UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A
                                (Amendment No. 2)

|X|            ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 2005
                                       OR

|_|            TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

           For the transition period from ____________ to ____________

                        Commission file number: 000-21644

                            CRIMSON EXPLORATION INC.
             (Exact name of registrant as specified in its charter)

                      Delaware                             20-3037840
           (State or other jurisdiction of              (I.R.S. Employer
            incorporation or organization)             Identification No.)

      480 N. Sam Houston Parkway East, Suite 300
                    Houston, Texas                            77060
       (Address of principal executive offices)             (Zip Code)

                                 (281) 820-1919
              (Registrant's telephone number, including area code)

           Securities registered pursuant to Section 12(b) of the Act:


   Securities registered pursuant to Section 12(g) of the Act: Common Stock,
                           $0.001 par value per share

Indicate by check mark if the registrant is a well-known seasoned issuer, as
defined in Rule 405 of the Securities Act.  Yes [ ]  No [X]

Indicate by check mark if the registrant is not required to file reports
pursuant to Section 13 or Section 15(d) of the Exchange Act.  Yes [ ]  No [X]

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.  Yes [X]  No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an
accelerated filer, or a non-accelerated filer. See definition of "accelerated
filer" and "large accelerated filer" in Rule 12b-2 of the Exchange Act.

Large accelerated filer [ ]  Accelerated filer [ ]  Non-accelerated filer [X]

Indicate by check mark whether the registrant is a shell company (as defined in
Rule 12b-2 of the Exchange Act).  Yes [ ]  No [X]

As of June 30, 2005, the aggregate market value of the registrant's common stock
held by non-affiliates of the registrant was $18,010,865 based on the closing
sales price of $0.98 of the common stock. For purposes of this computation, all
executive officers, directors and 10% beneficial owners of the registrant are
deemed to be affiliates. Such a determination should not be deemed an admission
that such executive officers, directors and 10% beneficial owners are
affiliates.

On March 29, 2006, there were 33,041,332 shares of common stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of our Definitive Proxy Statement for the 2006 Annual Meeting, expected
to be filed within 120 days of our fiscal year end, are incorporated by
reference into Part III.





                                EXPLANATORY NOTE

       The purpose of this Amendment No. 2 on Form 10-K/A to the Crimson
Exploration Inc. Annual Report on Form 10-K for the year ended December 31, 2005
(the "Original Filing") is to file a corrected Exhibit 23.2 to replace Exhibit
23.2 that was mistakenly filed as part of Amendment No. 1 on Form 10-K/A. No
other changes have been made to the Original Filing.







                                   SIGNATURES

       Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                               CRIMSON EXPLORATION INC.

Date:  June 8, 2006                            By:  /s/ Allan D. Keel
                                                  ------------------------------
                                                    Allan D. Keel, President

       Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons, on behalf of the
registrant, and in the capacities and on the dates indicated.


         Signature                          Title                      Date
---------------------------  -----------------------------------  --------------


/s/ Allan D. Keel            President, Chief Executive Officer    June 8, 2006
-----------------            and Director
Allan D. Keel


/s/ E. Joseph Grady          Senior Vice President and             June 8, 2006
-------------------          Chief Financial Officer
E. Joseph Grady


/s/ Richard L. Creel         Vice President Finance and            June 8, 2006
--------------------         Chief Accounting Officer
Richard L. Creel


/s/ Skardon F. Baker*        Director                              June 8, 2006
--------------------
Skardon F. Baker


/s/ B. James Ford*           Director                              June 8, 2006
-----------------
B. James Ford


/s/ Lon Mc Cain*             Director                              June 8, 2006
---------------
Lon Mc Cain


/s/ Lee B. Backsen*          Director                              June 8, 2006
------------------
Lee B. Backsen


*/s/ Allan D. Keel
 -----------------
 Allan D. Keel,
 Attorney-in Fact
 pursuant to a power
 of attorney previously
 granted





                                INDEX TO EXHIBITS

     Number         Description
     ------         -----------

     2.1**          Agreement and Plan of Merger, dated March 14, 2006, among
                    Crimson Exploration, Inc., Crimson Exploration Operating,
                    Inc., Core Natural Resources, Inc. and its stockholders.


