SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                  SCHEDULE 13G*
                                 (Rule 13d-102)

                                 Amendment No. *


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                              PURSUANT TO 13d-2(b)

                           Kaiser Aluminum Corporation


                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    483007704
                                 (CUSIP Number)

                               September 25, 2006
             (Date of event which requires filing of this statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule 13G is filed:
     [ ]  Rule 13d-1(b)
     [x]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)





                              (Page 1 of 11 Pages)
----------------
     *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).






CUSIP No. 483007704                  13G                    Page 2 of 11 Pages

-----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                           Owl Creek I, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                -0-
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                55,096
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                55,096
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                55,096
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                0.3%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                PN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 483007704                  13G                    Page 3 of 11 Pages

-----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                          Owl Creek II, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                -0-
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                472,960
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                472,960
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                472,960
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                2.3%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                PN
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 483007704                  13G                    Page 4 of 11 Pages

-----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                     Owl Creek Advisors, LLC
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                -0-
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                528,056
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                528,056
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                528,056
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                2.6%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                CO
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 483007704                  13G                    Page 5 of 11 Pages

-----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                            Owl Creek Asset Management, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                -0-
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                878,123
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                878,123
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                878,123
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                4.3%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                PN
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 483007704                  13G                    Page 6 of 11 Pages

-----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                           Jeffrey A. Altman
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            United States
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                -0-
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                1,406,179
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                -0-
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                1,406,179
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                1,406,179
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                6.9%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON ** IN
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 483007704                  13G                    Page 7 of 11 Pages

Item 1(a).     Name of Issuer:

     The name of the issuer is Kaiser Aluminum Corporation (the "Issuer").

Item 1(b).     Address of Issuer's Principal Executive Offices:

     The Issuer's principal executive offices are located at 27422 Portola
Parkway, Suite 350, Foothill Ranch, California 92610-2831


Item 2(a).     Name of Person Filing:

     This statement is filed by:

            (i) Owl Creek I, L.P., a Delaware limited partnership, ("Owl
            Creek I") with respect to the shares of Common Stock directly
            owned by it;

            (ii) Owl Creek II, L.P., a Delaware limited partnership, ("Owl
            Creek II") with respect to the shares of Common Stock directly
            owned by it;

            (iii) Owl Creek Advisors, LLC, a Delaware limited liability
            company (the "General Partner"), with respect to the shares of
            Common Stock directly owned by Owl Creek I and Owl Creek II;

            (iv) Owl Creek Asset Management, L.P. a Delaware limited
            partnership (the "Investment Manager"), with respect to the
            shares of Common Stock directly owned by Owl Creek Overseas
            Fund, Ltd., an exempted company organized under the laws of
            the Cayman Islands ("Owl Creek Overseas"), Owl Creek Overseas
            Fund II, Ltd., an exempted company organized under the laws of
            the Cayman Islands ("Owl Creek Overseas II"), and Owl Creek
            Socially Responsible Investment Fund, Ltd., an exempted
            company organized under the laws of the Cayman Islands ("Owl
            Creek SRI"); and

            (v) Jeffrey A. Altman, with respect to shares of Common Stock
            owned by Owl Creek I, Owl Creek II, Owl Creek Overseas, Owl
            Creek Overseas II and Owl Creek SRI.

     The foregoing persons are hereinafter sometimes collectively referred to as
the "Reporting Persons." Any disclosures herein with respect to persons other
than the Reporting Persons are made on information and belief after making
inquiry to the appropriate party.

Item 2(b).     Address of Principal Business Office or, if None, Residence:

     The address of the principal business office of each of the Reporting
Persons is 640 Fifth Avenue, 20th Floor, New York, NY 10019.






CUSIP No. 483007704                  13G                    Page 8 of 11 Pages

Item 2(c).     Citizenship:

     Each of Owl Creek I, Owl Creek II and the Investment Manager is a limited
partnership organized under the laws of the State of Delaware. The General
Partner is a limited liability company organized under the laws of the State of
Delaware. Mr. Altman is a United States citizen.

Item 2(d).     Title of Class of Securities:
Shares of Common Stock, par value $.01 par value per share (the "Common Stock").

Item 2(e).  CUSIP Number:  483007704

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a:

          (a) [ ]  Broker or dealer registered under Section 15 of the
                   Act,

          (b) [ ]  Bank as defined in Section 3(a)(6) of the Act,

          (c) [ ]  Insurance Company as defined in Section 3(a)(19) of
                   the Act,

          (d) [ ]  Investment Company registered under Section 8 of the
                   Investment Company Act of 1940,

          (e) [ ]  Investment Adviser in accordance with Rule
                   13d-1 (b)(1)(ii)(E),

          (f) [ ]  Employee Benefit Plan or Endowment Fund in accordance
                   with Rule 13d-1 (b)(1)(ii)(F),

          (g) [ ]  Parent Holding Company or control person in accordance
                   with Rule 13d-1 (b)(1)(ii)(G),

          (h) [ ]  Savings Association as defined in Section 3(b) of the
                   Federal Deposit Insurance Act,

          (i) [ ]  Church Plan that is excluded from the definition of an
                   investment company under Section 3(c)(14) of the
                   Investment Company Act of 1940,

          (j) [ ]  Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

     Not applicable






CUSIP No. 483007704                  13G                   Page 9 of 11 Pages

Item 4.   Ownership.

