Document:

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                                                                 Exhibit 10.54.1

                            FIRST AMENDMENT TO LEASE
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            AGREEMENT, dated as of May 23, 2000 between 225 FOURTH, LLC, a
Delaware limited liability company whose address is c/o Orda Management
Corporation, 225 Park Avenue South, New York, New York 10003 ("LANDLORD"), and
ACTV, INC., a Delaware corporation, whose address is 1270 Sixth Avenue, New
York, New York prior to the commencement of the Term, and thereafter Tenant's
address shall be that of the Building ("TENANT").

                                   WITNESSETH:
                                   -----------

            WHEREAS, pursuant to a Lease, dated as of December 1, 1999, between
Landlord and Tenant (the "LEASE"), Tenant is leasing from Landlord the entire
19th Floor and the 19th Floor Mezzanine (the "ORIGINAL PREMISES" or the
"PREMISES") of the office building known as 225 Park Avenue South, New York, New
York ("BUILDING A") and the entire 10th floor (the "FIRST TEMPORARY SPACE") of
233 Park Avenue South, New York, New York ("BUILDING B"; together with Building
A, the "BUILDING").

            WHEREAS, Landlord and Tenant desire to amend the Lease to provide
that Landlord leases to Tenant and Tenant hires from Landlord the entire 18th
floor of Building A, all on the terms and conditions hereinafter set forth.

            NOW, THEREFORE, Landlord and Tenant agree as follows:

            1. DEFINED TERMS. All capitalized terms used herein but not defined
shall have the meanings ascribed to them in the Lease.

            2. EXPANSION SPACE. Landlord and Tenant hereby acknowledge that
Tenant has exercised Tenant's Expansion Option pursuant to Article 10 of the
Lease and that the Expansion Space shall become part of the Premises, on the
terms and conditions set forth in Article 10 of the Lease, on the ES Inclusion
Date.

            3. LEASE OF NEW SPACE. (a) Landlord hereby leases to Tenant and
Tenant hereby hires from Landlord, upon and subject to the terms, covenants,
provisions and conditions of the Lease and this Agreement, the entire 18th floor
of Building A substantially as shown hatched on the plan attached hereto as
EXHIBIT A (the "NEW SPACE"). The New Space shall be conclusively deemed to
contain 25,902 rentable square feet. Effective as of the date hereof, the terms
"PREMISES" and "ORIGINAL PREMISES" as used in the Lease shall (except as set
forth to the contrary in this SECTION 3) be deemed to include the New Space.

                (b) The lease of the New Space by Tenant shall be on all of
the terms and conditions of the Lease (as amended hereby), except that:

            (i) (A) The term of the lease of the New Space shall commence on the
New Space Possession Date (as defined below) and shall end, unless sooner
terminated as provided in the Lease, on the Expiration Date (as defined in
Section 1.02 of the Lease). "NEW SPACE

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POSSESSION DATE" shall mean the day on which Landlord's New Space Work (as
defined below) is substantially completed in accordance with SECTION 3(b)(i)(C)
below. Landlord shall use reasonable efforts to substantially complete
Landlord's New Space Work on or before February 1, 2001. If Landlord's New Space
Work is substantially completed prior to February 1, 2001, such date of
substantial completion shall be the New Space Possession Date. Landlord shall
advise Tenant of the date Landlord's New Space Work is substantially completed
and Landlord and Tenant shall promptly confirm the New Space Possession Date and
the New Space Rent Commencement Date by a separate instrument to be prepared by
Landlord; PROVIDED, that the failure to execute and deliver such instrument
shall not affect the determination of such dates in accordance with the Lease.
Tenant shall have the right to dispute the determination of the New Space
Possession Date by submitting such dispute to binding arbitration before the
American Arbitration Association in the City of New York, County of New York;
PROVIDED that Tenant has not commenced Tenant's Initial Improvements in the New
Space or otherwise taken exclusive possession of the New Space prior to
Landlord's proposed New Space Possession Date. Pending the resolution of any
dispute as to the New Space Possession Date, Tenant shall pay New Space Rent
based upon Landlord's determination.

                  (B) Landlord shall provide Tenant with written notice upon
Landlord obtaining vacant possession of the New Space from The City University
of New York and the Insurance Trust Fund, the tenants in possession of the space
as of the date of this Agreement. Landlord also shall provide Tenant with 5
business days' written notice of the anticipated date of completion of
Landlord's New Space Work; PROVIDED, that failure to deliver the New Space to
Tenant on the anticipated date of completion of Landlord's New Space Work shall
not impair the validity of this Agreement nor shall it delay the New Space
Possession Date.

                  (C) Landlord's New Space Work shall be deemed to have been
substantially completed on the date upon which Landlord's New Space Work has
been completed, except for (x) minor details or adjustments, (y) items which, in
accordance with good construction practice, should be performed after completion
of Tenant's Initial Improvements with respect to the New Space and (z) any part
of Landlord's New Space Work that is not completed due to Tenant Delay;
PROVIDED, that in each case Landlord shall nevertheless remain obligated to
complete Landlord's New Space Work. If Tenant takes exclusive possession of the
New Space for the performance of Tenant's Initial Improvements with respect to
the New Space or for any other reason, Landlord's New Space Work shall be deemed
to be substantially complete. For purposes of this SECTION 3(b)(i)(C), Tenant
shall be deemed to have taken exclusive possession of the New Space,
notwithstanding the fact that Landlord may be performing the work described in
items (x), (y) and (z) of this SECTION 3(b)(i)(C) in the New Space at such time
as Tenant commences performance of Tenant's Initial Improvements with respect to
the New Space.

                  (D) If for any reason (including, without limitation, any
holdover in the New Space by any prior tenant or occupant thereof) Landlord
shall be unable to deliver possession of the New Space to Tenant on any date
specified in this Agreement for such delivery, Landlord shall have no liability
to Tenant therefor and the validity of this Agreement shall not be impaired, nor
shall the term of this Agreement be extended, by reason thereof. This

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SECTION 3(b)(i)(D) shall be an express provision to the contrary for purposes of
Section 223-a of the New York Real Property Law and any other law of like import
now or hereafter in effect.

                  (E) In no event shall the New Space Possession Date occur
prior to July 1, 2000.

                  (F) Notwithstanding anything to the contrary contained herein,
if Landlord does not deliver the New Space to Tenant on or prior to February 1,
2002 (the "NEW SPACE FIRST TERMINATION DATE"), then Tenant shall have the right
to terminate this Agreement upon thirty (30) days prior written notice (a "NEW
SPACE TERMINATION NOTICE") to Landlord given at any time after the occurrence of
the New Space First Termination Date, and if the New Space Possession Date shall
not have occurred within thirty (30) days after such New Space Termination
Notice is given, then this Agreement shall terminate upon the expiration of such
thirty (30) day period as if such date were the date originally set forth for
the expiration of this Agreement; PROVIDED, HOWEVER, that the Lease shall remain
unmodified and in full force and effect. If Tenant has not delivered a New Space
Termination Notice and the New Space has not been delivered to Tenant on or
prior to May 1, 2002 (the "NEW SPACE SECOND TERMINATION DATE"), either Tenant or
Landlord shall have the right to terminate this Agreement by sending a New Space
Termination Notice to the other party given at any time after the occurrence of
the New Space Second Termination Date, and if the New Space Possession Date
shall not have occurred within thirty (30) days after the date such New Space
Termination Notice is given, then this Agreement shall terminate upon the
expiration of such thirty (30) day period as if such date were the date
originally set forth for the expiration of this Agreement; PROVIDED, HOWEVER,
that the Lease shall remain unmodified and in full force and effect.

