Document:

<PAGE>   1

                                 AMENDMENT NO. 1
                          TO MUTUAL SERVICES AGREEMENT

This Amendment No. 1 to Mutual Services Agreement (this "Amendment") is made
as of the 30th day of June, 2000 by and between Charter Communications, Inc.
("CCI") and Charter Investment, Inc. ("CII").

                                    RECITALS

      A.    CCI and CII are parties to that certain Mutual Services Agreement
            dated as of November 12, 2000 (the "Mutual Services Agreement").

      B.    CCI and CII wish to amend the Mutual Services Agreement as more
            fully set forth below.

NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, and for other good and valuable consideration, the receipt and
proficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

      1. Replacement of Section 5. Section 5 of the Mutual Services Agreement is
      hereby deleted in its entirety and in lieu thereof is included a new
      Section 5 as follows:

            "5. LEASE OF EMPLOYEES. CII SHALL LEASE TO CCI AND CCI AGREES TO
LEASE FROM CII THE INDIVIDUALS WHO ARE EMPLOYEES OF RECORD OF CII AND WHOSE
SERVICES ARE REQUIRED FOR THE PERFORMANCE OF THE SERVICES TO BE PROVIDED TO CCI
AS SET FORTH IN PARAGRAPH 2 HEREOF (THE "LEASED EMPLOYEES"). IN CONNECTION WITH
THE LEASED EMPLOYEES, THE PARTIES HERETO HEREBY AGREE AS FOLLOWS:

            (a) EQUITY-BASED COMPENSATION. CCI, THROUGH A COMMITTEE OF ITS BOARD
OF DIRECTORS, SHALL HAVE THE EXCLUSIVE RIGHT TO ISSUE OPTIONS TO THE LEASED
EMPLOYEES UNDER THE CHARTER COMMUNICATIONS OPTION PLAN;

            (b) CONTROL OF CONDITIONS OF EMPLOYMENT. CCI SHALL HAVE THE RIGHT TO
MAKE FUNDAMENTAL EMPLOYMENT DECISIONS REGARDING THE LEASED EMPLOYEES (INCLUDING,
WITHOUT LIMITATION, THE RIGHT TO DIRECT AND CONTROL THE ACTIVITIES, DUTIES AND
RESPONSIBILITIES OF THE LEASED EMPLOYEES, AND THE RIGHT TO HIRE AND TO TERMINATE
LEASED EMPLOYEES);

            (c) COMPENSATION. CCI SHALL HAVE THE EXCLUSIVE RIGHT TO DETERMINE
THE COMPENSATION (INCLUDING, WITHOUT LIMITATION, CASH AND EQUITY-BASED
COMPENSATION) OF THE LEASED EMPLOYEES. NOTWITHSTANDING THE FOREGOING, CII SHALL

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BE OBLIGATED TO PAY THE PROPER AUTHORITIES ALL PAYROLL TAXES ON THE COMPENSATION
PAID TO THE LEASED EMPLOYEES FOR THE SERVICES RENDERED BY THE LEASED EMPLOYEES
TO CCI;

            (d) EMPLOYEE BENEFITS. CCI SHALL OFFER TO THE LEASED EMPLOYEES THE
OPPORTUNITY TO PARTICIPATE IN CCI'S EMPLOYEE BENEFITS PLANS TO THE SAME EXTENT
AND ON SUBSTANTIALLY THE SAME TERMS AS COMPARABLE EMPLOYEES OF CCI; AND

            (e) PAYMENTS. ALL EXPENSES AND COSTS INCURRED WITH RESPECT TO THE
SERVICES PROVIDED HEREUNDER, INCLUDING WITHOUT LIMITATION, WAGES, SALARIES,
PAYROLL TAXES AND OTHER LABOR COSTS, WILL BE PAID BY CCI TO CII MONTHLY IN
ARREARS.

      2. Effectiveness Date; Continuing Effectiveness. This Amendment shall be
      effective as of July 1, 2000. Except as specifically amended hereby, the
      Mutual Services Agreement shall remain in full force and effect.

      3. Governing Law. This Amendment and the rights and obligations of the
      parties hereunder and the persons subject hereto shall be governed by, and
      construed in accordance with the laws of the State of New York, without
      giving effect go to the choice of law principles thereof.

