<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

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

       Date of Report (Date of earliest event reported): November 15, 2005

                          MERRILL LYNCH DEPOSITOR, INC.
                     (ON BEHALF OF PPLUS TRUST SERIES GSC-2)
             (Exact name of registrant as specified in its charter)

            DELAWARE             001-32247                    13-3891329
        (State or other        (Commission                (I. R. S. Employer
        jurisdiction  of        File Number)              Identification No.)
         incorporation)

     WORLD FINANCIAL CENTER,                                     10080
       NEW YORK, NEW YORK                                     (Zip Code)
      (Address of principal
       executive offices)

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

       Registrant's telephone number, including area code: (212) 449-1000

                      INFORMATION TO BE INCLUDED IN REPORT


SECTION 1.        REGISTRANT'S BUSINESS AND OPERATIONS

                  Not applicable.

SECTION 2.        FINANCIAL INFORMATION

                  Not applicable.

SECTION 3.        SECURITIES AND TRADING MARKETS

                  Not applicable.

SECTION 4.        MATTERS RELATED TO ACCOUNTANTS AND FINANCIAL STATEMENTS

                  Not applicable.

SECTION 5.        CORPORATE GOVERNANCE AND MANAGEMENT

                  Not applicable.
<PAGE>

SECTION 6.        [RESERVED]

SECTION 7.        REGULATION FD

                  Not applicable.

SECTION 8.        OTHER EVENTS

    ITEM 8.01     OTHER EVENTS

       99.1       Distribution to holders of the PPLUS Trust Certificates
                  Series GSC-2 on November 15, 2005.

                           For information with respect to the
                  underlying securities held by PPLUS Trust Series
                  GSC-2, please refer to The Goldman Sachs Group,
                  Inc.'s (Commission file number 001-14965) periodic
                  reports, including annual reports on Form 10-K,
                  quarterly reports on Form 10-Q and current reports on
                  Form 8-K, and other information on file with the
                  Securities and Exchange Commission (the "SEC"). You
                  can read and copy these reports and other information
                  at the public reference facilities maintained by the
                  SEC at Room 1580, 100 F Street, NE, Washington, D.C.
                  20549. You may obtain copies of this material for a
                  fee by writing to the SEC's Public Reference Section
                  of the SEC at 100 F Street, NE, Washington, D.C.
                  20549. You may obtain information about the operation
                  of the Public Reference Room by calling the SEC at
                  1-800-SEC-0330. You can also access some of this
                  information electronically by means of the SEC's
                  website on the Internet at http://www.sec.gov, which
                  contains reports, proxy and information statements
                  and other information that the underlying securities
                  guarantor and the underlying securities issuer has
                  filed electronically with the SEC.

                           Although we have no reason to believe the
                  information concerning the underlying securities and
                  the junior subordinated debentures or the underlying
                  securities issuer and the underlying securities
                  guarantor contained in the underlying securities
                  guarantor's Exchange Act reports is not reliable,
                  neither the depositor nor the trustee participated in
                  the preparation of such documents or made any due
                  diligence inquiry with respect to the information
                  provided therein. No investigation with respect to
                  the underlying securities issuer and the underlying
                  securities guarantor (including, without limitation,
                  no investigation as to their financial condition or
                  creditworthiness) or of the underlying securities and
                  the junior subordinated debentures has been made. You
                  should obtain and evaluate the same information
                  concerning the underlying securities issuer and the
                  underlying securities guarantor as you would obtain
                  and evaluate if your investment were directly in the
                  underlying securities or in other securities issued
                  by the underlying securities issuer or the underlying
                  securities guarantor. There can be no assurance that
                  events affecting the underlying securities and the
                  junior subordinated debentures or the underlying
                  securities issuer and the underlying securities
                  guarantor have not occurred or have not yet been
                  publicly disclosed which would affect the accuracy or
                  completeness of the publicly available documents
                  described above.
<PAGE>

SECTION 9.        FINANCIAL STATEMENTS AND EXHIBITS

    ITEM 9.01     FINANCIAL STATEMENTS AND EXHIBITS

        (a)       Financial statements of business acquired.

                  None.

        (b)       Pro forma financial information.

                  None.

        (c)       Exhibits.

                    99.1        Trustee's report in respect of the November 15,
                                2005 distribution to holders of the PPLUS Trust
                                Certificates Series GSC-2.



                                   SIGNATURES

                  Pursuant to the requirements of the Securities Exchange Act of
                  1934, the registrant has duly caused this report to be signed
                  on its behalf by the undersigned, hereunto duly authorized.


                                           MERRILL LYNCH DEPOSITOR, INC.