     3.1            Certificate of Incorporation of the Registrant. (Previously
                    filed on our current report on Form 8-K filed July 5, 2005.)

     3.2            Certificate of Designation, Preferences and Rights of Series
                    D Preferred Stock. (Previously filed on our current report
                    on Form 8-K filed July 5, 2005.)

     3.3            Certificate of Designation, Preferences and Rights of
                    Cumulative Convertible Preferred Stock, Series E.
                    (Previously filed on our current report on Form 8-K filed
                    July 5, 2005.)

     3.4            Certificate of Designation, Preferences and Rights of Series
                    G Convertible Preferred Stock. (Previously filed on our
                    current report on Form 8-K filed July 5, 2005.)

     3.5            Certificate of Designation, Preferences and Rights of Series
                    H Convertible Preferred Stock. (Previously filed on our
                    current report on Form 8-K filed July 5, 2005.)

     3.6            Bylaws of the Registrant. (Previously filed on our current
                    report on Form 8-K filed July 5, 2005.)

     4.1            Letter Agreement by and among GulfWest Energy Inc., a Texas
                    corporation, GulfWest Oil & Gas Company and the investors
                    listed on the signature page thereof, dated April 22, 2004.
                    (Previously filed with our Current Report on Form 8-K, dated
                    April 29, 2004 and filed with the Commission on May 10,
                    2004.)

     4.2            Warrant Agreement made by and between GulfWest Energy Inc.,
                    and Highbridge/Zwirn Special Opportunities FUND, L.P., and
                    Drawbridge Special Opportunities Fund LP, Grantees, dated
                    and effective April 29, 2004. (Previously filed with our
                    Current Report on Form 8-K dated April 29, 2004 and filed
                    with the Commission on May 10, 2004.)

     4.3            Shareholders Rights Agreement between GulfWest Energy Inc.
                    and OCM GW Holdings, LLC dated February 28, 2005.
                    (Previously filed with the Form 13D, Reg. No. 005-54301,
                    filed with the Commission on March 10, 2005.)

     4.4            Omnibus and Release Agreement among GulfWest Energy Inc.,
                    OCM GW Holdings, LLC and those signatories set forth on the
                    signature page thereto, dated as of February 28, 2005.
                    (Previously filed with the Form 13D, Reg. No. 005-54301,
                    filed with the Commission on March 10, 2005.)

     4.5            Share Transfer Restriction Agreement between J. Virgil
                    Waggoner and OCM GW Holdings, LLC, dated February 28, 2005.
                    (Previously filed with the Form 13D, Reg. No. 005-54301,
                    filed with the Commission on March 10, 2005.)

     4.6            Irrevocable Proxy executed by J. Virgil Waggoner dated
                    February 28, 2005. (Previously filed with the Form 13D, Reg.
                    No. 005-54301, filed with the Commission on March 10, 2005.)

     4.7            Exchange Agreement between GulfWest Energy Inc. and GulfWest
                    Oil & Gas Company, dated February 28, 2005. (Previously
                    filed with our Annual Report on Form 10-K for the year ended
                    December 31, 2004, File No. 001-12108, filed with the
                    Commission on March 31, 2005.)




     4.8            Letter Agreement among OCM GW Holdings, LLC, OCM Principal
                    Opportunities Fund III, L.P., OCM Principal Opportunities
                    Fund III GP, LLC, Oaktree Capital Management, LLC, GulfWest
                    Energy Inc., GuflWest Oil & Gas Company and J. Virgil
                    Waggoner dated February 28, 2005 (Previously filed with our
                    Annual Report on Form 10-K for the year ended December 31,
                    2004, File No. 001-12108, filed with the Commission on March
                    31, 2005.)

     4.9            Subscription Agreement among OCM GW Holdings, LLC, Allan
                    D. Keel and those individuals listed on the signature page
                    thereto, dated February 28, 2005. (Previously filed with the
                    Form 13D, Reg. No. 005-54301, filed with the Commission on
                    March 10, 2005.)