      A. Owl Creek I, L.P.
             (a) Amount beneficially owned: 55,096
             (b) Percent of class: 0.3%. The percentages used herein and in
the rest of Item 4 are calculated based upon the 20,516,803 shares Common Stock
that are outstanding as of July 31, 2006 as reported by the Company in its Form
10-Q filed on August 14, 2006.
             (c)(i) Sole power to vote or direct the vote: 0
               (ii) Shared power to vote or direct the vote: 55,096
              (iii) Sole power to dispose or direct the disposition: 0
                (iv)Shared power to dispose or direct the disposition: 55,096

      B. Owl Creek II, L.P.
             (a) Amount beneficially owned: 472,960
             (b) Percent of class: 2.3%
             (c)(i) Sole power to vote or direct the vote: 0
               (ii) Shared power to vote or direct the vote: 472,960
              (iii) Sole power to dispose or direct the disposition: 0
               (iv) Shared power to dispose or direct the disposition: 472,960

      C. Owl Creek Advisors, LLC
             (a) Amount beneficially owned: 528,056
             (b) Percent of class: 2.6%
             (c)(i) Sole power to vote or direct the vote: 0
               (ii) Shared power to vote or direct the vote: 528,056
              (iii) Sole power to dispose or direct the disposition: 0
               (iv) Shared power to dispose or direct the disposition: 528,056

      D. Owl Creek Asset Management, L.P.
             (a) Amount beneficially owned: 878,123
             (b) Percent of class: 4.3%
             (c)(i) Sole power to vote or direct the vote: 0
               (ii) Shared power to vote or direct the vote: 878,123
              (iii) Sole power to dispose or direct the disposition: 0
               (iv) Shared power to dispose or direct the disposition: 878,123

      E. Jeffrey A. Altman
             (a) Amount beneficially owned: 1,406,179
             (b) Percent of class: 6.9%
             (c)(i) Sole power to vote or direct the vote: 0
               (ii) Shared power to vote or direct the vote: 1,406,179
              (iii) Sole power to dispose or direct the disposition: 0
               (iv) Shared power to dispose or direct the disposition: 1,406,179

Item 5.     Ownership of Five Percent or Less of a Class.

     Not Applicable.






CUSIP No. 483007704                  13G                   Page 10 of 11 Pages

Item 6.     Ownership of More than Five Percent on Behalf of Another Person.

     Owl Creek Advisors, LLC, the general partner of Owl Creek I and Owl Creek
II, has the power to direct the affairs of Owl Creek I and Owl Creek II,
including decisions respecting the receipt of dividends from, and the
disposition of the proceeds from the sale of, the shares. Owl Creek Asset
Management, L.P., as the investment manager to Owl Creek Overseas, Owl Creek
Overseas II and Owl Creek SRI, has the power to direct the investment activities
of Owl Creek Overseas, Owl Creek Overseas II and Owl Creek SRI, including
decisions respecting the receipt of dividends from, and the disposition of the
proceeds from the sale of, the shares. Mr. Altman is the managing member of Owl
Creek Advisors, LLC and the managing member of the general partner of Owl Creek
Asset Management, L.P. and in that capacity directs their operations.

Item 7.     Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company.

     Not Applicable.

Item 8.  Identification and Classification of Members of the Group.

     Not Applicable.

Item 9.  Notice of Dissolution of Group.

     Not Applicable.

Item 10.  Certification.

     Each of the Reporting Persons hereby makes the following certification:

          By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.






CUSIP No. 483007704                  13G                   Page 11 of 11 Pages

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


DATED:  October 5, 2006

                                    /s/ Jeffrey A. Altman
                                    ---------------------
                                 Jeffrey A. Altman, individually, and as
                                 managing member of Owl Creek Advisors, LLC,
                                 for itself and as general partner of
                                 Owl Creek I, L.P. and Owl Creek II L.P.,
                                 and as managing member of the general
                                 partner of Owl Creek Asset Management, L.P.,
                                 for itself and as investment manager to Owl
                                 Creek Overseas Fund, Ltd., Owl Creek
                                 Overseas Fund II, Ltd. and Owl Creek Socially
                                 Responsible Investment Fund, Ltd.