UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                 SCHEDULE 13D


                   Under the Securities Exchange Act of 1934


                                 T-REX OIL, INC.
             ------------------------------------------------------
                                (Name of Issuer)

                         Common Stock, $0.001 per share
             ------------------------------------------------------
                         (Title of Class of Securities)

                                   75188R106
              ------------------------------------------------------
                                (CUSIP Number)

                              ECKHARDT HUBER-FLOTHO
                               Josef-Raps - Str 2
                            Munchen, Germany D-80805
                               011 49 89 324 4717
             ------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                 March 28, 2015
                 ---------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box. /_/

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose 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. 75188R106

1.   NAMES OF REPORTING PERSONS:

     Eckhardt Huber-Flotho

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):(a) /_/
                                                                         (b) /_/
3.   SEC USE ONLY:

4.   SOURCE OF FUNDS (SEE INSTRUCTIONS): N/A

5.   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
     OR 2(e): /_/

6.   CITIZENSHIP OR PLACE OF ORGANIZATION:

     Germany

                             7.  SOLE VOTING POWER:

                                 1,361,457
      NUMBER OF SHARES
      BENEFICIALLY OWNED     8.  SHARED VOTING POWER:
      BY EACH REPORTING
      PERSON WITH                488,241

                             9.  SOLE DISPOSITIVE POWER:

                                 1,361,457

                             10. SHARED DISPOSITIVE POWER:

                                 488,241

11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

     1,361,457 common shares directly; 488,241 common shares indirectly

12.  CHECK IF THE  AGGREGATE  AMOUNT IN ROW (11)  EXCLUDES  CERTAIN  SHARES (SEE
     INSTRUCTIONS): /_/

13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):

     8.90% Common Stock directly and 3.19% indirectly

14.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

     IN

                                      -1-


ITEM 1. SECURITY AND ISSUER
---------------------------

The security for which this report is made is the common stock, par value $0.001
per share,  of T-Rex Oil, Inc. fka Rancher Energy Corp., a Colorado  corporation
(the "Issuer").

ITEM 2. IDENTITY AND BACKGROUND.
--------------------------------

This   statement   on  Schedule  13D  is  being  filed  on  behalf  of  Eckhardt
Huber-Flotho,  a citizen of Germany.  The address of  Eckhardt  Huber-Flotho  is
Josef-Raps - Str 2, Munchen, Germany D-80805.

ECKHARDT HUBER-FLOTHO, AGE 73

Mr. Huber-Flotho has experience with Real Estate,  Construction,  Investment and
Oil and Gas  business.  From 2005 through March 2015 he has was  Co-Founder  and
Director  of Western  Interior  Oil & Gas Corp.  Since  1987 he has had  various
responsibilities in financing and directing oil and gas companies.

Eckhardt  Huber-Flotho has not, during the last five years,  been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors).

Eckhardt  Huber-Flotho  has not,  during the last five years,  been a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
and as a result of such  proceeding  was or is subject to a judgment,  decree or
final  order  enjoining  future  violations  of,  or  prohibiting  or  mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

Eckhardt Huber-Flotho is a citizen of Germany.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
---------------------------------------------------------

Not Applicable.

ITEM 4. PURPOSE OF TRANSACTION
------------------------------

On March 28, 2015,  T-Rex Oil, Inc.  entered into a Share Exchange  Agreement by
and among T-Rex Oil, Inc., a Colorado  corporation,  and Western  Interior Oil &
Gas Corp. , a Wyoming corporation,  and the Shareholders of Western Interior Oil
& Gas Corp.

Under the  Agreement,  the Western  Interior Oil & Gas Corp.  common shares were
exchanged for common shares of T-Rex Oil, Inc. Eckhardt  Huber-Flotho  exchanged
1,361,457 shares of Western Interior Oil & Gas Corp. shares for 1,361,457 common
shares of T-Rex Oil, Inc. Mr. Huber-Flotho has indirect beneficial  ownership of
488,241 shares through his spouse.

As part of the Share Exchange Agreement, Mr. Huber-Flotho,  is to be appointed a
Director of T-Rex Oil, Inc.

Except as  otherwise  set  forth in this  Schedule  13D,  at  present,  Eckhardt
Huber-Flotho  does not have any  plans or  proposals  which  relate  to or would
result in any of the items for which  disclosure is required  pursuant to Item 4
of Schedule 13D.

Mr.  Huber-Flotho  may, at any time and from time to time,  review or reconsider
their  position  and/or change his purpose and/or  formulate  plans or proposals
with respect thereto.

                                      -2-



ITEM 5. INTEREST IN SECURITIES OF THE ISSUER
--------------------------------------------

The  percentages of outstanding  shares of T-Rex Oil, Inc. common stock reported
below are based on the statement that as of May 29, 2015,  there were 15,295,025
shares of T-Rex Oil, Inc. common stock outstanding.

     (a) Mr. Huber-Flotho beneficially owns or may be deemed to beneficially own
shares of T-Rex Oil, Inc. common stock as follows:

                                    No. of Shares            % of Class
                                    -----------------        -------------
         Common Shares                1,361,457                   8.90%
                                    -----------------        -------------
                                      1,361,457                   8.90%

                                    No. of Shares            % of Class
                                    -----------------        -------------
         Common Shares                  488,241 (1)               3.19%
           Indirect                 -----------------        -------------
                                        488,241 (1)               3.19%

--------------
(1)  Mr. Huber-Flotho holds indirect beneficial  ownership of the shares through
     his spouse.

     (b) For  information  regarding  the  number of shares of T-Rex  Oil,  Inc.
common stock as to which Eckhardt  Huber-Flotho holds or shares or may be deemed
to  hold,  reference  is made to  items  (7) - (12) of the  cover  page for this
statement on Schedule 13D.

     (c) Other  than as set forth  herein,  there have been no  transactions  in
shares of T-Rex Oil, Inc. common stock effected by Mr.  Huber-Flotho  during the
past 60 days.

     (d) No other  person  has the right to  receive  or the power to direct the
receipt of dividends from, or the proceeds from the sale of, such securities.

     (e) The date on which the  reporting  person  ceased to be the  beneficiary
owner of more than five percent of the class of securities: Not Applicable


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES OF THE ISSUER.
--------------------------------------------------------------------------------

Eckhardt  Huber-Flotho  has  no  contracts,   arrangements,   understandings  or
relationships  (legal or  otherwise)  with  other  persons  with  respect to the
securities  of T-Rex Oil,  Inc.,  other than as described  in this  statement on
Schedule 13D.


ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.
-----------------------------------------

10.1 - Share Exchange Agreement, dated March 28, 2015
10.2 - Amendment to Share Exchange Agreement, dated April 9, 2015



                                      -3-




                                   SIGNATURES

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


                                        Date: June 8, 2015



                                        /s/ Eckhardt Huber-Flotho
                                        ---------------------------------
                                        Eckhardt Huber-Flotho, Individual


































                                      -4-