     4.10           First Amendment to Warrant Agreement among GulfWest Energy
                    Inc., D.B. Zwirn Special Opportunities Fund, L.P. and
                    Drawbridge Special Opportunities Fund, dated February 28,
                    2005. (Previously filed with our Annual Report on Form 10-K
                    for the year ended December 31, 2004, File No. 001-12108,
                    filed with the Commission on March 31, 2005.)

     4.11**         Registration Rights Agreement, dated March 20, 2006, among
                    Crimson Exploration Inc. and the stockholders of Core
                    Natural Resources, Inc.

     10.1           Employment Agreement between Allan D. Keel and GulfWest
                    Energy, Inc., dated February 28, 2005. (Previously filed
                    with our Annual Report on Form 10-K for the year ended
                    December 31, 2004, File No. 001-12108, filed with the
                    Commission on March 31, 2005.)

     10.2           Employment Agreement between E. Joseph Grady and GulfWest
                    Energy, Inc., dated February 28, 2005. (Previously filed
                    with our Annual Report on Form 10-K for the year ended
                    December 31, 2004, File No. 001-12108, filed with the
                    Commission on March 31, 2005.)

     10.3           GulfWest Oil Company 1994 Stock Option and Compensation
                    Plan, amended and restated as of April 1, 2001 and approved
                    by the shareholders on May 18, 2001. (Previously filed with
                    our Proxy Statement on Form DEF 14A, filed with the
                    Commission on April 16, 2001.)

     10.4           GulfWest Energy Inc. 2004 Stock Option Incentive Plan.
                    (Previously filed with our Annual Report on Form 10-K for
                    the year ended December 31, 2004, File No. 001-12108, filed
                    with the Commission on March 31, 2005.)

     10.5           GulfWest Energy Inc. 2005 Stock Option Incentive Plan.
                    (Previously filed with our Annual Report on Form 10-K for
                    the year ended December 31, 2004, File No. 001-12108, filed
                    with the Commission on March 31, 2005.)

     10.6**         Form of 2005 Stock Incentive Plan Stock Option Agreement.

     10.7           Form of Warrant Agreement. (Previously filed with our Annual
                    Report on Form 10-K for the year ended December 31, 2004,
                    File No. 001-12108, filed with the Commission on March 31,
                    2005.)

     10.8           Form of Indemnification Agreement for directors and
                    officers. (Previously filed with our Form 8-K, Reg. No.
                    001-12108, filedwith the Commission on July 21, 2005.)

     10.9           Letter Agreement among D.B. Zwirn Special Opportunities
                    Fund, LP, GulfWest Oil & Gas Company, and Drawbridge Special
                    Opportunities Fund, LP, dated January 7, 2005. (Previously
                    filed with our Annual Report on Form 10-K for the year ended
                    December 31, 2004, File No. 001-12108, filed with the
                    Commission on March 31, 2005.)




     10.10          Series G Subscription Agreement between GulfWest Energy Inc.
                    and OCM GW Holdings, LLC dated February 28, 2005.
                    (Previously filed with the Form 13D, Reg. No. 005-54301,
                    filed with the Commission on March 10, 2005.)

     10.11          Series A Subscription Agreement between GulfWest Oil & Gas
                    Company and OCW GW Holdings, LLC dated February 28, 2005.
                    (Previously filed with the Form 13D, Reg. No. 005-54301,
                    filed with the Commission on March 10, 2005.)

     10.12          Letter Agreement between W.L. Addison Investment, L.L.C.,
                    GulfWest Energy Inc., and Setex Oil and Gas Company dated
                    February 24, 2005 extending Option Agreement for the
                    Purchase of Oil and Gas Leases dated March 5, 2004.
                    (Previously filed with our Annual Report on Form 10-K for
                    the year ended December 31, 2004, File No. 001-12108, filed
                    with the Commission on March 31, 2005.)