         Date: 11-28-05               By:  /s/ Stephan Kuppenheimer
                                           -------------------------------
                                           Name:    Stephan Kuppenheimer
                                           Title:   President


<PAGE>

                                  EXHIBIT INDEX


              99.1         Trustee's report in respect of the November 15,
                           2005 distribution to holders of the PPLUS Trust
                           Certificates Series GSC-2.
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{"company-data": {"conformed-name": "PPLUS Trust Series GSC-2", "cik": "0001294808", "assigned-sic": "6189", "irs-number": "000000000", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-32247", "film-number": "051228418"}, "business-address": {"street1": "WORLD FINANCIAL CENTER", "city": "NEW YORK", "state": "NY", "zip": "10281", "phone": "2124491000"}}
SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

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

       Date of Report (Date of earliest event reported): November 15, 2005

                          MERRILL LYNCH DEPOSITOR, INC.
                     (ON BEHALF OF PPLUS TRUST SERIES GSC-2)
             (Exact name of registrant as specified in its charter)

            DELAWARE             001-32247                    13-3891329
        (State or other        (Commission                (I. R. S. Employer
        jurisdiction  of        File Number)              Identification No.)
         incorporation)

     WORLD FINANCIAL CENTER,                                     10080
       NEW YORK, NEW YORK                                     (Zip Code)
      (Address of principal
       executive offices)

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

       Registrant's telephone number, including area code: (212) 449-1000

                      INFORMATION TO BE INCLUDED IN REPORT

SECTION 1.        REGISTRANT'S BUSINESS AND OPERATIONS

                  Not applicable.

SECTION 2.        FINANCIAL INFORMATION

                  Not applicable.

SECTION 3.        SECURITIES AND TRADING MARKETS

                  Not applicable.

SECTION 4.        MATTERS RELATED TO ACCOUNTANTS AND FINANCIAL STATEMENTS

                  Not applicable.

SECTION 5.        CORPORATE GOVERNANCE AND MANAGEMENT

                  Not applicable.
SECTION 6.        [RESERVED]

SECTION 7.        REGULATION FD

                  Not applicable.

SECTION 8.        OTHER EVENTS

    ITEM 8.01     OTHER EVENTS

       99.1       Distribution to holders of the PPLUS Trust Certificates
                  Series GSC-2 on November 15, 2005.

                           For information with respect to the
                  underlying securities held by PPLUS Trust Series
                  GSC-2, please refer to The Goldman Sachs Group,
                  Inc.'s (Commission file number 001-14965) periodic
                  reports, including annual reports on Form 10-K,
                  quarterly reports on Form 10-Q and current reports on
                  Form 8-K, and other information on file with the
                  Securities and Exchange Commission (the "SEC"). You
                  can read and copy these reports and other information
                  at the public reference facilities maintained by the
                  SEC at Room 1580, 100 F Street, NE, Washington, D.C.
                  20549. You may obtain copies of this material for a
                  fee by writing to the SEC's Public Reference Section
                  of the SEC at 100 F Street, NE, Washington, D.C.
                  20549. You may obtain information about the operation
                  of the Public Reference Room by calling the SEC at
                  1-800-SEC-0330. You can also access some of this
                  information electronically by means of the SEC's
                  website on the Internet at http://www.sec.gov, which
                  contains reports, proxy and information statements
                  and other information that the underlying securities
                  guarantor and the underlying securities issuer has
                  filed electronically with the SEC.

                           Although we have no reason to believe the
                  information concerning the underlying securities and
                  the junior subordinated debentures or the underlying
                  securities issuer and the underlying securities
                  guarantor contained in the underlying securities
                  guarantor's Exchange Act reports is not reliable,
                  neither the depositor nor the trustee participated in
                  the preparation of such documents or made any due
                  diligence inquiry with respect to the information
                  provided therein. No investigation with respect to
                  the underlying securities issuer and the underlying
                  securities guarantor (including, without limitation,
                  no investigation as to their financial condition or
                  creditworthiness) or of the underlying securities and
                  the junior subordinated debentures has been made. You
                  should obtain and evaluate the same information
                  concerning the underlying securities issuer and the
                  underlying securities guarantor as you would obtain
                  and evaluate if your investment were directly in the
                  underlying securities or in other securities issued
                  by the underlying securities issuer or the underlying
                  securities guarantor. There can be no assurance that
                  events affecting the underlying securities and the
                  junior subordinated debentures or the underlying
                  securities issuer and the underlying securities
                  guarantor have not occurred or have not yet been
                  publicly disclosed which would affect the accuracy or
                  completeness of the publicly available documents
                  described above.
SECTION 9.        FINANCIAL STATEMENTS AND EXHIBITS

    ITEM 9.01     FINANCIAL STATEMENTS AND EXHIBITS

        (a)       Financial statements of business acquired.

                  None.

        (b)       Pro forma financial information.

                  None.

        (c)       Exhibits.

                    99.1        Trustee's report in respect of the November 15,
                                2005 distribution to holders of the PPLUS Trust
                                Certificates Series GSC-2.

                                   SIGNATURES

                  Pursuant to the requirements of the Securities Exchange Act of
                  1934, the registrant has duly caused this report to be signed
                  on its behalf by the undersigned, hereunto duly authorized.

                                           MERRILL LYNCH DEPOSITOR, INC.

         Date: 11-28-05               By:  /s/ Stephan Kuppenheimer
                                           -------------------------------
                                           Name:    Stephan Kuppenheimer
                                           Title:   President
EXHIBIT INDEX

              99.1         Trustee's report in respect of the November 15,
                           2005 distribution to holders of the PPLUS Trust
                           Certificates Series GSC-2.