As filed with the Securities and Exchange Commission on February 23, 2004

                                                           Registration No. 333-
================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                    ________

                                    FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                    ________

                         ARROWHEAD RESEARCH CORPORATION
                 (Name of small business issuer in its charter)
        Delaware                                                 46-0408024
        --------                                                 ----------
 (State of incorporation)                                     (I.R.S. Employer
                                                             Identification No.)
                          150 S. Los Robles, Suite 480
                           Pasadena, California  91101
                                 (626) 792-5549
               (Address, including zip code, and telephone number,
        including area code, of Registrant's principal executive offices)

                           R. Bruce Stewart, President
                          150 S. Los Robles, Suite 480
                           Pasadena, California  91101
                                 (626) 792-5549
               (Address, including zip code, and telephone number,
                   including area code, of agent for service)

     APPROXIMATE  DATE  OF  COMMENCEMENT  OF PROPOSED SALE TO THE PUBLIC:   From
time  to  time  after  the  effective date of this Registration Statement as the
selling  security  holders  shall  determine.

     If  the  only  securities  being  registered on this form are being offered
pursuant  to dividend or interest reinvestment plans, please check the following
box. [ ]

     If any of the securities being registered on this form are to be offered on
a  delayed  or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment  plans,  check  the  following  box. [X]

     If  this  form  is  filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and  list  the  Securities  Act  registration  statement  number  of the earlier
effective  registration  statement  for  the  same  offering. [ ]

     If  this  form  is a post-effective amendment filed pursuant to Rule 462(c)
under  the  Securities  Act, check the following box and list the Securities Act
registration  statement  number  of the earlier effective registration statement
for  the  same  offering. [ ]

     If  delivery of the prospectus is expected to be made pursuant to Rule 434,
check  the  following  box. [ ]



                                    CACULATION OF REGISTRATION FEE

======================================================================================================
   Title of each                         Proposed maximum    Proposed maximum
 class of securities     Amount to be     offering price    aggregate offering         Amount of
  to be registered        registered         per unit              price         registration fee (1)
- ---------------------  ----------------  -----------------  -------------------  ---------------------
                                                                     
  Common Stock               13,063,350  $            4.25  $     55,519,238.00  $            7,034.29

  Warrants                   13,835,748               0.00                 0.00                    .00

  Common Stock (2)           13,835,748               1.50        20,753,622.00               2,629.48
                       ----------------                     -------------------  ---------------------

  Total                      40,734,846                     $     76,272,860.00  $            9,663.77
======================================================================================================
<FN>
(1)     Estimated  solely  for  the  purpose  of  computing  the  registration  fee.
(2)     Issuable upon exercise of the Warrants, and includes such additional shares of Common Stock as
        may be issuable pursuant to the adjustment provisions of the Warrants.


     THE  REGISTRANT  HEREBY  AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT THIS REGISTRATION
STATEMENT  SHALL  THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT  OF  1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY  DETERMINE.



                    SUBJECT TO COMPLETION, DATED FEBRUARY __, 2004

     The information in this Prospectus is not complete and may be changed.  The
selling  security  holders  may not sell these securities until the Registration
Statement  filed with the Securities and Exchange Commission is effective.  This
Prospectus  is not an offer to sell these securities and it is not soliciting an
offer  to  buy  these  securities  in  any  state where the offer or sale is not
permitted.

PROSPECTUS

                         ARROWHEAD RESEARCH CORPORATION

                        13,063,350 SHARES OF COMMON STOCK
                        WARRANTS TO PURCHASE COMMON STOCK
      13,835,748 SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF WARRANTS
                           __________________________

     This  Prospectus  covers  the sale of up to 13,063,350 shares of the Common
Stock, $.001 par value (the "Common Stock") of Arrowhead Research Corporation, a
Delaware corporation (the "Company"), by the selling security holders identified
in this Prospectus (the "Selling Security Holders"). This Prospectus also covers
the  sale  by  the  Selling  Security  Holders  of  Warrants  that currently are
exercisable  to purchase, at the price of $1.50 per share, up to an aggregate of
13,835,748  shares  of  Common Stock, and all of the 13,835,748 shares of Common
Stock  issuable  upon  exercise  of  the  Warrants.

     The  Company  will  not  receive  any proceeds from the sale by the Selling
Security  Holders  of  the Common Stock, Warrants, or Common Stock issuable upon
exercise  of  the  Warrants,  except  for  the $1.50 payable to the Company upon
exercise  of  the  Warrants.

     The  Company's  Common  Stock  is traded in the over-the-counter market and
quoted  on  the  OTC Bulletin Board under the symbol "ARWR."  On March __, 2004,
the  high  bid price for a share of Common Stock was $______,    Application has
been  made to have the Warrants approved for quotation on the OTC Bulletin Board
under  the  symbol  "ARWR-W."

     INVESTING  IN  THE COMPANY AND THE SECURITIES OFFERED HEREBY INVOLVES RISK,
SOME OF WHICH ARE DESCRIBED IN THE "RISK FACTORS" SECTION BEGINNING ON PAGE 4 OF
THIS  PROSPECTUS.

     NEITHER  THE  SECURITIES  AND  EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION  HAS  APPROVED  OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS  IS  TRUTHFUL  OR  COMPLETE.  ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL  OFFENSE.

                  The date of this Prospectus is March __, 2004



     YOU  SHOULD  RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. THE
COMPANY HAS NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION DIFFERENT FROM
THAT CONTAINED IN THIS PROSPECTUS.  THE SELLING SECURITY HOLDERS ARE OFFERING TO
SELL,  AND  SEEKING  OFFERS  TO  BUY,  SHARES  OF THE COMPANY'S COMMON STOCK AND
WARRANTS  ONLY  IN  JURISDICTIONS  WHERE  OFFERS  AND  SALES ARE PERMITTED.  THE
INFORMATION CONTAINED IN THIS PROSPECTUS IS ACCURATE ONLY AS OF THE DATE OF THIS
PROSPECTUS, REGARDLESS OF THE TIME OF DELIVERY OF THIS PROSPECTUS OR OF ANY SALE
OF  THE  COMMON  STOCK  OR  WARRANTS.


