SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 11-K

                                  ANNUAL REPORT

                        Pursuant to Section 15(d) of the
                         Securities Exchange Act of 1934


                               COMCAST CORPORATION


(Mark One):

         X        ANNUAL  REPORT  PURSUANT  TO SECTION  15(d) OF THE  SECURITIES
        ___       EXCHANGE ACT OF 1934.  For the fiscal year ended  December 31,
                  2003.

                                       OR

        ___       TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                  SECURITIES EXCHANGE ACT OF 1934.
                  For the transition period from _________ to ________

Commission file number 000-50093

                  A. Full  title of the plan and the  address  of the  plan,  if
         different from that of the issuer named below:

                          COMCAST-SPECTACOR 401(K) PLAN

                  B. Name of issuer of the securities  held pursuant to the plan
         and the address of its principal executive office:

                  Comcast Corporation
                  1500 Market Street
                  Philadelphia, PA 19102-2148





Financial Statements and Report of Independent Registered Public
Accounting Firm
Comcast-Spectacor 401(k) Plan
December 31, 2003 and 2002








                          COMCAST-SPECTACOR 401(k) PLAN

                            TABLE OF C O N T E N T S



                                                                                                                    Page
                                                                                                                    ----

                                                                                                                   
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM                                                               3


FINANCIAL STATEMENTS:

         Statement of Net Assets Available for Benefits as of December 31, 2003 and 2002                              4

         Statement of Changes in Net Assets Available for Benefits for the Year Ended December 31, 2003               5

         Notes to Financial Statements                                                                             6-10


SUPPLEMENTAL SCHEDULE:

         Schedule of Assets Held for Investment Purposes as of December 31, 2003                                     11


CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM                                                             12


SIGNATURES                                                                                                           13













             Report of Independent Registered Public Accounting Firm
             -------------------------------------------------------


Plan Administrator
Comcast-Spectacor 401(k) Plan


         We have audited the accompanying  statement of net assets available for
benefits of the Comcast-Spectacor  401(k) Plan as of December 31, 2003 and 2002,
the related  statement of changes in net assets  available  for benefits for the
year ended  December 31, 2003 and the  supplemental  schedule of assets held for
investment purposes as of December 31, 2003. These financial  statements are the
responsibility of the Plan's management.

         We conducted  our audit of the  financial  statements as of and for the
year ended December 31, 2003, in accordance with standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audit  provides  a
reasonable basis for our opinion.

         In our opinion,  the  financial  statements  referred to above  present
fairly, in all material  respects,  the net assets available for benefits of the
Plan as of December 31, 2003 and 2002,  and the changes in net assets  available
for benefits for the year ended December 31, 2003, in conformity with accounting
principles generally accepted in the United States of America.




/s/ Grant Thornton LLP
Philadelphia, Pennsylvania
June 11, 2004



                                       3





                          Comcast-Spectacor 401(k) Plan

                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS

                                  December 31,




                                              2003                2002
                                          -----------         -----------
ASSETS

Investments at fair value                 $16,037,803         $10,818,891
Participant loans                             284,370             274,713
Contribution receivable                          --               212,865
                                          -----------         -----------

NET ASSETS AVAILABLE FOR BENEFITS         $16,322,173         $11,306,469
                                          ===========         ===========







The accompanying notes are an integral part of these statements.

                                       4




                          Comcast-Spectacor 401(k) Plan

            STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

                             Year ended December 31,




                                                          2003
                                                      -----------

Additions to net assets attributed to:
 Investment income
  Net appreciation in fair value of investments       $ 2,225,695
  Dividends and interest                                  230,171
                                                      -----------

                                                        2,455,866

 Contributions
  Participants                                          2,048,655
  Employer                                              1,264,723
  Rollover                                                 65,966
                                                      -----------
                                                        3,379,344

   Total additions                                      5,835,210
                                                      -----------


Deductions from net assets attributed to:
 Benefits paid to participants                            810,376
 Administrative expenses                                    9,130
                                                      -----------

   Total deductions                                       819,506
                                                      -----------

   NET INCREASE                                         5,015,704

Net assets available for benefits
 Beginning of year                                     11,306,469
                                                      -----------

 End of year                                          $16,322,173
                                                      ===========



The accompanying notes are an integral part of these statements.



                                       5






                          Comcast-Spectacor 401(k) Plan

                          NOTES TO FINANCIAL STATEMENTS

                           December 31, 2003 and 2002




NOTE A - DESCRIPTION OF THE PLAN

    The following  description of the  Comcast-Spectacor  401(k) Plan (the Plan)
    provides only general information. Participants should refer to the official
    Plan document for a complete description of the Plan's provisions.