            (ii) Fixed Rent in respect of the New Space ("NEW SPACE RENT") shall
be payable from and after the New Space Rent Commencement Date (as hereinafter
defined) as follows:

                 (A) for the period commencing on the New Space Rent
      Commencement Date and ending on the day immediately preceding the 5th
      anniversary of the New Space Rent Commencement Date, One Million One
      Hundred Ninety One Thousand Four Hundred Ninety Two and 00/100
      ($1,191,492.00) Dollars per annum, payable in equal monthly installments
      of Ninety Nine Thousand Two Hundred Ninety One and 00/100 ($99,291.00)
      Dollars (an annual rate of $46.00 per rentable square foot contained in
      the New Space);

                 (B) for the period commencing on the 5th anniversary of the New
      Space Rent Commencement Date and ending on the day immediately preceding
      the 10th anniversary of the New Space Rent Commencement Date, One Million
      Two Hundred Ninety Five Thousand One Hundred and 00/100 ($1,295,100.00)
      Dollars per annum, payable in equal monthly installments of One Hundred
      Seven Thousand Nine Hundred Twenty Five and 00/100 ($107,925.00) Dollars
      (an annual rate of $50.00 per rentable square foot contained in the New
      Space); and

                 (C) for the period commencing on the 10th anniversary of the
      New Space Rent Commencement Date and ending on the Expiration Date, One
      Million Four

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      Hundred Twenty Four Thousand Six Hundred Ten and 00/100 ($1,424,610.00)
      Dollars per annum, payable in equal monthly installments of One Hundred
      Eighteen Thousand Seven Hundred Seventeen and 50/100 ($118,717.50) Dollars
      (an annual rate of $55.00 per rentable square foot in the New Space).

New Space Rent shall be payable by Tenant in equal monthly installments in
advance commencing on the New Space Rent Commencement Date and on the first day
of each calendar month thereafter; PROVIDED, that Tenant shall pay, upon the New
Space Possession Date, the first full monthly installment of New Space Rent and
PROVIDED FURTHER, that if the New Space Rent Commencement Date is not the first
day of a month, then the New Space Rent for the month in which the New Space
Rent Commencement Date occurs shall be prorated and paid on the New Space Rent
Commencement Date. "NEW SPACE RENT COMMENCEMENT DATE" means the date occurring
in the fourth (4th) month after the New Space Possession Date which is the same
numerical date in the month as the New Space Possession Date except that if no
same numerical date shall exist in such fourth (4th) month, the New Space Rent
Commencement Date shall be the last day of such fourth (4th) month.

                        (iii) From and after the New  Space  Possession  Date,
Tenant shall pay Tenant's tax share in respect of the New Space ("NEW SPACE TAX
SHARE") in the manner provided in SECTION 2.04 of the Lease. The New Space Tax
Share shall mean 5.5027%. The parties hereto agree that the rentable square foot
area of the New Space shall be deemed to be 25,902 rentable square feet and, for
the purpose of calculating the New Space Tax Share, the rentable square foot
area of Building A shall be deemed to be 470,717 rentable square feet. The New
Space Tax Share has been determined by dividing the rentable square foot area of
the New Space by the rentable square foot area of Building A.

                        (iv) (A) Upon the execution of this Agreement, Tenant
has delivered to Landlord, as security for the performance of Tenant's
obligations under the Lease and this Agreement, either (i) the sum of
$500,000.00, in certified or official bank check (the "INITIAL NEW SPACE
SECURITY DEPOSIT"), or (ii) an unconditional, irrevocable letter of credit in
the amount of $500,000.00 in a form and issued by a bank reasonably satisfactory
to Landlord (the "INITIAL NEW SPACE LETTER OF CREDIT"). Within ten (10) days
after notice from Landlord to Tenant that the New Space is vacant and Landlord
is in possession of the New Space, Tenant shall deliver to Landlord, as further
security for the performance of Tenant's obligations under the Lease and this
Agreement, either (i) the sum of $2,200,000.00, in certified or official bank
check (the "ADDITIONAL NEW SPACE SECURITY Deposit"; together with the Initial
New Space Security Deposit, the "NEW SPACE SECURITY DEPOSIT") or (ii) an
unconditional, irrevocable letter of credit in the amount of $2,200,000.00 in a
form issued by a bank reasonably satisfactory to Landlord (the "ADDITIONAL NEW
SPACE LETTER OF CREDIT"; together with the Initial New Space Letter of Credit,
the "NEW SPACE LETTER OF CREDIT"). The New Space Letter of Credit and the New
Space Security Deposit shall be subject to the terms and conditions set forth in
Section 2.09(a) of the Lease.

                  (B) In the event that Tenant shall have prior to the
      expiration of the Election Period elected to forego receipt of Landlord's
      New Space Contribution pursuant

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      to SECTION 3(b)(viii) below, the amount of the New Space Security Deposit
      required hereunder shall be reduced by $647,550.00.

                  (C) If, from and after the New Space Possession Date, (A)
      there is not a monetary default beyond any applicable notice and grace
      period under the Lease, as amended by this Agreement and (B) Tenant
      delivers to Landlord evidence that it has a NOI (as defined in the Lease)
      of at least $8,000,000.00 and that the Tenant has maintained a NAV (as
      defined in the Lease) of at least $40,000,000.00 during the preceding
      twenty-four (24) month period, then the New Space Security Deposit shall
      be reduced to $1,191,492.00.

                  (D) If the New Space Security Deposit has been reduced
      pursuant to SECTION 3(b)(iv)(C) above, then if, during the first nine (9)
      years of the Term, there is not a monetary default beyond any applicable
      notice and grace period under the Lease, as amended by this Agreement,
      then upon the tenth (10th) anniversary of the New Space Rent Commencement
      Date, the New Space Security Deposit shall be reduced by $99,291.00; and
      if, during each succeeding year of the Term, there is not a monetary
      default beyond any applicable notice and grace period, then upon each
      succeeding anniversary of the New Space Rent Commencement Date, the New
      Space Security Deposit shall be reduced by an additional $99,291.00.