                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

     Summary . . . . . . . . . . . . . . . . . . . . . . . . . .             2
     Forward Looking Statements. . . . . . . . . . . . . . . . .             4
     Risk Factors. . . . . . . . . . . . . . . . . . . . . . . .             4
     Use of Proceeds . . . . . . . . . . . . . . . . . . . . . .             6
     Selling Security Holders. . . . . . . . . . . . . . . . . .             7
     Plan of Distribution. . . . . . . . . . . . . . . . . . . .             10
     Experts . . . . . . . . . . . . . . . . . . . . . . . . . .             11
     Where to Find Additional Information. . . . . . . . . . . .             11
     Information Incorporated by Reference . . . . . . . . . . .             11


                                     SUMMARY

     On  January  12,  2004,  the  Company, a Delaware corporation then known as
"InterActive Group, Inc.", acquired all of the issued and outstanding securities
of  Arrowhead  Research  Corporation,  a California corporation (the "California
corporation").  As  a  result  of  this  transaction, control of the Company was
changed,  with  the  former shareholders of the California corporation acquiring
approximately  88.9%  of  the  Company's  Common  Stock  outstanding immediately
following  the  transaction.  In  addition, all of the officers and directors of
the  Company  prior  to the transaction were replaced by designees of the former
shareholders of the California corporation, and the Company's corporate name was
changed  to  "Arrowhead  Research  Corporation."

     Consequently,  the  Company  currently  is engaged in continuing efforts to
finance  research in various aspects in the "nano-technology" field, with a view
toward realizing future revenue and profit from any such technologies that might
result  from  the  Company  sponsored  research.    Fortune Magazine has defined
nano-technology  as  "the  science  of  building  machines  and materials at the
molecular  level, where key components are measured in nanometers, one-billionth
of  a meter." Prospective applications include information technology, medicine,
manufacturing,  advanced  materials  and  environmental  control.  The  National
Science  Foundation  has  predicted  that  the  total market for nano-technology
products  and  services  will  approach  one  trillion dollars by the year 2015.

     To  date,  the  Company  has  entered into arrangements with the California
Institute  of  Technology  ("Caltech"),  and  two  individual  professors on the
faculty  of  Caltech,  with  respect  to  the  financing of research projects in
various  aspects  of  nano-technology  development.  In  consideration  of  the
financing  to  be  provided,  the  Company  has obtained the exclusive right and
license  to  commercially  exploit  any  technology developed as a result of the
research,  along  with


                                      -2-

any patents that are awarded to Caltech and the researchers. The Company is also
engaged  in  negotiations  with Caltech and members of its faculty pertaining to
additional  research  agreements

     The ultimate goal of Arrowhead in providing financing for research projects
such  as  those  described above is to obtain the rights to patentable and other
intellectual  property  that  can be used for commercial purposes. Should one or
more  of  the  projects  financed  by  the  Company result in the discovery of a
technology  having  commercial  application,  it is anticipated that the Company
would  either start a new company, as a majority-owned subsidiary, to pursue the
commercial  opportunity,  or  license  one  or  more  third  parties  to use the
technology  for commercial purposes, in exchange for the payment of royalties to
the  Company.

     As  is the case with any research project, there can be no assurance that a
commercially  viable technology will be developed as a result of any one or more
of the projects that the Company has agreed to finance to date or may finance in
the  future.  This  is  particularly  true  in the case of the projects that the
Company  typically  will  finance,  since most of these projects are in the very
early  stages of research, well before they have generated sufficient results to
attract the interest of traditional venture capital firms that focus in the high
tech  arena.  Consequently,  it  is anticipated that the Company will enter into
comparable  arrangements  with  a  number  of researchers in the nano-technology
field,  both at Caltech and at other universities.  In addition, the Company may
seek  to  identify  and finance the research and development activities of other
entrepreneurs  who  are  working  in  the  nano-technology  arena  outside  of a
university  setting.

     In  addition to financing the research activities of members of the Caltech
faculty,  the  Company  has  also  entered  into  another agreement with Caltech
pursuant  to  which  the Company has obtained the right to monitor and enforce a
large  portfolio  of  patents  that  have  previously  been issued to Caltech in
various  areas,  including  nano-technology.  Pursuant  to  this  agreement, the
Company has the right to retain 50% of any and all amounts that may be recovered
by  the Company from third parties who may be infringing upon one or more of the
patents  in  the  portfolio

     The  Company has also acquired certain technology from San Diego Magnetics,
Inc.  ("SDM").  SDM  was  formed  in 1998 to purchase from Eastman Kodak Company
("Kodak")  the assets and properties then employed by Kodak in the ownership and
activities  of  the  Kodak  San  Diego  Laboratories, a research and development
operation in San Diego, California involved in the areas of thin film, specialty
micro  and  nano devices and detectors.  In connection therewith, SDM obtained a
non-exclusive right and license to use, for research, development and commercial
purposes,  a  portfolio of patents owned by Kodak (the "Kodak Patents") that had
been developed by Kodak, through its Kodak San Diego Laboratories and otherwise.
In  addition, SDM acquired, or has subsequently developed, intellectual property
for  which patent protection has yet to be sought.  In August 2003, a portion of
the  intellectual  property  then  owned  by  SDM, relating to currency handling
products, was sold to a third party.  The rights of SDM in and under the balance
of  the  intellectual  property  that  was not sold to the third party (the "SDM
Technology")  were  acquired  by  the  Company  on  January  12,  2004.

     The Company is a Delaware corporation whose principal executive offices are
located  at  150  S.  Los Robles, Suite 480, Pasadena, California 91101, and its
telephone  number  is  (626)  792-5549.