    1.  General
        -------

    The  effective  date of the Plan is January  1, 1992.  The Plan is a defined
    contribution  plan  and  is  subject  to  the  provisions  of  the  Employee
    Retirement   Income  Security  Act  of  1974.  The  Plan  covers   "eligible
    employees,"  as  defined  in the  Plan,  who  have  completed  one  year  of
    eligibility  service  (as  defined  in the Plan) and have  attained  age 21.
    Effective  January 1, 1994,  a 401(k)  feature was added to the Plan and the
    name  was  changed  from  the  Spectacor  Retirement  Plan to the  Spectacor
    Retirement and Savings Plan. Effective January 1, 1997, the name was changed
    to the Comcast-Spectacor  401(k) Plan. The following entities participate in
    the Plan, referred to collectively as "the Company":

   o      Comcast-Spectacor Limited Partnership (Plan Sponsor)
   o      Comcast-Spectacor Limited Partnership Baysox Club, LLC
   o      Comcast-Spectacor Limited Partnership Keys Club, LLC
   o      Comcast-Spectacor Limited Partnership Shorebirds Club, LLC
   o      Spectrum Arena Limited Partnership
   o      Philadelphia Flyers Limited Partnership
   o      Philadelphia 76ers Limited Partnership
   o      Philadelphia Phantoms Limited Partnership
   o      Comcast Spectacor Foundation
   o      Flyers Skate Zone Limited Partnership
   o      Global Spectrum Limited Partnership
   o      Spectacor, Inc.
   o      Patron Solutions Limited Liability Partnership
   o      FPS Rinks Limited Partnership


    Effective  January 1, 2003, the Trustee and  Record-keeper  for the Plan was
    changed by the Plan Sponsor to Smith Barney Corporate Trust Company and Citi
    Street Associates, LLC, respectively.

    2.  Contributions and Related Party Transactions
        --------------------------------------------

    Each participant may make a pretax  contribution  deferring not less than 1%
    or  more  than  100%  of  eligible  compensation  (as  defined  in the  Plan
    agreement),  subject to Internal  Revenue  Service  (IRS)  regulations.  The
    Company  contributed  to the Plan an amount equal to 100% of the first 3% of
    eligible compensation contributed by the participants and 50% of the next 4%
    of eligible compensation contributed by the participants.  Additionally, the
    Plan  provides  for  discretionary  matching  contributions  of  up to 5% of
    eligible compensation  contributed by a participant.  The Plan also provides
    for discretionary profit sharing contributions.




                                   (Continued)


                                       6



                          Comcast-Spectacor 401(k) Plan

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 2003 and 2002




NOTE A - DESCRIPTION OF THE PLAN - Continued

    3.  Participant Accounts
        --------------------

    Each  participant's  account is  credited  with the  participant's  elective
    deferral contribution,  an allocation of the Company's contribution, if any,
    and  Plan  earnings,  net  of  expenses.  Allocations  of  Company  matching
    contributions  are  based on  participant  elective  deferrals  to the Plan.
    Allocations  of profit  sharing  contributions  are in  proportion  to total
    compensation.  The benefit to which a participant is entitled is the benefit
    that can be provided from the participant's account.

    4.  Vesting
        -------

    Participants are immediately vested in their elective deferral contributions
    plus actual earnings thereon.  Vesting in the remainder of their accounts is
    based on years of service.  A participant is 100% vested after five years of
    credited service.  Vesting can be accelerated under certain other conditions
    defined in the Plan.  All forfeited  amounts may be applied to plan expenses
    including legal, consulting,  education materials, etc. or to reduce Company
    contributions.

    In the event of whole or partial termination of the Plan, there will be full
    and immediate vesting of each affected employee's account balance.

    5.  Payment of Benefits
        -------------------

    All benefits under the Plan are paid as lump-sum distributions. Beginning on
    July 1, 2000, distributions of Comcast Corporation stock can be taken in the
    form of stock. In-kind distributions are not specifically provided for under
    the Plan.

    6.  Loans to Participants
        ---------------------

    Smith Barney  Corporate  Trust Company (the Trustee) may make loans from the
    Plan to  participants  in accordance  with the Plan  document.  All loans to
    participants  are  considered  investments of the trust fund and bear market
    rates of interest.  All loans are to be repaid  within five years unless the
    loan is used to acquire a principal residence, in which case the term may be
    longer.