                  (E) If the Security Deposit is reduced pursuant to SECTION
      3(b)(iv)(D) above, and after the date of any such reduction there is a
      monetary default beyond any applicable notice and grace period, the New
      Space Security Deposit required shall be increased to $1,191,492.00 (the
      amount of the New Space Security Deposit prior to any reduction pursuant
      to SECTION 3(b)(iv)(C) above) and Tenant shall be required to deliver to
      Landlord as further security for the performance of Tenant's obligations
      under this Lease, within ten (10) days notice from Landlord and in
      accordance with the provisions of SECTION 3(b)(iv)(A) above, the
      difference between $1,191,492.00 and the then current amount of the New
      Space Security Deposit.

                  (F) In the event that Tenant is entitled to a reduction in the
      amount of the New Space Security Deposit under SECTIONS 3(b)(iv)(C) or (D)
      above, Landlord shall (1) if the New Space Security Deposit was paid in
      cash, return the amount of such reduction to Tenant by check or (2) if the
      New Space Security Deposit was given in the form of a letter of credit,
      exchange the existing New Space Letter of Credit for a letter of credit in
      the amount of the reduced New Space Security Deposit. If, within thirty
      (30) days after receiving notice from Tenant that Tenant is entitled to a
      reduction in the New Space Security Deposit, unless Landlord is disputing
      the same, Landlord does not return the amount of the reduction to Tenant
      or, if applicable, cooperate with Tenant in obtaining a new letter of
      credit for the reduced amount of the New Space Security Deposit, then
      Tenant shall be entitled to interest, at the Interest Rate, on the amount
      of the reduction of the New Space Security Deposit.

                  (G) If, the New Space Security Deposit has been reduced
      pursuant to SECTION 3(b)(iv)(C) above, and at any time during the Term,
      after such reduction,

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      Tenant's NOI falls below $8,000,000.00 and/or Tenant's NAV falls below
      $40,000,000.00, then the New Space Security Deposit required shall be
      increased to $2,700,000.00 (less any reduction in the New Space Security
      Deposit pursuant to SECTION 3(b)(iv)(B) above, if applicable) and Tenant
      shall be required to deliver to Landlord as further security for the
      performance of Tenant's obligations under the Lease, as amended by this
      Agreement, within ten (10) days notice from Landlord and in accordance
      with the provisions of SECTION 3(b)(iv)(A) above, an amount equal to the
      difference between $2,700,000.00 (less any reduction in the New Space
      Security Deposit pursuant to SECTION 3(b)(iv)(B) above, if applicable) and
      the then current amount of the New Space Security Deposit.

                        (v) From and after the New Space Possession Date,
Landlord shall supply the New Space with electric service as set forth in
SECTION 2.07 of the Lease and Tenant shall pay for electricity supplied to the
New Space at the rate and in the manner provided therein.

                        (vi) From and after the New Space Possession Date,
Tenant shall pay the Wage Increase Charge at the rate and in the manner provided
in SECTION 2.10(B) of the Lease. The Multiplication Factor with respect to the
New Space shall mean the product obtained by multiplying the area of the New
Space (which, for the purposes of this Section, the parties have agreed shall be
25,902 rentable square feet, as the same may be increased or decreased pursuant
to the express provisions of the Lease and this Agreement) by one (1).

                        (vii) Unless Tenant shall have elected to forego the
same pursuant to SECTION 3(b)(viii) below, Landlord agrees to contribute
Twenty-Five ($25) Dollars per rentable square foot of the New Space, for a total
of $647,550.00, toward the cost of the Tenant's Initial Improvements with
respect to the New Space ("LANDLORD'S NEW SPACE CONTRIBUTION"). Landlord shall
pay Landlord's New Space Contribution in the manner set forth in SECTION 4.01(e)
of the Lease; and SECTION 4.01(f) and (g) of the Lease shall apply to the
Landlord's New Space Contribution as well as to the Landlord's Contribution.

                        (viii) During the Election Period (as defined in the
Lease) and provided that Tenant provides Landlord with evidence reasonably
satisfactory to Landlord that Tenant's Initial Improvements with respect to New
Space will cost a minimum of Twenty-Five ($25) Dollars per rentable square foot
of the New Space, Tenant shall have the right to elect not to receive Landlord's
New Space Contribution and, in lieu thereof, shall receive a reduction in New
Space Rent of $3.02 per year per rentable square foot contained in the New Space
(i.e., $78,224.04 per year with respect to the New Space). Tenant shall give
Landlord such notice prior to the expiration of the Election Period. Time shall
be of the essence with respect to the giving of such notice. Tenant may only
elect not to receive Landlord's New Space Contribution pursuant to this
provision if Tenant also shall elect not to receive Landlord's Contribution
pursuant to SECTION 2.02(b) of the Lease.

                        (ix)  Landlord   shall   furnish   Tenant  with  heat,
ventilation and air-conditioning to the New Space during Business Hours on
Business Days; if Tenant shall require heat, ventilation or air-conditioning
services at any other times, Landlord shall furnish such

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wservice at a rate which is the greater of (x) the actual cost to Landlord of
providing the service in question and (y) $150.00 per hour, for a minimum of
four (4) hours; provided that if other tenants in Building A also have requested
that Landlord provide such overtime service, the cost of such overtime service
shall be divided pro rata among all tenants requesting such overtime service.
Air-conditioning shall only be available from May 1st through October 15th.

                        (x) Landlord shall deliver to the New Space 65 nominal
tons of air conditioning per floor with adequate condenser water (up to 65
nominal tons) from Landlord's cooling towers to serve such air conditioning from
May 1st to October 15th on Business Days during Business Hours. Tenant shall
have the right to install supplementary or auxiliary air-cooled HVAC equipment
to serve the New Space, the specifications and installation of which system
shall be subject to Landlord's reasonable approval, which shall include, without
limitation, the consideration of the structural impact and the aesthetic impact
on Building A of such supplementary or auxiliary air-cooled HVAC equipment;
PROVIDED, HOWEVER, that if Landlord has excess condenser water capacity, which
shall be determined by Landlord in Landlord's sole discretion, Landlord shall
permit Tenant to use such excess capacity in lieu of installing supplementary or
auxiliary air-cooled HVAC equipment to serve the New Space. Such excess
condenser water shall be provided to Tenant, at Tenant's expense, in an amount
equal to Landlord's then established rate for the provision of condenser water,
which in no event shall be less than $150.00 per hour, for a minimum of four (4)
hours. From May 1st through October 15th, if Tenant requires condenser water
from Landlord's cooling towers for more extended hours or on Non-Business Days
or on holidays, Landlord will furnish the same, at Tenant's expense, in an
amount equal to $150.00 per hour, for a minimum of four (4) hours; provided that
if other tenants of Building A also have requested that Landlord provide such
overtime service, the cost of such overtime service shall be divided pro rata
among all tenants requesting such overtime service.