                                      -3-

                           FORWARD LOOKING STATEMENTS

        Statements  contained in this Prospectus that are not purely historical,
are  forward-looking  statements  within  the  meaning  of  Section  27A  of the
Securities  Act  of 1933 and Section 21E of the Securities Exchange Act of 1934,
including  but  not  limited to statements regarding the Company's expectations,
hopes,  beliefs,  intentions  or strategies regarding the future. Actual results
could  differ  materially from those projected in any forward-looking statements
as  a  result of a number of factors, including those detailed in "Risk Factors"
below  and elsewhere in this Prospectus. The forward-looking statements are made
as  of  the  date  hereof,  and  the Company assumes no obligation to update the
forward-looking  statements,  or  to update the reasons why actual results could
differ  materially  from  those  projected  in  the  forward-looking statements.


                                  RISK FACTORS

     The  securities offered by this Prospectus involve a high degree of risk of
loss.  Prior  to  making  an  investment, prospective investors should carefully
read this entire Prospectus and the documents incorporated herein, and consider,
among  others,  the  following  risk  and  speculative  factors:

     UNPROVEN  PLAN OF OPERATIONS. As a consequence of the change in the control
of  the  Company on January 12, 2004, all efforts that were previously initiated
in  an  attempt  to develop a viable business plan have been abandoned. In place
thereof,  the  Company has adopted as a new plan of operations the strategy that
was  only  recently  formulated  by  the  California  corporation  following its
formation  in  May  2003.  To  date,  implementation  of  this strategy has been
limited,  with  only  two  research  projects  having been selected for funding.
Accordingly, the Company's business and operations should be considered to be in
the development stage, subject to all of the risks inherent in the establishment
of  new  business ventures. There can be no assurance that the intended business
and  operations  of  the Company will be successful. Any future success that the
Company might enjoy will depend upon many factors including factors which may be
beyond  the  control  of the Company, or which cannot be predicted at this time.
The  Company  may  encounter  unforeseen  difficulties  or  delays  in  the
implementation  of  its  plan of operations. There can be no assurance that such
difficulties  or  delays  will  not  have  a  material  adverse  effect upon the
financial  condition,  business  prospects and operations of the Company and the
value of an investment in the Company. The value of an investment in the Company
can  also  be  adversely  affected  by  a  number  of  external factors, such as
conditions  prevailing  in  the securities markets and/or the economy generally.
Consequently,  an  investment  in  the  Company  is  highly  speculative  and no
assurance  can be given that purchasers of the Company's securities will realize
any  return  on  their  investment or that purchasers will not lose their entire
investment.

     RISKS  INHERENT  IN  RESEARCH  PROJECTS.  As  is the case with any research
project, there can be no assurance that a commercially viable technology will be
developed  as  a  result of any one or more of the projects that the Company has
agreed  to  finance  to  date or may finance in the future. This is particularly
true  in  the  case of the projects that Arrowhead will typically finance, since
most of these projects are in the very early stage of research, well before they
have generated sufficient results to attract the interest of traditional venture
capital  firms  that  focus  in  the  high  tech  arena.


                                      -4-

     LACK  OF  REVENUE; NO ASSURANCE OF PROFITABILITY.  To date, the Company has
not  generated  any  revenue  as  a  result  of  its current plan of operations.
Moreover,  given  its  strategy  of  financing  new,  as yet unproved technology
research,  it  should be expected that the Company would not realize significant
revenue  in  the  foreseeable  future,  if  at  all.  For  this  reason,  it  is
anticipated that the Company will generate the funds needed to finance a growing
number  of research projects through future sales of securities, rather than out
of  profits  generated internally.  There can, however, be no assurance that the
Company  will  be  successful  in  the future in raising the level of additional
capital sought, or on terms currently contemplated, if at all.

     LIMITED  MARKET  FOR THE COMMON STOCK. The Company's Common Stock is traded
in  the  over-the-counter  market and quoted on the OTC Bulletin Board under the
symbol "ARWR." However, prior to the change in control of the Company on January
12, 2004, trading in the Common Stock was very sporadic. Since January 12, 2004,
there  have been extreme fluctuations in the price at which the Company's Common
Stock, which may be attributable, in large part, to the limited number of shares
of  Common  Stock available for public sale resulting from the 65-for-1 "reverse
split"  of  the  Common  Stock  on  January  12,  2004.  As a consequence of the
registration of the shares of Common Stock covered by this Prospectus for resale
under  the Securities Act of 1933, as amended (the "Securities Act"), the number
of  shares  of  the  Company's  Common Stock in the public "float" will increase
dramatically.  Sales  of  a number of the shares of Common Stock covered by this
Prospectus,  or  even  the  possibility  of such sales, could have a significant
effect on the market price for a share of the Company's Common Stock.

     NO  PRIOR  MARKET  FOR  THE  WARRANTS.  All of the Warrants covered by this
Prospectus  were  issued  without  registration  under  the  Securities Act, and
therefore  have been "restricted securities" which could not publicly be resold.
As  a  consequence  of  the  registration  of  the Warrants for resale under the
Securities  Act,  a  public market for the Warrants may develop. The Company has
filed  for  the registration of the entire class of Warrants under Section 12(g)
of  the  Securities Exchange Act of 1934, as amended, and the Warrants have been
approved  for  quotation  on  the  OTC Bulletin Board under the symbol "ARWR-W."
There can be no assurance, however, that an active public trading market for the
Warrants will develop or be sustained in the near future, if at all.

     ARBITRARY  DETERMINATION  OF WARRANT EXERCISE PRICE. The price at which the
Warrants  may  be  exercised  to purchase shares of Common Stock was arbitrarily
determined  by  the  Company alone, and bears no relationship to earnings, asset
values,  book  value  or  any other recognized criteria of value. No independent
third party, such as an investment banking firm or other expert in the valuation
of businesses or securities, has made an evaluation of the economic potential of
the Company or the value of a share of the Company's Common Stock.

