<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): September 1, 2005

                         MERRILL LYNCH DEPOSITOR, INC.
                    (ON BEHALF OF PPLUS TRUST SERIES DCC-1)
             (Exact name of registrant as specified in its charter)

            DELAWARE             001-31760                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
                  DCC-1 on September 1, 2005.

                           For information with respect to the underlying
                  securities held by PPLUS Trust Series DCC-1, please refer to
                  DaimlerChrysler AG's (Commission file number 001-14561)
                  periodic reports, including annual reports on Form 20-F and
                  current reports on Form 6-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, the guarantee, the
                  underlying securities issuer or the underlying securities
                  guarantor contained in the prospectus related to the
                  underlying securities or in the underlying securities issuer's
                  or 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 or the underlying securities guarantor
                  (including, without limitation, no investigation as to their
                  financial condition or creditworthiness) or of the underlying
                  securities or the guarantee 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 you were investing directly
                  in the underlying securities and the guarantee 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, the
                  guarantee, the underlying securities issuer or 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.

                           Not applicable.

                  (b)      Pro forma financial information.

                           Not applicable.

                  (c)      Exhibits.

                           99.1     Trustee's report in respect of the September
                                    1, 2005 distribution to holders of the PPLUS
                                    Trust Certificates Series DCC-1.

                                   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: September 7, 2005             By:    /s/ Stephan Kuppenheimer
                                                    ----------------------------
                                             Name:  Stephan Kuppenheimer
                                             Title: President



                                 EXHIBIT INDEX


                  99.1     Trustee's report in respect of the September 1, 2005
                           distribution to holders of the PPLUS Trust
                           Certificates Series DCC-1.
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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): September 1, 2005

                         MERRILL LYNCH DEPOSITOR, INC.
                    (ON BEHALF OF PPLUS TRUST SERIES DCC-1)
             (Exact name of registrant as specified in its charter)

            DELAWARE             001-31760                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
                  DCC-1 on September 1, 2005.

                           For information with respect to the underlying
                  securities held by PPLUS Trust Series DCC-1, please refer to
                  DaimlerChrysler AG's (Commission file number 001-14561)
                  periodic reports, including annual reports on Form 20-F and
                  current reports on Form 6-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, the guarantee, the
                  underlying securities issuer or the underlying securities
                  guarantor contained in the prospectus related to the
                  underlying securities or in the underlying securities issuer's
                  or 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 or the underlying securities guarantor
                  (including, without limitation, no investigation as to their
                  financial condition or creditworthiness) or of the underlying
                  securities or the guarantee 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 you were investing directly
                  in the underlying securities and the guarantee 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, the
                  guarantee, the underlying securities issuer or 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.

                           Not applicable.

                  (b)      Pro forma financial information.

                           Not applicable.

                  (c)      Exhibits.

                           99.1     Trustee's report in respect of the September
                                    1, 2005 distribution to holders of the PPLUS
                                    Trust Certificates Series DCC-1.

                                   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: September 7, 2005             By:    /s/ Stephan Kuppenheimer
                                                    ----------------------------
                                             Name:  Stephan Kuppenheimer
                                             Title: President

                                 EXHIBIT INDEX

                  99.1     Trustee's report in respect of the September 1, 2005
                           distribution to holders of the PPLUS Trust
                           Certificates Series DCC-1.