                        (xi) Landlord, at Landlord's expense, shall perform or
cause to be performed the initial work described on EXHIBIT B ("LANDLORD'S NEW
SPACE WORK") in accordance with the provisions thereof. On the New Space
Possession Date, Tenant shall accept the New Space in its "as is" condition on
such date; PROVIDED that Landlord's New Space Work shall be substantially
complete in accordance with SECTION 3(b)(i)(C) above. All other improvements
which do not constitute Landlord's Initial Work or Landlord's New Space Work
shall be performed by Tenant at Tenant's expense in accordance with SECTIONS
4.01 and 4.02 of the Lease.

                        (xii) The representations made by the Landlord in
Section 4.06(d) though (h) of the Lease shall apply to the New Space.

                        (xiii) There shall not be more than 1 subtenant of the
New Space and no sublease shall be for less than 5,000 rentable square feet. In
all other respects, any assignment or subletting of the New Space shall be
subject to the terms and conditions of Article 5 of the Lease.

                        (xiv) Landlord agrees that Tenant shall, subject to the
consent of Landlord (which consent shall not be unreasonably withheld,
conditioned or delayed), be permitted to install signage of Tenant's design in
the elevator lobby of the New Space.

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                        (xv) Section 8.18(b) of the Lease is hereby amended by
deleting the number "5" from the last line thereof and inserting the number "10"
in lieu thereof, so that Tenant shall be entitled to a minimum of 10 spaces in
the Building directory.

            4. TEMPORARY SPACE. (a) In Section 1.06(a) of the Lease, the
reference to "Section 1.08" shall be replaced by "Article 10."

               (b) Notwithstanding anything to the contrary contained in Section
1.03(a) or Section 1.06 of the Lease, Landlord and Tenant hereby agree that
Landlord shall have no obligation to provide Tenant with the Second Temporary
Space referenced in Section 1.06(b) of the Lease.

            5. TELECOMMUNICATIONS. (a) Tenant shall have the right to install,
maintain and operate, at Tenant's sole cost and expense, communications
equipment (e.g., a satellite dish or dishes) (the "ROOF EQUIPMENT") in a
location on the roof of the Building A, which location shall be determined in
Landlord's sole discretion, PROVIDED that in exercising its sole discretion,
Landlord shall use commercially reasonable efforts to select a location for the
Roof Equipment which does not materially adversely affect the receipt of and/or
transmittal of microwave or other similar signals to or from the Roof Equipment.
The Roof Equipment shall not exceed a footprint of five (5') feet by five (5')
feet and shall weigh no more than twenty (20) pounds. Tenant shall pay to
Landlord $1,250.00 per annum for the use of such space on the roof, which charge
shall be considered an Additional Charge under the Lease.

               (b) Tenant shall furnish detailed plans and specifications for
the Roof Equipment (or any modification thereof) to Landlord for its approval.
Tenant's use of the rooftop of the Building shall be a non-exclusive use and
Landlord may permit the use of any other portion of the roof to any other person
for any use including installation of other communication equipment. Tenant's
use of the rooftop shall not impair any other person's data transmission and
reception via its respective communication equipment. If Tenant's construction,
installation, maintenance, repair, operation or use of the Roof Equipment shall
interfere with the rights of Landlord (including, without limitation, Landlord's
right to use the remainder of the roof) or of other tenants in the Building,
Tenant shall cooperate with Landlord or such other tenants in eliminating such
interference. Tenant shall secure and keep in full force and effect, from and
after the time Tenant begins construction and installation of the Roof
Equipment, such supplementary insurance with respect to the Roof Equipment as
Landlord may reasonably require. Tenant shall pay any additional or increased
insurance premiums incurred by Landlord with respect to the Roof Equipment.

               (c) In connection with the installation, maintenance and
operation of the Roof Equipment, Tenant, at Tenant's sole cost and expense,
shall comply with all Laws, including, without limitation, any requirement to
install screening surrounding such installations, and shall procure, maintain
and pay for all permits required therefor, and Landlord makes no warranties
whatsoever as to the permissibility of Roof Equipment under applicable Laws or
the suitability of the roof of the Building for the installation thereof. If
Landlord's structural engineer deems it advisable that there be structural
reinforcement of the roof in connection with the installation of the Roof
Equipment Landlord shall perform same at Tenants' cost and expense

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and Tenant shall not perform any such installation prior to the completion of
any such structural reinforcement. The installation of the Roof Equipment shall
be subject to the provisions of SECTION 4.02 of the Lease applicable to
Alterations. For the purpose of installing, servicing or repairing the Roof
Equipment (including, without limitation, running wires from the Original
Premises and/or the New Space to the Roof Equipment), Tenant shall have access
to the rooftop of the Building at reasonable times upon reasonable notice to
Landlord and Landlord shall have the right to require, as a condition to such
access, that Tenant (or its employee, contractor or other representative) at all
times be accompanied by a representative of Landlord. Unless the electricity
consumed by the Roof Equipment is included on Tenant's submeters, Landlord shall
reasonably estimate the electricity consumed by the Roof Equipment and Tenant
shall pay to Landlord on the first day of each month the amount so determined by
Landlord.

               (d) Tenant, at its sole cost and expense, shall promptly repair
any and all damage to the rooftop or to any other part of the Building caused by
the installation, maintenance, repair, operation or removal of the Roof
Equipment. Tenant shall be responsible for all costs and expenses for repairs
and maintenance of the roof which result from Tenant's use of the roof for the
construction, installation, maintenance, repair, operation and use of the Roof
Equipment. All installations made by Tenant on the rooftop or in any other part
of the Building pursuant to the provisions of this PARAGRAPH 5 shall be at the
sole risk of Tenant, and neither Landlord, nor any agent or employee of
Landlord, shall be responsible or liable for any injury or damage to, or arising
out of, the Roof Equipment. Tenant's indemnity under SECTION 6.12 of the Lease
shall apply with respect to the installation, maintenance, operation, repair,
presence or removal of the Roof Equipment.

               (e) Upon the expiration of the Term, the Roof Equipment shall be
removed by Tenant at its sole cost and expense, and Tenant shall repair any
damage to and restore the rooftop or any other portions of the Building to their
condition existing immediately prior to Tenant's installation of the Roof
Equipment.

               (f) Notwithstanding anything to the contrary contained in this
PARAGRAPH 5, Landlord shall have the right, at Landlord's expense, to relocate
the Roof Equipment to another location on the roof of the Building, provided
that Landlord does not, except on a temporary basis, materially adversely affect
the receipt of and/or transmittal of microwaves or other similar signals, and
Tenant shall cooperate in all reasonable respects with Landlord in any such
relocation; PROVIDED, that if such relocation is done pursuant to any Law, the
cost thereof shall be borne by Tenant.

               (g) The rights granted in this PARAGRAPH 5 are given in
connection with, and as part of the rights created under, this Lease and are not
separately transferable or assignable but shall inure to and benefit Tenant and
its permitted successors and assigns. Tenant shall use the Roof Equipment solely
in connection with activities permitted under SECTION 1.05 of the Lease. Tenant
shall not sell any services arising out of the use of the Roof Equipment (i) to
any other tenant or occupant of the Building (other than subtenants of Tenant)
or (ii) to the general public.