     POSSIBLE  VOLATILITY  OF  MARKET  PRICES.  The over-the-counter markets for
securities  such  as  the  Company's Common Stock and Warrants historically have
experienced  extreme price and volume fluctuations during recent periods.  These
broad market fluctuations, and other factors such as general economic conditions
and  trends  in the investment markets, may adversely affect the market price of
the  Company's Common Stock and Warrants for reasons unrelated to the Company or
its  operating  performance.

     SALES  OF  ADDITIONAL  SECURITIES.  The  Company  is authorized to issue an
aggregate of 50,000,000 shares of Common Stock without approval of the Company's
stockholders,  on such terms and at such prices as the Board of Directors of the
Company  may  determine.  Of  these shares, an aggregate of 13,552,599 shares of
Common  Stock  have  been  issued,  13,835,748  are  reserved  for issuance upon
exercise  of  outstanding  stock  purchase  warrants,  and  225,000  shares


                                      -5-

of  Common  Stock  are reserved for issuance upon exercise of stock options that
may  be  granted  by the Board of Directors to employees, consultants and others
expected  to  provide  significant services to the Company. More than 22,000,000
shares  of  Common  Stock  remain available for issuance by the Company to raise
additional  capital,  in connection with prospective acquisitions, upon exercise
of  future  stock  option  grants, or for other corporate purposes. Issuances of
additional  shares  of  Common  Stock would result in dilution of the percentage
interest  in  the  Company's Common Stock of all stockholders ratably, and might
result  in  dilution  in the tangible net book value of a share of the Company's
Common  Stock,  depending upon the price and other terms on which the additional
shares  are  issued.  In  addition,  the issuance of additional shares of Common
Stock  upon exercise of the Warrants, or even the prospect of such issuance, may
be  expected  to have an effect on the market for the Common Stock, and may have
an adverse impact on the price at which shares of Common Stock trade.

     REDEEMABLE  WARRANTS.  The  Warrants  may be redeemed by the Company at any
time  following  issuance,  upon  30  day's  prior written notice to the holders
thereof, provided that a public market for the underlying shares of Common Stock
then  exists and the closing bid price for a share of the Company's Common Stock
for  20  consecutive trading days ending not more than 15 days prior to the date
of  the  redemption notice equals or exceeds $3.00 per share.  Redemption of the
Warrants  could  force the holders to exercise the Warrants and pay the exercise
price  at  a  time when it might be disadvantageous for the holders to do so, to
sell  the Warrants when they might otherwise wish to hold them, or to accept the
redemption  price,  which may be substantially less than the market value of the
Warrants  at the time of redemption.  Warrant holders who fail to exercise their
Warrants  will  experience  a  corresponding  decrease  in their interest in the
Company  relative  to  the  ownership  interest  of those Warrant holders who do
exercise  their  Warrants.

     POSSIBLE  ISSUANCE OF PREFERRED STOCK.  Although the Company has no present
plan  to issue any shares of Preferred Stock, the issuance of Preferred Stock in
the future could provide voting or conversion rights that would adversely affect
the  voting  power  or  other  rights of the holders of Common Stock and thereby
reduce  the  value  of  the Common Stock. In addition, the issuance of Preferred
Stock  may  have  the  effect  of  delaying, deferring or preventing a change in
control  of  the  Company.  In  particular,  specific  rights  granted to future
holders  of  Preferred  Stock could be used to restrict the Company's ability to
merge  with  or sell its assets to a third party, or otherwise delay, discourage
or  prevent  a  change  in  control  of  the  Company.

     NO DIVIDENDS. The Company does not anticipate that it will pay dividends in
the  foreseeable  future.  Instead, the Company intends to apply any earnings to
the  development  and  expansion  of  its  business.


                                 USE OF PROCEEDS

     The  Company  will  not  receive  any proceeds from any sales of the Common
Stock  or  Warrants  covered  by this Prospectus. All proceeds from sales of the
Common  Stock  and Warrant will go to the Selling Security Holder who offers and
sells  the  Common Stock and/or Warrants, as the case may be.  The Company will,
however,  receive  the $1.50 exercise price payable to the Company upon exercise
of  the  Warrants, which will be added to the capital of the Company and used in
the  implementation  of  its  plan  of  operations.


                                      -6-

                            SELLING SECURITY HOLDERS

     The  registration statement of which this Prospectus is a part was filed by
the  Company  for the purpose of registering for resale under the Securities Act
all  of  the  securities  that  were  issued in connection with the transactions
contemplated  by  the  Stock  Purchase and Exchange Agreement dated December 10,
2003  (the "Exchange Agreement"), which resulted in the change in control of the
Company  that  occurred  on January 12, 2004.  In accordance with a Registration
Rights  Agreement  executed  by  the Company pursuant to the Exchange Agreement,
each recipient of Common Stock and/or Warrants in connection with a transactions
specified  in the Exchange Agreement (individually, a "Selling Security Holder",
and  collectively,  the  "Selling  Security Holders") is entitled to have all of
their  Common  Stock and Warrants registered by the Company for resale under the
Securities  Act.

     The  following  table  sets forth the name of each Selling Security Holder,
along  with  the  number  of  shares of the Company's Common Stock owned by each
Selling Security Holder as of February __, 2004, and the number of shares of the
Company's  Common  Stock  issuable upon exercise of Warrants owned by each as of
February  __,  2004.  The  information  in  the table below with respect to each
Selling  Security  Holder was obtained by the Company from that Security Holder,
and  is  current  as of the date of this Prospectus. All of the Common Stock and
Warrants owned by each Selling Security Holder, along with all of the additional
shares  of Common Stock issuable upon exercise of Warrants, are being registered
to  permit public secondary trading of thereof, and the Selling Security Holders
may  offer all of the Common Stock, the Warrants, and the shares of Common Stock
issuable  upon  exercise  of  the  Warrants,  for  resale  from  time to time as
described  below.