      4. Counterparts. This Amendment may be executed in counterparts each of
      which shall be an original but all of which shall constitute a single
      agreement.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed
as of the day and year first above written.

                                    CHARTER INVESTMENT, INC.
                                    a Delaware corporation

                                    By:   /s/ Marcy Lifton
                                          ----------------------------------
                                          Name:  Marcy Lifton
                                          Title: Vice President

                                    CHARTER COMMUNICATIONS, INC.
                                    a Delaware corporation

                                    By:   /s/ Kent D. Kalkwarf
                                          ----------------------------------
                                          Name:  Kent D. Kalkwarf
                                          Title: Senior Vice President and
                                                 Chief Financial Officer<PAGE>   1
NUMBER                                                               EXHIBIT 4.2
                                                                    COMMON STOCK

                                                                          SHARES

                             [MILLENNIUM CELL LOGO]

                              MILLENNIUM CELL INC.

INCORPORATED UNDER THE LAWS                  SEE REVERSE FOR CERTAIN DEFINITIONS
OF THE STATE OF DELAWARE                     CUSIP 600388 10 5

THIS CERTIFIES THAT

IS THE OWNER OF

FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $.001 EACH OF THE
COMMON STOCK OF

                              MILLENNIUM CELL INC.

                              CERTIFICATE OF STOCK

transferable on the books of the Corporation by the holder hereon in person or
by duly authorized attorney upon surrender of this certificate properly
endorsed.

This certificate is not valid unless countersigned and registered by the
Transfer Agent and Registrar.

WITNESS the facsimile seal of the Corporation and the facsimile signatures of
its duly authorized officers.

Dated:

[Illegible]                     MILLENNIUM CELL, INC.                [Illegible]
SECRETARY                       CORPORATE SEAL 2000                  PRESIDENT
                                DELAWARE

                                                    COUNTERSIGNED AND REGISTERED
                                         AMERICAN STOCK TRANSFER & TRUST COMPANY
                                                                  TRANSFER AGENT
                                                                  AND REGISTRAR,

                                                  BY

                                                              AUTHORIZED OFFICER
<PAGE>   2
     The Corporation will furnish without charge to each stockholder who so
requests a statement of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series
thereof and the qualifications, limitations or restrictions of such preferences
and/or rights.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>
<CAPTION>
     <S>        <C>                                    <C>                  <C>
     TEN COM -- as tenants in common                   UNIF GIFT MIN ACT --           Custodian
     TEN ENT -- as tenants by the entireties                                ---------          ----------
     JT TEN  -- as joint tenants with right of                                 (Cust)          (Minor)
                survivorship and not as tenants                             under Uniform Gifts to Minors
                in common                                                   Act
                                                                                -------------------------
                                                                                       (State)
</TABLE>

    Additional abbreviations may also be used though not in the above list.

     For value received,                                 hereby sell, assign and
                         -------------------------------
transfer unto

     PLEASE INSERT SOCIAL SECURITY OR OTHER
         IDENTIFYING NUMBER OF ASSIGNEE
     --------------------------------------

     --------------------------------------

--------------------------------------------------------------------------------
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

------------------------------------------------------------------------- shares
of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

----------------------------------------------------------------------- Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated
      ------------------------------------

                            ----------------------------------------------------
                            THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
                    NOTICE: WITH THE NAME AS WRITTEN UPON THE FACE OF THE
                            CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION
                            OR ENLARGEMENT OR ANY CHANGE WHATEVER

SIGNATURE(S) GUARANTEED:

-------------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE
GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND
LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN
AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO S.E.C. RULE 17Ad-15.

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    AMERICAN BANK NOTE COMPANY                    PRODUCTION COORDINATOR,
      55TH and SANSOM STREET                     LISA MARTIN: 215-764-8625
      PHILADELPHIA, PA 19139                      PROOF OF JUNE 20, 2000
          (215) 764-8600                            MILLENNIUM CELL INC.
                                                         H 66824 bk
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SALES: R. JOHNS:  212-269-0339  X-13          OPERATOR:                  JW
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/HOME 14/LIVE JOBS/M/Millennium 66824                        NEW
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