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               (h) If the installation of the Roof Equipment or any act or
omission relating thereto should revoke, negate or in any manner impair or limit
any roof warranty or guaranty obtained by Landlord, then Tenant shall reimburse
Landlord for any loss or damage sustained or costs or expenses incurred by
Landlord as a result of such impairment or limitation.

            6. PASSENGER ELEVATORS. (a) Landlord and Tenant agree that Landlord
shall perform such work as is necessary to provide three (3) passenger elevators
to the 19th floor. Landlord and Tenant further agree that Tenant shall pay to
Landlord, the sum of $300,000.00 ("TENANT'S ELEVATOR CONTRIBUTION") which shall
be used by Landlord towards the expenses of providing three (3) passenger
elevators to the 19th floor. Such expenses shall include, but shall not be
limited to, the cost of the elevators, the cost of the structural work and any
fees for the services of architects, engineers or other design professionals
related to the extension of the passenger elevator service. Tenant's Elevator
Contribution shall be payable in six (6) equal monthly installments of
$50,000.00, commencing on June 1, 2000 and on the first day of each calendar
month thereafter through and including December 1, 2000. Landlord and Tenant
hereby agree that the construction work necessary to extend such passenger
elevator service shall be performed pursuant to Landlord's agreements with
Republic Elevator Corp., ACC Construction Corp. and Building System Evaluations
regarding such construction work.

            (b) If Landlord shall not have delivered the Original Premises to
Tenant and Tenant or Landlord shall elect to terminate the Lease in accordance
with Section 1.06(e) of the Lease, then Landlord shall pay to Tenant the amount
of Tenant's Elevator Contribution plus interest at the rate of nine (9%) percent
calculated from September 1, 2000 through the Termination Date set forth in the
Termination Notice.

            7. REPAIRS. SECTION 4.05 of the Lease shall be amended to include
the following provisions: "(b) Landlord shall maintain, operate and repair the
Building in a standard comparable to that of first class multi-tenanted
non-institutional office buildings in the Union Square area of Manhattan."

            8. INTERIOR STAIRWAY. Tenant shall have the right to install an
interior stairway between the New Space and the 19th Floor of the Original
Premises, subject to Landlord's consent which shall not be unreasonably withheld
or delayed. The installation of such an interior stairway shall be subject to
the requirements of Article 4 of the Lease; PROVIDED, however, that if Tenant
has constructed an interior stairway in the Premises, then at least six (6)
months prior to the expiration of the Term, Tenant shall by written notice to
Landlord request that Landlord advise Tenant, in writing, no later than three
(3) months prior to the expiration of the Term, of whether Landlord will require
that Tenant demolish and remove the interior stairway and close and restore all
interior stair openings. In the event that Landlord does not so advise Tenant,
as aforesaid, Landlord shall be deemed to have required the demolition, removal
and restoration of the stair opening. In connection with such work, Tenant shall
at its sole cost and expense repair and close the internal slab-cuts between the
floors of the Premises, and the replaced slabs shall have a load-bearing
capacity not less than the capacity for such space permitted by the certificate
of occupancy for Building A, as appropriate. The structural supports shall be
fireproofed and shall provide the same above ceiling clearances as are available
on the balance of the appropriate

                                      -10-
<PAGE>

floor. If columns need to be installed, such columns shall be lined up with
existing columns on contiguous floors of Building A, as appropriate.

            9. CERTIFICATIONS, REPRESENTATIONS AND WARRANTIES. (a) Tenant hereby
certifies to Landlord that, as of the date hereof, (i) the Lease is in full
force and effect and has not been modified, changed, altered or amended in any
respect except pursuant to this First Amendment, (ii) to the best of Tenant's
knowledge, there are no defaults existing under the Lease on the part of either
Landlord or Tenant, (iii) to the best of Tenant's knowledge, there exist no
valid defenses, offsets, credits, deductions in rent or claims against the
enforcement of any of the agreements, terms, covenants, or conditions of the
Lease, and (iv) there are no actions, whether voluntary or otherwise, pending
against Tenant under the bankruptcy laws of the United States or any state
thereof.

            (b) Tenant represents and warrants, on behalf of itself and its
successors and assigns, that it has not assigned, pledged, mortgaged or
encumbered the Lease or sublet the Premises, or any portion thereof, or done or
suffered any other action as a result of which the Lease or the Premises, or any
portion thereof, might be subject to any lien, encumbrance or right of
occupancy.

            (c) Landlord hereby certifies to Tenant that, as of the date hereof,
(i) the Lease is in full force and effect and has not been modified, changed,
altered or amended in any respect except pursuant to this First Amendment, (ii)
to the best of Landlord's knowledge, there are no defaults existing under the
Lease on the part of either Landlord or Tenant and (iii) to the best of
Landlord's knowledge, there exist no valid defenses, offsets, credits,
deductions in rent or claims against the enforcement of any agreements, terms,
covenants or conditions of the Lease.

            10. BROKERS. Each party represents to the other that such party has
dealt with no broker other than Insignia/ESG, Inc. (the "BROKER") in connection
with this Agreement or the Building, and each party shall indemnify and hold the
other harmless from and against all loss, cost, liability and expense (including
reasonable attorneys' fees) arising out of any claim for a commission or other
compensation by any broker other than the Broker who alleges that it has dealt
with the indemnifying party in connection with this Agreement or the Building.
Landlord shall be responsible for the commission, if any, due Broker pursuant to
a separate agreement with Broker.

            11. NO OTHER CHANGES. Except as expressly set forth in this
Agreement, the Lease shall remain unmodified and in full force and effect, and
the Lease as modified herein is ratified and confirmed. All references in the
Lease to "this Lease" shall hereafter be deemed to refer to the Lease as amended
by this Agreement.

                                      -11-
<PAGE>

            IN WITNESS WHEREOF, Landlord and Tenant have duly executed this
First Amendment of Lease as of the day and year first above written.

            LANDLORD:               225 FOURTH, LLC

                                    By: Orda Management Corporation

                                       By: s/ Morton F. Silver
                                          -------------------------------
                                          Morton F. Silver

            TENANT:                 ACTV, INC.

                                    By:   s/ Christopher Cline
                                          -------------------------------
                                          Christopher Cline
                                          EVP

                                      -12-
<PAGE>

                                    EXHIBIT A
                                    ---------

                             FLOOR PLAN OF NEW SPACE

                                      -1-
<PAGE>

                                    EXHIBIT B
                                    ---------

                            LANDLORD'S NEW SPACE WORK

The following work shall constitute "LANDLORD NEW SPACE WORK":

1.    Demolish the premises, subject to Tenant's demolition plan (to be provided
      to Landlord).

2.    Patch and paint, in the paint color to be chosen by Tenant from among the
      Building standard paint colors, any and all columns affected by demolition
      of the premises.

3.    Install new windows.

4.    Deliver connections to the base building electrical, mechanical, plumbing
      and Class E sprinkler systems in good working order.