                                                                        Shares of Common Stock
                                                    Shares of         issuable upon exercise of
       Name                                        Common Stock         outstanding Warrants
- ------------------------                           ------------         --------------------
                                                                

Colman Abbe                                                   16,667                     16,667
Richard Abbe                                                  33,334                     33,334
Michael Abbott                                                35,000                     35,000
AFI, LLP                                                      25,000                     25,000
Ivano Agelastri                                               62,500                     32,500
Thomas B. Akin                                               100,000                    100,000
Jack M. Armstrong, IRA                                        16,667                     16,667
Milton Aronowitz, Jr.                                         62,500                     62,500
Craig S.Atkins III                                           166,667                    166,667
Sam Belzberg                                                 133,333                    133,333
Doug & Zinita Benson                                         150,000                    150,000
F. Berdon Co. LP                                              40,000                     40,000
Elizabeth Berman                                              16,667                     16,667
Colbart Birnett                                               34,000                     34,000
Bluestem Capital Company                                          --                     34,533
Melinda & Steve Boyd                                         110,000                    110,000
Timothy J. Brothers                                           12,500                     12,500
Karen Brunner-Steirer                                         25,000                     25,000
Paul Burkhard                                                 25,000                     25,000
California Institute of Technology                           150,000                         --
Canterbury Consulting Inc. 401K Plan                          10,000                     10,000
Central Park International Corp                               25,000                     25,000
Dr. Henry & Marc Chalfin                                      16,000                     16,000


                                      -7-

Philip J. Chelsvig                                            33,000                     33,000
Robert Ching MD                                            2,204,487                  2,204,487
Scott Cohen                                                   50,000                     50,000
Congregation Darkei Tshivo of Dinon Inc.                      50,000                     50.000
Virginia Dadley                                              102,500                    102,500
Philip & Judy Dameshek                                       466,667                    466,667
Patsy Z. Dewey                                                75,000                     75,000
The Dorsey Family Trust                                      100,000                    100,000
Drake Revocable Trust                                        500,167                    416,667
Dunedin, Inc.                                                     --                      2,500
Eduard Maurice Erni                                           25,000                     25,000
Richard & Anne Ferrero                                        60,000                     60,000
Fred F. Finocchiaro                                          133,863                    158,863
John Rocky Finocchiaro                                        33,000                     33,000
Carol Flickinger                                                  --                      2,250
William Forkner                                               12,500                      5,000
Edward Frykman  (1)                                           50,000                     50,000
Carl Fuller, IRA                                               6,667                      6,667
Alan Gelband                                                  50,000                     50,000
Arie S. Goldman                                               18,000                     18,000
Henry Gurley III                                              29,703                     29,703
Dean Hadley                                                   25,000                     25,000
Dean Hall                                                     25,000                     25,000
William J. Hanson  (2)                                       114,912                    242,329
Hauck & Aufhauser Banquiers Luxembourg S.A.                  100,000                    100,000
Heller Family Foundation                                      50,000                     50,000
Stephen Hess                                                  25,000                     25,000
Iroquois Capital L.P.                                         50,000                     50,000
James Irvine                                                  33,333                     33,333
Michael Kahan                                                 25,000                     25,000
Andreas Kappler                                               25,000                     25,000
Harry and Matye Kilpatrick                                    25,000                     25,000
Mary Jane Kirkland                                            10,000                     10,000
Jeffrey P. Knightly                                           25,000                     25,000
Kreuzfeld Ltd                                              1,250,000                  1,100,000
David M. Lackey                                              300,000                    875,615
John T. Lackey                                               250,000                    250,000
Robert J. and Karin A Lancellotti                             15,000                     15,000
Calvin Layland                                                50,000                     50,000
Aryid Lokensgard                                              10,000                     10,000
Richard Love                                                  33,947                    145,218
Jonathan Manela                                               16,667                     16,667
Gustavo A. Martinez  and Irma Rosas Simbeck                   20,000                     20,000
Kathleen Maclean                                              33,333                     33,333
Andeas Meixger                                                15,000                     15,000
Midwest Investments Services, LLC                             46,667                     46,667
Philip W. Mirebelli                                           25,000                     25,000
William M. Moon, DDS                                          33,333                     33,333
Dominic F. Mortellaro                                         30,000                     30,000
R Verena Mumford-Wolfensberger                                35,000                     35,000
Randall Myers                                                 33,000                     33,000
NAV I Fund LP                                                 33,333                     33,333
NAV Capital Mgmt NAV Fund I, Ltd.                             16,667                     16,667
Barry Neville                                                 20,000                     20,000
Edward Newman                                                 33,333                     33,333


                                      -8-

Larry Noble IRA                                               23,300                     23,300
Michi O                                                       25,000                     27,250
Dean J. O'Conner                                              12,730                     12,730
Penfield Partners LP                                         200,000                    200,000
James M. Phillips, Jr.  (3)                                  150,000                    250,000
Russ Pohl                                                      2,000                      2,000
PTJP Partners                                                100,000                    100,000
Jeffrey O. Putterman                                         100,000                    100,000
Premium Strategy Partners, AG                                200,000                      5,000
Arthur & Selma Rabin                                         333,333                    333,333
Donald L. Richey, MD                                          25,000                     25,000
Nicolas Rogivue                                              550,000                    550,000
Romano Ltd.                                                   33,333                     33,333
San Diego Magnetics, Inc                                          --                     25,000
Martin Schlatter                                              25,000                     25,000
John Schneller                                                25,000                     25,000
S & I Consulting                                                  --                      2,500
SDS Capital Group SPC, Ltd.                                  166,667                    166,667
Janet L. Segal Revocable Trust                                25,000                     25,000
Carl D. and Margaret L. Selkirk                               25,000                     25,000
Hardip K. and Paul Sethi                                      17,000                     17,000
Frederick L. Simmons                                          35,000                     35,000
Smithfield Fiduciary LLC                                     333,333                    333,333
Lauren J. Soloman                                            100,000                    100,000
Russel D. Soloman                                             25,000                     25,000
Kenneth H. South                                              75,000                     75,000
Robert Stahl (4)                                               2,000                      8,250
Robert A. Stein                                               50,000                     50,000
R. Bruce Stewart  (5)                                        471,500                    240,000
Robert B. Stewart                                            420,000                    704,533
Thomas C. Stewart                                            310,000                    510,000
Irene Tanner                                                  25,000                     25,000
Michael Tauss                                                 37,500                      7,500
Taylor Family Trust                                          100,000                    100,000
Sheldon S. Traube                                                 --                     19,000
Torrey Pines Research                                         45,965                    112,197
TPR Group, Inc.                                                19509                     84,806
Bennett Harry Tremaine  IRA                                   50,000                     50,000
Bret L. Undem                                                 20,000                     20,000
V&L Ventures, Inc.                                            25,000                     25,000
Vertical Ventures, LLC                                       372,933                    372,933
West Bay Investments, LLC                                     22,000                     22,000
Aaron Wolfson                                                 61,000                     61,000
Abraham Wolfson                                               34,000                     34,000
Morris Wolfson                                                50,000                     50,000
Wolfson Equities                                             240,333                    240,333
_______________________________
<FN>