    7.  Income Tax Status
        -----------------

    The IRS issued a  determination  letter to the Plan,  dated April 29,  2003,
    stating that the Plan was  qualified  under  Section  401(a) of the Internal
    Revenue Code (the Code) and,  therefore,  is exempt from federal  income tax
    under Section 501(a) of the Code. The Plan has been amended since  receiving
    the determination letter. However, the Plan Administrator and the Plan's tax
    counsel believe that the Plan is designed and is currently being operated in
    compliance with the applicable requirements of the Code.




                                       7



                          Comcast-Spectacor 401(k) Plan

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 2003 and 2002

NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    1.  Valuation of Investments and Income Recognition
        -----------------------------------------------

    Plan  assets are stated at fair  value.  The fair value of money  market and
    mutual funds is determined by quoted market price.  The change in fair value
    of assets  during the year is  measured by the  difference  between the fair
    value at year-end  and the fair value at the  beginning of the year or costs
    of purchases during the year and is reflected in the statement of changes in
    net assets  available  for  benefits  as net  appreciation  in fair value of
    investments.

    Participant loans are stated at their outstanding balances.

    Purchases  and sales of  securities  are  recorded  on a  trade-date  basis.
    Interest income is recorded on the accrual basis.  Dividends are recorded on
    the ex-dividend date.

    2.  Use of Estimates
        ----------------

    In preparing financial  statements in conformity with accounting  principles
    generally  accepted in the United States of America,  management is required
    to make estimates and assumptions that affect the reported amounts of assets
    and liabilities,  the disclosure of contingent assets and liabilities at the
    date of the financial statements,  and the reported amounts of additions and
    deductions  during the reporting  period.  Actual  results could differ from
    those estimates.

NOTE C - INVESTMENTS

    The fair market value of  investments  held by the Plan  representing  5% or
    more of the Plan's assets are identified below.




                                                                   
                            FAIR VALUE OF INVESTMENTS
                                                                December 31,
                                                          2003               2002
                                                     -------------      -------------
Investments at fair value
   BlackRock Balanced Class A                         $     --           $1,605,091
   BlackRock Index Equity Class A                           --              567,768
   BlackRock Large Value Class A                            --              766,716
   BlackRock Small Value Class A                            --              831,786
   Janus Adviser Growth & Income                            --              976,812
   Janus Adviser Worldwide                                  --              579,252
   Fidelity Advisor Growth Opportunities Fund               --              554,941
   Comcast Common Stock                                3,443,585          1,709,681
   BlackRock Money Market                                   --              776,930
   BlackRock Managed Income Class A                         --              704,933
   Smith Barney Money Market-Government Portfolio      1,445,111               --
   EuroPacific Growth Fund-F Share                     1,000,756               --
   Washington Mutual Investors Fund-F Share            2,142,975               --
   Growth Fund of America-F Share                      2,107,787               --
   Baron Growth Fund                                     873,951               --
   Janus Balanced Fund                                 1,214,204               --
   Strong Government Securities Fund                   1,016,613               --
   Royce Total Return Fund                             1,061,822               --




                                   (Continued)


                                       8



                          Comcast-Spectacor 401(k) Plan

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 2003 and 2002



NOTE C - INVESTMENTS - Continued

    During 2003, the Plan's investments appreciated in value as follows:

                            NET CHANGE IN FAIR VALUE

                                                        Year ended
                                                       December 31,
                                                           2003
                                                       -----------

       Common Stock                                  $     620,220
       Mutual Funds                                      1,605,475
                                                       -----------

                                                     $   2,225,695
                                                       ===========

NOTE D - TRUST AGREEMENT

    Comcast-Spectacor,  L.P.,  as Plan Sponsor,  entered into a trust  agreement
    with Smith Barney Corporate Trust Company  (Trustee),  a  party-in-interest.
    Under the  terms of this  agreement,  the  Trustee  will  hold,  invest  and
    reinvest the funds. Comcast-Spectacor,  L.P. has no right, title or interest
    in or to the trust fund maintained under this agreement.

NOTE E - PLAN TERMINATION

    Although  it has  not  expressed  any  intent  to do so,  each  entity  that
    constitutes  the  Company has the right  under the Plan to  discontinue  its
    contributions  and to terminate the Plan, with the respect to its employees.
    Additionally,  Comcast-Spectacor,  L.P. has the right to terminate the Plan.
    In the event of Plan  termination,  participants  will become 100% vested in
    their accounts.