5.    Ensure that the elevator call button in the lobby of the New Space
      complies with the ADA.

6.    Provide to Tenant an ACP-5 for the New Space.

7.    Provide space in the existing fire-rated chase located in Stairway "C" at
      the southeast corner of Building A, which space shall be suitable for
      installation of Tenant's data, fiber and communication risers, from the
      basement to the 19th floor. Tenant shall be permitted to run its risers
      from the telephone closet in the basement to said chase. Such space in
      said chase shall be, at least, approximately 12" by 12", stacked
      vertically through Building A, and Landlord shall permit Tenant to install
      conduit within said chase. Reasonable access to said chase shall be
      provided on each intermediate floor for the purpose of cable installation
      and maintenance.

                                      -2-<PAGE>
                                                                   Exhibit 10.57

                       ACTV EXECUTIVE EMPLOYMENT AGREEMENT

         THIS AGREEMENT made as of October 1, 2000 by and between ACTV, INC., a
Delaware corporation having an office at 1270 Avenue of the Americas, New York,
New York 10020 ("ACTV"), and KEVIN M. LIGA ("Employee"),

                              W I T N E S S E T H :

         WHEREAS, ACTV desires to employ Employee, and Employee desires to
accept employment, as an Executive Vice President of ACTV;

         NOW, THEREFORE, in consideration of the premises and the mutual
agree-ments herein set forth, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties agree as
follows:

         1. EMPLOYMENT OF EMPLOYEE. ACTV hereby employs Employee as an Exec-
utive Vice President of ACTV. During the term hereof, Employee shall devote all
of his business time and efforts to ACTV and its affiliates, and shall perform
such services and duties and have such powers as may from time to time be
prescribed by the Chief Executive Officer of ACTV ("ACTV'S CEO") or his
designee.

         2. COMPENSATION AND BENEFITS.

                  a. SALARY. ACTV shall pay Employee a salary at the rate of Two
Hundred Twenty Five Thousand dollars ($225,000.00) per year, less
applicable withholding taxes and other payroll deductions required by law,
payable in accordance with ACTV's customary payroll practices.

                  b. ACCELERATION OF VESTING SCHEDULE. Upon any Acceleration
Event (as such term is defined below), all then unvested, unexpired stock
options granted by ACTV to Employee, whether prior to, on or after the date
hereof and whether under any stock incentive plan or otherwise, shall become and
be immediately exercisable, at the respective option price(s) thereof, at any
date prior to the respective expiration date(s) thereof.

         For purposes hereof, an "ACCELERATION EVENT" shall be deemed to occur
upon the date that any of the following shall first occur:

                                      -1-
<PAGE>

         (i) a majority of the Board-nominated slate of candidates for election
to ACTV's Board of Directors shall not be elected thereto;

         (ii) there shall occur a Change of Control (as such term is defined
below) which, prior to the effective date thereof, shall not have been
unanimously approved by all of the members of the Board of Directors of ACTV; or

         (iii) there shall occur a Change of Control which, prior to the
effective date thereof, shall have been unanimously approved by all of the
members of the Board of Directors of ACTV and, upon or within two years after
the effective date of such unanimously-approved Change of Con-trol, there shall
also occur a Separation Event (as such term is defined below) (the effective
date of such Separation Event to be deemed, for purposes of this clause (iii),
the date of the respective Acceleration Event).

         For purposes hereof, a "CHANGE OF CONTROL" shall be deemed to occur
upon the date that any of the following shall first occur:

         (i) a person (other than a person who is an officer or a director of
ACTV on the effective date hereof), including a "group" as defined in Section
13(d)(3) of the Securities Exchange Act of 1934, becomes, or obtains the right
to become, the beneficial owner of ACTV securities having more than 50% of the
combined voting power of such of the then outstanding securities of ACTV as may
be cast for the election of directors of ACTV;

         (ii) a merger of ACTV is consummated in which ACTV is not the surviving
entity;

         (iii) substantially all of the assets of ACTV are sold; or

         (iv) ACTV's stockholders approve the dissolution or liquidation of
ACTV.

         For purposes hereof, a "SEPARATION EVENT" shall be deemed to occur upon
the date that (i) ACTV (or the surviving entity) terminates Employee's
employment without cause (as such term is defined in Section 3(a)(ii) below) or
(ii) Employee terminates his employment hereunder for Good Reason (as such term
in defined in Section 3(a)(i) hereof).

                  c. BONUSES. Employee shall be eligible for such bonuses, if
any, as may hereafter be determined and paid in accordance with such policies as
the Compensation Com-mittee of the Board of Directors of ACTV may set from time
to time.

                  d. BENEFITS. Employee shall be entitled to participate in all
employee health and other benefit plans or programs of ACTV to the extent that
his position, title, tenure, salary and other qualifications make him eligible
to participate. ACTV does not guarantee the continuance of any particular
employee benefit plan or program during the period of Employee's employment, and
Employee's participation in any such plan or program shall be subject to all
terms, provisions, rules and regulations applicable thereto.

                                      -2-
<PAGE>

         3. EMPLOYMENT AT-WILL/TERMINATION.

                  a. TERM; TERMINATION. Employee's employment hereunder shall be
at-will, without fixed term or duration, and this Agreement and Employee's
employment here-under may be terminated at any time as follows:

                           i. BY EMPLOYEE. Employee may terminate this
Agreement, and Employee's employment hereunder, at will, upon written notice to
ACTV, whereupon this Agreement and Employee's employment hereunder (and all of
ACTV's and Employee's respective rights, duties and obligations hereunder) shall
terminate, subject in all respects to Section 3(a)(iv) hereof.

                  In the event that Employee shall terminate his employment for
Good Reas-on (as such term is hereafter defined), Employee shall be entitled to
severance pay equal to six months' of Employee's base salary, in addition to
such rights as Employee may have under any other provisions of this Agreement
(including Section 2(b)(iii) above) upon any termination of his employment for
Good Reason.

                  "GOOD REASON" shall mean any termination of this Agreement
effected by Employee on account of (i) a material breach hereof by ACTV
(including, without limitation, a reduction in base salary from the amount set
forth in Section 2(a) hereof), which breach ACTV shall have failed to cure
within 15 days after its receipt of written notice thereof from Employee, which
notice shall have made specific reference to this Section of this Agreement,
(ii) ACTV's relocation of Employee's office to a location outside of the City of
New York, NY, which relo-cation ACTV shall have failed to rescind within 15 days
after its receipt of a written rescission request from Employee, which request
shall have made specific reference to this Section of this Agreement, or (iii)
the assignment to or taking from Employee, upon or after any Change of Con-trol,
of any duties, responsibilities, status, title or position that is or are, in
the case of any such assignment to Employee materially inconsistent with, or in
the case of any such taking from Em-ployee materially detractive from,
Employee's duties, responsibilities, status, title and position, viewed in the
aggregate, as in effect immediately prior to such Change of Control, which
assign-ment or taking ACTV shall have failed to rescind within 15 days after its
receipt of a written rescission request from Employee, which request shall have
made specific reference to this Section of this Agreement.

