against such Seller in accordance with
its terms.

          (c)   Ownership of the Shares.  Such Seller has good title to the
                -----------------------
Shares being sold by such Seller; has full, complete and unrestricted legal
right, power and authority to transfer and deliver such Shares pursuant to this
Agreement; and HCI is receiving good title thereto, free and clear of all liens,
claims, encumbrances, rights and restrictions of any kind other than
restrictions imposed by securities laws and restrictions applicable to such
Shares pursuant to agreements to which HCI is also a party.

          (d)   Non-Contravention.  The execution and delivery of this Agreement
                -----------------
by such Seller does not, and the performance of its obligations hereunder will
not, (i) if such Seller is not a natural person, contravene or conflict with any
provision of the respective organizational documents of such Seller, or (ii)
contravene or conflict with or constitute a violation of or default under or
give rise to a right of termination, cancellation or acceleration (with or
without notice or lapse of time, or both) of any right or obligation of such
Seller under any provision of applicable law or regulation of the United States
or any state thereof or any foreign jurisdiction, or of any agreement,
injunction, order, decree or other instrument binding upon such Seller if such
contravention, conflict, violation, default or rights could adversely affect
HCI's rights to the Shares being sold by such Seller.

          (e)   No Consent Required.  No application, notice, order,
                -------------------
registration, qualification, waiver, consent, approval or other action is
required to be filed, given, obtained or taken by such Seller by virtue of the
execution, delivery and performance of this Agreement or the sale of the Shares
by such Seller contemplated hereby.

          (f)   Compliance with Securities Laws.  Such Seller acknowledges that
                -------------------------------
the Shares are being sold to HCI in a private transaction that is exempt from
registration under the Securities Act of 1933, as amended. Such Seller, either
on its own or through Patrick Costello, acting as a Representative for such
Seller, (i) believes that it has received all the information that it considers
necessary or appropriate for deciding whether to sell the Shares being sold by
such Seller, and (ii) represents that it has had an opportunity to ask questions
of, and has received answers from, representatives of the Company regarding
material developments affecting the Company and its prospects. Such Seller has
not taken any action with respect to the Shares being sold by such Seller that
would constitute a violation of federal securities laws.

                                       2
<PAGE>
 
     3.   HCI's Representations and Warranties.
          ------------------------------------ 

          HCI hereby represents and warrants as of the date hereof that:

          (a)   Organization.  HCI is a corporation duly organized, validly
                ------------
existing and in good standing under the laws of the state of California. HCI has
all requisite power and authority to carry on its business as now conducted. HCI
has not been dissolved, adopted resolutions to dissove or acted in any way to
accomplish, request or approve such dissolution; is not a party to any merger;
and has not been declared bankrupt and no action or request is pending to
declare it bankrupt.

          (b)   Authorization.  HCI has taken all action necessary for the
                -------------
authorization, execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby.  This Agreement
constitutes HCI's valid and legally binding obligation, enforceable in
accordance with its terms.

          (c)   Non-Contravention.  The execution and delivery by HCI of this
                -----------------                                            
Agreement does not, and the performance of its obligations hereunder will not,
(i) contravene or conflict with the certificate of incorporation or bylaws of
HCI, or (ii) contravene or conflict with or constitute a violation of or default
under or give rise to a right of termination, cancellation or acceleration (with
or without notice or lapse of time, or both) of any right or obligation of HCI
under any provision of applicable law or regulation of the United States or any
state thereof or any foreign jurisdiction, or of any agreement, contract,
judgment, injunction, order, decree or other instrument binding upon HCI.

          (d)   No Consent Required.  No application, notice, order,
                -------------------
registration, qualification, waiver, consent, approval or other action is
required to be filed, given, obtained, or taken by HCI by virtue of the
execution, delivery and performance of this Agreement or the purchase of the
Shares contemplated hereby.

          (e)   Compliance with Securities Laws.  HCI acknowledges that the
                -------------------------------
Shares are being purchased by HCI in a private transaction that is exempt from
registration under the Securities Act of 1933, as amended, HCI is acquiring the
Shares as an investment and not with a view toward distribution, and HCI
believes that it has received all the information that it considers necessary or
appropriate for deciding whether to purchase the Shares. HCI acknowledges that
it has not relied on any information with respect to the Company from any of the
Sellers or from any representative or agent of any of the Sellers. HCI has not
taken and will not take any action with respect to the Shares that would
constitute a violation of federal or state securities laws.