(1)  Mr. Frykman is a director of the Company.
(2)  Mr. Hanson was a director and Vice President of the Company until the change in control of the
     Company that occurred on January 12, 2004.
(3)  Mr. Phillips is a director and Secretary of the Company.
(4)  Mr. Stahl was the President of the Company until the change in control of the Company that
     occurred on January 12, 2004.
(5)  Mr. Stewart is a director and the President of the Company.



                                      -9-

                              PLAN OF DISTRIBUTION

     The Common Stock and Warrants offered by this Prospectus may be sold by the
Selling Security Holders or by their respective pledgees, donees, transferees or
other successors in interest. Such sales may be made at fixed prices that may be
changed,  at  market prices prevailing at the time of sale, at prices related to
such  prevailing  market prices, or at negotiated prices, and may be made in the
over-the-counter  market  or  any  exchange  on  which  the  Common Stock and/or
Warrants  stock may then be listed. The Common Stock and Warrants may be sold in
one  or  more  of  the  following  kinds  of  transactions:

     -    one  or  more block trades in which a broker or dealer so engaged will
          attempt  to  sell all or a portion of the Common Stock and/or Warrants
          held  by the Selling Security Holder as an agent, but may position and
          resell  a  portion  of  the  block  as  principal  to  facilitate  the
          transaction;

     -    a  purchase  by  a broker or dealer as a principal, for resale by such
          broker  or dealer as principal and resale by such broker or dealer for
          its  account  under  this  Prospectus;

     -    ordinary  brokerage  transactions and transactions in which the broker
          solicits  purchasers;  and

     -    privately  negotiated transactions between the Selling Security Holder
          and  purchasers  without  a  broker-dealer.

     The Selling Security Holders may effect such transactions by selling Common
Stock and/or Warrants to or through broker dealers, and such broker-dealers will
receive  compensation  in  negotiated  amounts  in  the  form  of  discounts,
concessions,  commissions  or  fees from the Selling Security Holders and/or the
purchasers  of the Common Stock and/or Warrants for whom such broker-dealers may
act as agent or to whom they sell as principal, or both (which compensation to a
particular  broker-dealer  might  be  in  excess of customary commissions). Such
brokers  or  dealers  or  other participating brokers or dealers and the Selling
Security  Holders  may  be deemed to be "underwriters" within the meaning of the
Securities  Act,  in  connection  with  such sales. Except for customary selling
commissions  in  ordinary  brokerage transactions, any such underwriter or agent
will be identified, and any compensation paid to such persons will be described,
in  a  supplement to this Prospectus In addition, any securities covered by this
Prospectus  that  qualify  for  sale under Rule 144 might be sold under Rule 144
rather  than  under  this  Prospectus.

     Each  Selling  Security  Holder  will bear all expenses with respect to the
offering of Common Stock and/or Warrants by such Selling Security Holder, except
that the Company will pay the costs associated with registering the Common Stock
and  Warrants  under  the  Securities  Act  and  preparing  this  Prospectus.


                                      -10-

                                     EXPERTS

     The  financial statements of Arrowhead Research Corporation incorporated in
this  Prospectus  by reference to the Company's Annual Report on Form 10-KSB for
the  year ended September 31, 2003, have been so incorporated in reliance on the
report  of  Kevin  G.  Breard,  CPA,  An  Accountancy  Corporation, given on the
authority  of  said  firm  as  experts  in  auditing  and  accounting.


                      WHERE TO FIND ADDITIONAL INFORMATION

     The  Company  files annual, quarterly and special reports, proxy statements
and  other  information  with  the  Securities  and  Exchange  Commission  (the
"Commission").  You  may  read and copy any document filed by the Company at the
Commission's  Public  Reference Room at 450 Fifth Street, N.W., Washington, D.C.
20549.  Please  call the Commission at 1-800-SEC-0330 for further information on
the  public  reference  room. The Company's filings with the Commission are also
available  to  the  public  at  the  Commission's  internet  web  site:
http://www.sec.gov.  You may also read and copy this information at the National
Association  of  Securities Dealers, Inc., 1735 K Street, N.W., Washington, D.C.
20006.