     10.13          Letter Agreement between W.L. Addison Investment, L.L.C.,
                    GulfWest Energy Inc., and Setex Oil and Gas Company dated
                    July 15, 2004 extending Option Agreement for the Purchase of
                    Oil and Gas Leases dated March 5, 2004. (Previously filed
                    with our Annual Report on Form 10-K for the year ended
                    December 31, 2004, File No. 001-12108, filed with the
                    Commission on March 31, 2005.)

     10.14          Oil and Gas Property Acquisition, Exploration and
                    Development Agreement with Summit Investment Group-Texas,
                    L.L.C. effective December 1, 2001. (Previously filed with
                    our Registration Statement on Form S-1, Reg. No. 333-116048,
                    filed with the Commission on June 1, 2004.)

     10.15          Credit Facility between GulfWest Energy Inc. and
                    Highbridge/Zwirn Special Opportunities Fund, L.P., and
                    Drawbridge Special Opportunities Fund LP, Grantees, dated
                    and effective April 29, 2004. (Previously filed with our
                    Registration Statement on Form S-1, Reg. No. 333-116048,
                    filed with the Commission on June 1, 2004.)

     10.16          Employment Agreement between Tracy Price and GulfWest Energy
                    Inc., dated April 1, 2005. (Previously filed with our Post
                    Effective Amendment No. 1 to our Registration Statement on
                    Form S-1, Reg. No. 333-116048, filed with the Commission on
                    April 6, 2005.)

     10.17          Employment Agreement between Tommy Atkins and GulfWest
                    Energy Inc., dated April 1, 2005. (Previously filed with our
                    Post Effective Amendment No. 1 to our Registration Statement
                    on Form S-1, Reg. No. 333-116048, filed with the Commission
                    on April 6, 2005.)

     10.18          Employment Agreement between Jay S. Mengle and GulfWest
                    Energy Inc., dated April 1, 2005. (Previously filed with our
                    Post Effective Amendment No. 1 to our Registration Statement
                    on Form S-1, Reg. No. 333-116048, filed with the Commission
                    on April 6, 2005.)

     10.19          Employment Agreement between Thomas R. Kaetzer and GulfWest
                    Energy Inc., dated April 1, 2005. (Previously filed with our
                    Post Effective Amendment No. 1 to our Registration Statement
                    on Form S-1, Reg. No. 333-116048, filed with the Commission
                    on April 6, 2005.)

     10.20          Summary terms of June 2005 Director Compensation Plan.
                    (Previously filed with our Post Effective Amendment No. 2 to
                    our Registration Statement on Form S-1, Reg. No. 333-116048,
                    filed with the Commission on July 27, 2005.)

     10.21          Credit Agreement, dated July 15, 2005, among Crimson
                    Exploration Inc., Wells Fargo, N.A., as agent and a lender,
                    and each lender from time to time a party thereto.
                    (Previously filed with our Form 8-K, Reg. No. 001-12108,
                    filed with the Commission on July 21, 2005.)




     10.22          Form of director restricted stock grant. (Previously filed
                    with our Form 8-K, Reg. No. 001-12108, filed with the
                    Commission on July 21, 2005.)

     10.24          First Amendment to Credit Agreement, dated as of March 6,
                    2006, among Crimson Exploration, Inc., Crimson Exploration
                    Operating, Inc., LTW Pipeline Co., and Wells Fargo Bank,
                    National Association.

     21.1**         Subsidiaries of the Registrant.

     23.1**         Consent of Grant Thornton LLP.

     23.2*          Consent of Weaver and Tidwell, L.L.P.

     25             Power of Attorney.

     31.1*          Certification of Chief Executive Officer pursuant to Section
                    302 of the Sarbanes-Oxley Act of 2002

     31.2*          Certification of Chief Financial Officer pursuant to Section
                    302 of the Sarbanes-Oxley Act of 2002

     32.1**         Certification of Chief Executive Officer pursuant to
                    18.U.S.C Section 1350 pursuant to Section 906 of the
                    Sarbanes-Oxley Act of 2002; filed herewith.

     32.2**         Certification Chief Financial Officer pursuant to 18.U.S.C
                    Section 1350 pursuant to Section 906 of the Sarbanes-Oxley
                    Act of 2002; filed herewith.

*  Filed herewith

** Previously filed