      4.  Miscellaneous.
          ------------- 

                                       3
<PAGE>
 
          (a)   Expenses.  All costs and expenses incurred in connection with
                --------
this Agreement and the purchase of the Shares contemplated hereby shall be paid
by the party incurring such expenses.

          (b)   Entire Agreement.  This Agreement constitutes the entire
                ----------------
Agreement among the parties hereto and supercedes all prior agreements and
understandings, both written and oral, among them with respect to the subject
matter hereof. This Agreement is not intended to confer upon any person other
than the parties hereto any rights or remedies hereunder.

          (c)   Governing Law.  This Agreement shall be construed and
                -------------
interpreted, and the rights of the parties determined, in accordance with the
laws of the State of New York (without reference to the choice of law
provisions).

          (d)   Counterparts.  This Agreement may be executed in two or more
                ------------                                                
counterparts, all of which shall be considered one and the same instrument and
shall become effective when executed and delivered by each of the parties.

                                       4
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Stock Purchase
Agreement to be signed as of the date first written above.

                              HUGHES COMMUNICATIONS, INC.

                              By: /s/ Patrick T. Doyle
                                 ---------------------
                                 Name:  Patrick T. Doyle
                                 Its:   Senior Vice President



                              SELLERS

                              /s/ Mary Anselmo
                             -------------------------
                              Mary Anselmo




                              /s/ Frederick A. Landman
                              ------------------------
                              Frederick A. Landman




                              /s/ Pier Landman
                              ------------------------
                              Pier Landman




                             /s/ Lourdes Saralegui
                             -------------------------
                             Lourdes Saralegui

                                       5
<PAGE>
 
                             FORMER CLASS A STOCKHOLDERS




                             /s/ Mary Anselmo
                             ---------------------------------------------------
                             Name: MARY ANSELMO, as a trustee of the Article VII
                                   Trust created by the RENE ANSELMO REVOCABLE
                                   TRUST DATED JUNE 10, 1994 and as successor
                                   trustee under the Voting Trust Agreement
                                   dated as of February 28, 1995 and as a co-
                                   trustee of the RAYCE ANSELMO TRUST DATED
                                   DECEMBER 23, 1991





                             ---------------------------------------------------
                             Name: FREDERICK A. LANDMAN, as trustee of the
                                   Article VII Trust created by the RENE ANSELMO
                                   REVOCABLE TRUST DATED JUNE 10, 1994 and as
                                   successor trustee under the Voting Trust
                                   Agreement dated as of February 28, 1995

                                   

                             /s/ Lourdes Saralegui
                             ---------------------------------------------------
                             Name: LOURDES SARALEGUI, as trustee of the Article
                                   VII Trust created by the RENE ANSELMO
                                   REVOCABLE TRUST DATED JUNE 10, 1994 and as a
                                   successor trustee under the Voting Trust
                                   Agreement dated as of February 28, 1995

                                       6
<PAGE>
 
                             /s/ Pier Landman
                             ---------------------------------------------------
                             Name: PIER LANDMAN, as the sole trustee of the
                                   CHLOE LANDMAN TRUST DATED JUNE 10, 1988 and
                                   the sole trustee of the RISSA LANDMAN TRUST
                                   DATED JUNE  10, 1988




                             /s/ Patrick J. Costello
                             ---------------------------------------------------
                             Name: PATRICK J. COSTELLO, as trustee of the
                                   FREDERICK A. LANDMAN IRREVOCABLE TRUST DATED
                                   DECEMBER 22, 1995 and as a successor trustee
                                   of the RAYCE ANSELMO TRUST DATED DECEMBER 23,
                                   1991




                            /s/ Reverge Anselmo
                            ----------------------------------------------------
                            Name:  REVERGE ANSELMO, as trustee of the Article
                                   VII Trust created by the RENE ANSELMO
                                   REVOCABLE TRUST DATED JUNE 10, 1994 and as a
                                   successor trustee under the Voting Trust
                                   Agreement dated as of February 28, 1995

                                       7


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