                           ii. BY ACTV FOR CAUSE. ACTV may terminate this
Agreement, and Employee's employment hereunder, upon written notice for cause.
For purposes hereof, "CAUSE" shall mean Employee's (1) refusing to carry out the
business of ACTV and its affiliates, as lawfully directed by ACTV, (2) breach of
this Agreement or the CIWP Agreement (as such term is defined in Section 6
hereof) in any material respect, (3) engaging in conduct that consti-tutes
competitive activity in violation of Section 7 hereof, (4) conviction of a
felony, (5) con-tinuing or repeated abuse of alcohol or prescription drugs, (6)
abuse of any controlled substance, or (7) inability to perform and fulfill his
assigned duties due to a disability. Notwithstanding any-thing to the contrary
in this Section 3(a)(ii), ACTV may not terminate Employee's employment for cause
under clause (1) hereof unless Employee shall have first received 15 days

                                      -3-
<PAGE>

written notice from ACTV's CEO advising Employee of the specific acts or
omissions alleged to constitute cause, and such acts or omissions continue
thereafter. Any termination of Employee's employent for disability shall not
affect Employee's right to receive any benefits to which he may be entitled
pursuant to any of the employee benefit plans or programs referenced in Section
2(e).

                           iii. BY ACTV WITHOUT CAUSE. ACTV may terminate this
Agree-ment and Employee's employment hereunder without cause at any time, upon
written notice to Employee. In the event that Employee is terminated without
cause, Employee shall be entitled to severance pay equal to six months' salary,
in addition to such rights as Employee may have under any other provisions of
this Agreement (including Section 2(b)(iii) above) upon any termination of his
employment without cause.

                           iv. SURVIVAL. Notwithstanding any termination of
Employee's em-ployment (whether effected by ACTV, any surviving entity or
Employee under this Section 3 or under any other provision of this Agreement),
the provisions of Sections 6 (Confidential Inform-ation and Work Product
Agreement) and 7 (Covenant Not to Compete) hereof, and Employee's covenants,
duties and obligations thereunder, shall survive such termination and shall
continue in full force and effect in accordance with the respective terms
thereof; provided, that if Employee's employment is terminated by Employee for
Good Reason, the provisions of Section 7 (Covenant Not to Compete) shall not
survive or have any force or effect after the date of such termination.

                  b. TERMINATION UPON DEATH. This Agreement and Employee's
employment hereunder shall automatically terminate upon the death of Employee,
except that Employee's estate shall be entitled to receive any amount accrued
under Section 2(a) for the period prior to Employee's death and any other amount
which Employee was entitled to be paid by ACTV at the time of his death, and
Employee's estate shall be entitled to receive any benefits provided pursuant to
any of the employee benefit plans or programs referenced in Section 2(d).

         4. EXPENSES. Employee shall be reimbursed for all reasonable and
necessary out-of-pocket expenses incurred in the performance of Employee's
duties hereunder, provided that Employee shall have timely submitted to ACTV
reasonably detailed expense reports and receipts with respect thereto on a
timely basis. All air travel shall be in accordance with ACTV's established
travel policies as in effect from time to time.

         5. VACATION. Employee shall be entitled to three weeks of paid vacation
time per year, on dates to be agreed upon between ACTV and Employee. In the
event that Employ-ee's employment is terminated for any reason other than for
cause, Employee's accrued vacation time shall be paid to him at his then current
base salary.

         6. CONFIDENTIAL INFORMATION AND WORK PRODUCT AGREEMENT. Employee has
executed (or is executing, simultaneously herewith) a Confidential Information
and Work Product Agreement dated the date hereof (the "CIWP AGREEMENT"). Neither
this Agreement nor any employment relationship between Employee and ACTV shall
be effective until Employee has executed and delivered the CIWP Agreement.
Employee's obligations under the CIWP Agree-ment shall survive termination of
this Agreement for any reason.

                                      -4-
<PAGE>

         7. COVENANT NOT TO COMPETE. Employee acknowledges and confirms that
ACTV is placing its confidence and trust in Employee. Accordingly, and in
consideration of ACTV's execution of this Agreement, Employee covenants and
agrees that he will not, during the term of his employment, and for a period of
one (1) year thereafter, either directly or indirectly, engage in any business,
either directly or indirectly (whether as a creditor, guarantor, financial
backer, stockholder, director, officer, consultant, advisor, employee, member,
inventor, producer, or otherwise), with or for any company, enterprise,
institution, organization or other legal entity (whether a sole proprietorship,
a corporation, a partnership, a limited liability company, an asso-ciation, or
otherwise, and whether or not for profit), which is in competition with the ACTV
Business (as defined herein). As used in this Agreement, the term "ACTV
BUSINESS" shall mean the invention, development, application, implementation,
extension, operation, licensing and/or management by ACTV and/or any ACTV
affiliate of any invention, software, technology, business, service or product
of ACTV and/or any ACTV affiliate.

                  Furthermore, Employee will not during the term of his
employment, and for a period of one (1) year thereafter, individually or through
any entity, directly or indirectly, without the express prior written consent of
ACTV, become an employee, consultant, advisor, director, officer, producer,
partner or joint or co-venturer of or to, or enter into any contract, agreement
or arrangement with, any entity or business venture of any kind to or of which
ACTV and/or any ACTV affiliate is a licensor or licensee or with which ACTV
and/or any ACTV affili-ate is a joint or co-venturer, partner or otherwise
engaged in any material (or then potentially material) on-going business
relationship or discussions or negotiations with a view to entering into such a
relationship to provide services or products, without the prior written consent
of ACTV, which consent ACTV shall not unreasonably withhold. Nor shall Employee,
during the term of his employment, and for a period of two (2) years thereafter,
individually or through any entity, directly or indirectly, without the express
prior written consent of ACTV, make or otherwise extend any offer of full-time
or part-time employment to any officer or employee of ACTV and/or of any ACTV
affiliate, or otherwise solicit any officer or employee of ACTV and/or of any
ACTV affiliate to seek or accept any full-time or part-time employment, by or
with any person or entity other than ACTV or any ACTV affiliate.

                  Employee hereby acknowledges and agrees that the ACTV Business
ex-tends throughout the United States, and that -- given the nature of the ACTV
Business -- ACTV and/or any ACTV affiliate can be harmed by competitive conduct
anywhere in the United States. Employee therefore agrees that the covenants not
to compete contained in this Section 8 shall be applicable in and throughout the
United States, as well as throughout such non-U.S. areas in which ACTV and/or
any ACTV affiliate may be (or has, with Employee's knowledge and assist-ance,
prepared written plans to be) doing business as of the date of termination of
Employee's employment. Employee further warrants and represents that, because of
his varied skill and abilities, he does not need to compete with the ACTV
Business, and that this Agreement will therefore not prevent him from earning a
livelihood. Employee acknowledges that the restrictions contained in this
Section 8 constitute reasonable protections for ACTV and its affiliates in light
of the foregoing and in light of the promises to Employee contained herein.
Employee and ACTV hereby agree that, if the period of time or the scope of the
restrictive

                                      -5-
<PAGE>

covenant not to compete contained in this Section 8 shall be adjudged
unreasonable by any proper arbiter of a dispute here-under, then the period of
time and/or scope shall be reduced accordingly, so that this covenant may be
enforced in such scope and during such period of time as is judged by such
arbiter to be reasonable.