     The Company has filed a registration statement, of which this Prospectus is
a  part, covering the securities offered hereby. As allowed by Commission rules,
this  Prospectus  does  not  include  all  of  the  information contained in the
registration  statement  and  the  included  exhibits,  financial statements and
schedules.  You  are  referred  to  the  registration  statement,  the  included
exhibits,  financial  statements  and  schedules  for  further information. This
Prospectus  is  qualified  in  its  entirety  by  such  other  information


                      INFORMATION INCORPORATED BY REFERENCE

     The  Commission  allows  the  Company  to  "incorporate  by  reference" the
information  that  is filed by the Company with the Commission, which means that
the  Company can disclose important information to you by referring you to those
documents.  The information incorporated by reference is considered to be a part
of  this  Prospectus,  and  later  information  that  the Company files with the
Commission  will  automatically  update  and  supersede  this  information. This
Prospectus  incorporates by reference the documents listed below, and any future
filings made with the Commission under Sections 13(a), 13(c), 14 or 15(d) of the
Securities  Exchange  Act  of  1934, as amended, (the "Exchange Act"), until the
Selling  Security  Holders  sell  all  of  the Common Stock and Warrants offered
herein.  The  documents  incorporated  by  reference  are:

     1.     The Company's Annual Report on Form 10-KSB for the fiscal year ended
September 30, 2003, filed on January 13, 2004;

     2.     The Company's Quarterly Report on Form 10-QSB for the fiscal quarter
ended December 31, 2003, filed on February 13, 2004;

     3.     The  description  of  the  Common  Stock  contained in the Company's
Information Statement on Schedule 14-C, filed on January 19, 2001;


                                      -11-

     4.     The  description  of  the  Warrants  contained  in  the  Company's
Registration Statement on Form 8-A, filed on February 20, 2004; and

     5.     All  documents  filed  by  the  Company  pursuant to Sections 13(a),
13(c),  14  and  15(d)  of the Exchange Act, after the date of this Registration
Statement  and  prior  to  the  filing  of  a  post-effective  amendment to this
registration  statement  of  which this Prospectus is a part that indicates that
all  securities  offered  hereunder  have  been  sold,  or which deregisters all
securities  then  remaining  unsold  under such registration statement, shall be
deemed to be incorporated by reference in the registration statement and to be a
part hereof from the date of filing of such documents.

     The  Company  will  provide,  without charge, to each person, including any
beneficial  owner,  to  whom  a  copy of this Prospectus is delivered, upon such
person's  written  or  oral  request,  a  copy of any and all of the information
incorporated  by  reference  in  this  Prospectus,  other  than exhibits to such
documents,  unless such exhibits are specifically incorporated by reference into
the  information  that this Prospectus incorporates. Requests should be directed
to  the  Secretary  at Arrowhead Research Corporation, 150 S. Los Robles Avenue,
Suite 480, Pasadena, California 91101; telephone: (626) 792-5549.



                                      -12-



                         13,063,350 SHARES OF COMMON STOCK

                        WARRANTS TO PURCHASE COMMON STOCK

      13,835,748 SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF WARRANTS






                         ARROWHEAD RESEARCH CORPORATION


                        _________________________________

                                   PROSPECTUS
                          _____________________________






                                 March __, 2004





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM  14.  OTHER  EXPENSES  OF  ISSUANCE  AND  DISTRIBUTION.

     The  following  table  sets  forth  the  costs and expenses, payable by the
Company  in  connection  with  the registration and sale of the Common Stock and
Warrants being registered. All amounts are estimates except the SEC registration
fee.



                                                         Amount to be paid
                                                         ------------------
                                                      

     SEC registration fee . . . . . . . . . . . . . .    $
     Printing expenses. . . . . . . . . . . . . . . .                 2,500
     Accounting fees and expenses . . . . . . . . . .                 2,000
     Miscellaneous. . . . . . . . . . . . . . . . . .                   500
                                                         ------------------
                     Total. . . . . . . . . . . . . .    $            5,000
                                                         ==================



ITEM  15.  INDEMNIFICATION  OF  DIRECTORS  AND  OFFICERS.

     The  Company's Certificate of Incorporation provides for the elimination of
personal monetary liability of directors to the fullest extent permissible under
Delaware  law.  Delaware  law  does  not permit the elimination or limitation of
director  monetary liability for: (i) breaches of the director's duty of loyalty
to the corporation or its stockholders; (ii) acts or omissions not in good faith
or  involving  intentional  misconduct  or  knowing violations of law; (iii) the
payment  of  unlawful  dividends or unlawful stock repurchases or redemptions or
(iv)  transactions  in which the director received an improper personal benefit.

     Section  145  of  the  Delaware  General Corporation Law permits a Delaware
corporation to indemnify, on certain terms and conditions, any person who was or
is  a  party  or  is  threatened to be made a party to any threatened pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative,  by  reason  of  the  fact that he is or was a director, officer,
employee  or agent of the corporation or is or was serving at the request of the
corporation  as  a  director, officer, employee or agent of another corporation,
partnership,  joint  venture,  trust  or  other  enterprise  against  expenses
(including  attorneys'  fees),  judgments,  fines and amounts paid in settlement
actually  and  reasonably  incurred  by  him in connection with such action. The
Certificate  of  Incorporation  and Bylaws of the Company require the Company to
indemnify  the  Company's directors and officers to the fullest extent permitted
under  Delaware  law.

     Insofar as indemnification for liabilities arising under the Securities Act
of  1933  (the  "Act")  may  be permitted to directors, officers and controlling
persons  of  the  Company  pursuant to the foregoing provisions, the Company has
been  advised that in the opinion of the Securities and Exchange Commission such
indemnification  is  against  public  policy  as  expressed  in  the Act and is,
therefore,  unenforceable.


                                      II-1

ITEM 16. EXHIBITS.

      Exhibit  No.                    Description
      -----------                     -----------

          2.1       Stock  Purchase  and  Exchange  Agreement dated December 10,
                    2003,  by  and among InterActive Group, Inc. and the several
                    stock and warrant holders of Arrowhead Research Corporation,
                    a  California  corporation.  (1)

          4.1       Registration  Rights  Agreement  dated  January 12, 2004 (1)

          4.2       Standstill  and  Registration Rights Agreement dated January
                    12,  2004  (1)

          4.3       Form  of  Warrant  (2)

          5.1       Opinion  of  James  M.  Phillips,  Jr.

          23.1      Consent  of Kevin G. Breard, CPA, An Accountancy Corporation

          24.1      Power  of  Attorney  (contained  on  page  II-4  of  this
                    registration  statement)
          _____________________

          (1)  Incorporated  by  reference  from  the  exhibits to the Company's
               Annual  Report on Form 10-KSB for the fiscal year ended September
               30, 2003, filed on January 13, 2004.