NOTE F - RECONCILIATION TO FORM 5500

    The following is a  reconciliation  of net assets available for benefits per
    the financial statements to Form 5500:




                                                                                                   December 31,
                                                                                              2003               2002
                                                                                          -------------      -------------
                                                                                                       
       Net assets available for benefits per the financial statements                     $  16,322,173      $  11,306,469
       Less contribution receivable (1)                                                               -            212,865
                                                                                            -----------        -----------

          Assets available for benefits per Form 5500                                     $  16,322,173      $  11,093,604
                                                                                           ============       ============




(1)  Amount  represents the difference  between amount accrued for  contribution
     receivable per Form 5500 and the financial  statements.  Form 5500 does not
     accrue  for a  contribution  receivable  through  December  31,  2002.  The
     financial statement accrued a contribution  receivable through December 31,
     2002 due to the change in plan  administrator  that  occurred at  year-end.
     Participant  deferrals,  loan repayments and employer  matches were held in
     the trust at year-end  and not  allocated  to  participant  accounts  until
     January 2003 by the new plan administrator.

                                   (Continued)


                                       9



                          Comcast-Spectacor 401(k) Plan

                    NOTES TO FINANCIAL STATEMENTS - CONCLUDED

                           December 31, 2003 and 2002



NOTE F - RECONCILIATION TO FORM 5500 - Continued

    The following is a reconciliation of contributions  made to the Plan per the
    financial statements to Form 5500:

                                                                    Year ended
                                                                    December 31,
                                                                        2003
                                                                    -----------

   Contributions made to the Plan per the financial statements    $   3,379,344
   Contribution receivable at December 31, 2002                         212,865
                                                                    -----------

      Contributions made to the Plan per Form 5500                $   3,592,209
                                                                   ============






                                       10







                                                                                   
                          Comcast-Spectacor 401(k) Plan

                                 EIN 23-2303756
                                  Plan No. 004

     SCHEDULE H - LINE 4i - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES

                                December 31, 2003





                                                   (c) Description of investment,
                b) Identity of                         including maturity date,       (d) Fair
                   issue, borrower,                     rate of interest, par           or current
  (a)              lessor or similar party                or maturity value               value
-------  -----------------------------------------  -----------------------------     -------------

   *     Salomon Smith Barney
           participant loans receivable                    Participant Loans       $    284,370
         EuroPacific Growth Fund - F Share                    Mutual fund             1,000,756
         Washington Mutual Investors Fund - F Share           Mutual fund             2,142,975
         The Growth Fund of America - F Share                 Mutual fund             2,107,787
   *     Comcast Common Stock                                Common Stock             3,443,585
         Baron Growth Fund                                    Mutual fund               873,951
         Cohen and Steers Realty Shares                       Mutual fund               217,606
         Dreyfus Appreciation Fund                            Mutual fund               100,274
         Dreyfus US Treasury Long Term Fund                   Mutual fund               224,758
         Dreyfus Premier Emerging Markets Fund                Mutual fund               593,469
         ING GNMA Income Fund                                 Mutual fund               229,849
         Janus Balanced Fund                                  Mutual fund             1,214,204
         Strong Government Securities Fund                    Mutual fund             1,016,613
         Royce Total Return Fund                              Mutual fund             1,061,822
         Smith Barney Money Market - Government Portfolio     Mutual fund             1,445,111
         T Rowe Price International Bond Advisor              Mutual fund               128,256
         Navellier Mid Cap Growth                             Mutual fund               236,778
         Credit Suisse Global Fixed Income Fund               Mutual fund                     9
                                                                                 ---------------
                                                                                   $ 16,322,173
                                                                                 ===============

         *Party-in-interest





                                       11






            Consent of Independent Registered Public Accounting Firm
            --------------------------------------------------------


         We have  issued  our  report  dated  June 11,  2004,  accompanying  the
financial statements and supplemental schedule of Comcast-Spectacor  401(k) Plan
on Form 11-K for the year ended  December  31,  2003.  We hereby  consent to the
incorporation  by  reference  of said report in the  Registration  Statement  of
Comcast Corporation on Form S-8 (File No. 333-101295, effective 11/19/02).





/s/ Grant Thornton LLP
Philadelphia, Pennsylvania
June 28, 2004





                                       12






                                   Signatures
                                   ----------


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
trustees (or other persons who administer  the employee  benefit plan) have duly
caused this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.




                                             COMCAST-SPECTACOR
                                             401(k) PLAN


                                             By:  Comcast Corporation



June 28, 2004                                By:  /s/ Lawrence J. Salva
                                                  ---------------------
                                                    Lawrence J. Salva
                                                    Senior Vice President and
                                                    Controller




                                       13