                  Notwithstanding anything hereinabove set forth in this Section
8, Employee may - solely in his capacity as a passive investor - make equity
investments in any publicly listed company, provided that the amount of any such
investment does not exceed 2% of the issued and outstanding shares of the
capital stock of the respective class of equity securities of such company and
provided, further, that such investment does not violate any then current
investments policy published by ACTV.

                  Notwithstanding anything hereinabove set forth in this Section
8, the provi-sions of this Section 8 shall not survive or otherwise apply to
Employee from and after any date upon which Employee may terminate his
employment hereunder for Good Reason.

                  As used in this Agreement, the term "AFFILIATE" shall mean any
person, corp-oration, partnership, joint venture, limited liability company or
other legal entity that is controlled by ACTV. For purposes of the foregoing
definition, the term "CONTROL" shall mean the capability (whether by ownership
of, or the right to vote, such equity stock or other ownership interests as
shall enable the party owning or voting same, or by the right to elect or
appoint a majority of those directors or other such persons having the
authority) to direct the policies and management of such legal entity.
Accordingly, at the date hereof, such of ACTV's affiliates as are operating
companies are ACTV Entertainment, Inc., Bottle Rocket, Inc., Digital ADCO, Inc.,
HyperTV Networks, Inc. and Media Online Services, Inc.

         8. ENTIRE AGREEMENT. This Agreement, together with the CIWP Agreement
as executed by Employee, contains (with the exception of any stock options that
ACTV may have heretofore granted to Employee) the entire agreement between the
parties at the date hereof with respect to the employment and compensation of
Employee by or on behalf of ACTV or any affili-ate of ACTV and supersedes in all
respects any prior agreement or understanding between Em-ployee and ACTV or any
affiliate of ACTV with respect to the employment and compensation of Employee by
or on behalf of ACTV or any affiliate of ACTV. The unenforceability of any
provi-sion of this Agreement shall not affect the enforceability of any other
provision. This Agreement may not be amended or modified in any way except by an
agreement in writing signed by ACTV, as one party, and by Employee, as the other
party. Any delay in exercising, or any failure to exer-cise, any rights provided
by this Agreement shall not be deemed a waiver thereof, and any express written
waiver thereof shall not be deemed a waiver of any further or future rights.

         9. ASSIGNMENT. Neither party shall have the right to assign any of his
or its respective rights, duties or obligations hereunder to any third party
without the prior written con-sent of the other party hereto, provided that
Employee's consent thereto shall not be required for or in connection with
ACTV's assignment of this Agreement to any entity that shall succeed

                                      -6-
<PAGE>

ACTV as a consequence of any sale of all or substantially all of ACTV's assets,
merger, con-solidation or Change of Control.

         10. NOTICES. All notices, responses, demands or other communications
under this Agreement shall be in writing and shall be deemed to have been given
when:

                  a. delivered by hand, with receipt confirmed;

                  b. transmitted by facsimile, with receipt confirmed, provided
that a copy is mailed on that same transmittal date by certified or registered
mail, return receipt requested; or

                  c. delivered by express delivery service, with receipt
confirmed;

in each case to the appropriate addresses or telecopier numbers set forth below,
or to such address or facsimile number as the respective party may hereafter
otherwise designate in writing:

                           (i) if to ACTV, to:

                                ACTV, Inc.
                                1270 Avenue of the Americas, Suite 2401
                                New York, NY  10020
                                Attn:   William C. Samuels,
                                           Chairman and CEO
                                Facsimile:  (212) 459-9548

                           with a separate and complete copy, under separate
                           cover, to:

                                ACTV, Inc..
                                1270 Avenue of the Americas
                                New York, NY  10020
                                Attn:  Day L. Patterson,
                                           Law Department
                                Facsimile:  (212) 459-9548

                           and

                           (ii) if to Employee, to:

                                Mr. Kevin M. Liga
                                221 Country Ridge Drive
                                Rye Brook, NY  10573

         11. SPECIFIC PERFORMANCE AND INJUNCTIVE RELIEF. Employee hereby
recog-nizes and acknowledges that irreparable injury or damage may result to
ACTV and its affiliates

                                      -7-
<PAGE>

in the event of a breach or threatened breach by Employee of certain of the
terms or provisions of this Agreement including, without limitation, Employee's
covenants in Section 8 hereof, and that ACTV and its affiliates may have no
adequate remedy at law for such breach or threatened breach. Accordingly,
Employee hereby agrees that, in addition to any other available remedies in
equity or at law, ACTV and its affiliates shall be entitled to an injunction
restraining Employee from engaging in any activity constituting such breach or
threatened breach and requiring specific performance of the terms hereof.
Nothing contained herein shall be construed as prohibiting ACTV or any ACTV
affiliate from pursuing any other remedies available to ACTV or any ACTV
affiliate at law or in equity for such breach or threatened breach, including
but not limited to, the recovery of damages from Employee and the termination of
his employment with ACTV in accordance with the terms and provisions of this
Agreement.

         12. ARBITRATION. All controversies which may arise between the parties
hereto shall be determined by binding arbitration applying the laws of the State
of New York. Any arbi-tration pursuant to this Agreement shall be conducted in
New York, New York before the Ameri-can Arbitration Association ("AAA") in
accordance with its arbitration rules. Any dispute to be submitted to
arbitration must be reduced to writing and shall be provided to the other party
and to the AAA in order to initiate the proceedings. The award of the
arbitrator(s), or a majority of them, shall be final, and judgment upon the
award may be confirmed and entered in any state or federal court having
jurisdiction; provided, that the arbitrators shall not have the right to award
any punitive damages (and each of the parties hereto waives any right to claim
or receive any punitive damages, whether in any arbitration proceeding or
otherwise). Nothing in this Section 13 will prevent ACTV or any ACTV affiliate
from resorting to judicial proceedings if interim injunc-tive relief under the
laws of the State of New York from a court is necessary to prevent serious and
irreparable injury or harm to ACTV or any ACTV affiliate.

         13. GOVERNING LAW. This Agreement and any amendments hereto, and
wai-vers and consents with respect thereto, shall be governed by the internal
laws of the State of New York, without regard to the conflict of laws principles
thereof.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first above written.

                                   ACTV, INC.

                                   By:
                                         --------------------------------------
                                         Day L. Patterson,
                                         Exec. Vice President
                                         and General Counsel

                                   ------------------------------------------
                                   KEVIN M. LIGA
                                   (Employee)

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