          (2)  Incorporated  by  reference  from  the  exhibits  to  the Company
               Registration Statement on Form 8-A, filed on February 23, 2004.


ITEM 17. UNDERTAKINGS.

     The Company hereby undertakes:

     (a)  Rule  415  Offering.

          (1)  To  file,  during  any  period in which offers or sales are being
made,  a  post-effective amendment to this Registration Statement to include any
material  information  with  respect  to the plan of distribution not previously
disclosed  in  the  Registration  Statement  or  any  material  change  to  such
information  in  the  Registration  Statement;

          (2)  That,  for  the  purpose  of  determining any liability under the
Securities  Act,  each  post-effective  amendment  shall  be  deemed to be a new
registration  statement  relating  to  the  securities  offered therein, and the
offering  of such securities at that time shall be deemed to be the initial bona
fide  offering  thereof.

          (3)  To  remove  from  registration  by  means  of  a  post-effective
amendment  any  of  the  securities  being registered which remain unsold at the
termination  of  the  offering.


                                      II-2

     (e)  Request  for  Acceleration  of  Effective  Date.

          Insofar  as  indemnification  for  liabilities  arising  under  the
Securities  Act  may be permitted to directors, officers and controlling persons
of  the  registrant  pursuant  to  the  foregoing  provisions, or otherwise, the
Company  has been advised that in the opinion of the SEC such indemnification is
against  public  policy  as  expressed  in the Securities Act and is, therefore,
unenforceable.

          In the event that a claim for indemnification against such liabilities
(other  than  the  payment  by  the  Company  of  expenses incurred or paid by a
director,  officer  or  controlling  person  of the registrant in the successful
defense of any action, suit or proceeding) is asserted by such director, officer
or  controlling  person  in connection with the securities being registered, the
Company  will,  unless in the opinion of its counsel the matter has been settled
by  controlling  precedent,  submit  to  a court of appropriate jurisdiction the
question  whether  such  indemnification  by  it  is  against  public  policy as
expressed  in  the Securities Act and will be governed by the final adjudication
of  such  issue.


                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Company certifies that it has reasonable grounds to believe that it meets all of
the  requirements  for  filing on Form S-3 and has duly caused this Registration
Statement  to  be  signed  on  its  behalf  by  the  undersigned, thereunto duly
authorized,  in the City of Pasadena, State of California, on February 23, 2004.

                                    ARROWHEAD RESEARCH CORPORATION



                                  By:  /s/  R. Bruce Stewart
                                       -----------------------------------
                                       R. Bruce Stewart, President




                                      II-3

                                POWER OF ATTORNEY

     Each person whose signature appears below constitutes and appoints R. Bruce
Stewart  and James M. Phillips, Jr. his or her true and lawful attorneys-in-fact
and  agents,  each  acting  alone,  with  full  power  of  substitution  and
resubstitution,  for  him or her and in his or her name, place and stead, in any
and  all  capacities,  to  sign  any or all amendments (including post-effective
amendments)  to  the  Registration  Statement,  and  to  sign  any  registration
statement  for  the same offering covered by this Registration Statement that is
to  be effective upon filing pursuant to Rule 462(b) under the Securities Act of
1933,  as  amended,  and  all post-effective amendments thereto, and to file the
same, with all exhibits thereto, and all documents in connection therewith, with
the Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents,  full power and authority to do and perform each and every act and thing
requisite  and  necessary  to be done in and about the premises, as fully to all
intents  and purposes as he or she might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact and agents, each acting alone, or
his  substitute  or  substitutes,  may lawfully do or cause to be done by virtue
hereof.

     Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  on Form S-3 has been signed by the following persons in
the  capacities  and  on  the  dates  indicated.

    Signature                           Office(s)                    Date
    ---------                           ---------                    ----

/s/ R. Bruce Stewart        President (principal executive,    February 23, 2004
- --------------------------  financial and accounting officer)
R. Bruce Stewart            and Director

/s/ Edward W. Frykman       Director                           February 23, 2004
- --------------------------
Edward W. Frykman


/s/ James M. Phillips, Jr.  Director                           February 23, 2004
- --------------------------
James M. Phillips, Jr.


/s/ LeRoy T. Rahn           Director                           February 23, 2004
- --------------------------
LeRoy T. Rahn


/s/ Charles Patrick Collier Director                           February 23, 2004
- --------------------------
Charles Patrick Collier


/s/ Marc W. Bockrath        Director                           February 23, 2004
- --------------------------
Marc W. Bockrath



                                      II-4

                                  EXHIBIT INDEX

       Exhibit  No.                         Description
       -----------                          -----------

          2.1       Stock  Purchase  and  Exchange  Agreement dated December 10,
                    2003,  by  and among InterActive Group, Inc. and the several
                    stock and warrant holders of Arrowhead Research Corporation,
                    a  California  corporation.  (1)

          4.1       Registration  Rights  Agreement  dated  January 12, 2004 (1)

          4.2       Standstill  and  Registration Rights Agreement dated January
                    12,  2004  (1)

          4.3       Form  of  Warrant  (2)

          5.1       Opinion  of  James  M.  Phillips,  Jr.  *

          23.1      Consent of Kevin G. Breard, CPA, An Accountancy Corporation*

          24.1      Power  of  Attorney  (contained  on  page  II-4  of  this
                    registration  statement)
          _____________________

          *    Filed  herewith.

          (1)  Incorporated  by  reference  from  the  exhibits to the Company's
               Annual  Report on Form 10-KSB for the fiscal year ended September
               30,  2003,  filed  on  January  13,  2004.

          (2)  Incorporated  by  reference  from  the  exhibits  to  the Company
               Registration  Statement  on Form 8-A, filed on February 23, 2004.




                                      II-5