NOTICE OF GUARANTEED DELIVERY
                                WITH RESPECT TO
                 SERIES B 12% SENIOR SECURED PIK NOTES DUE 2003
                    FOR ALL OUTSTANDING SERIES A 12% SENIOR
                           SECURED PIK NOTES DUE 2003
 
                                       OF
 
                               MENTUS MEDIA CORP.
 
               PURSUANT TO THE PROSPECTUS DATED           , 1998
 
    This form must be used by a holder of Series A 12% Senior Subordinated PIK
Notes due 2003 (the "Series A Notes") of Mentus Media Corp., a Delaware
corporation (the "Company"), who wishes to tender Series A Notes to the Exchange
Agent pursuant to the guaranteed delivery procedures described in "The Exchange
Offer--Guaranteed Delivery Procedures" of the Company's Prospectus, dated
          , 1998 (the "Prospectus") and in Instruction 2 to the related Letter
of Transmittal. Any holder who wishes to tender Series A Notes pursuant to such
guaranteed delivery procedures must ensure that the Exchange Agent receives this
Notice of Guaranteed Delivery prior to the Expiration Date of the Exchange
Offer. Capitalized terms used but not defined herein have the meanings ascribed
to them in the Prospectus or the Letter of Transmittal.
THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY
TIME, ON           , 1998 UNLESS EXTENDED (THE "EXPIRATION DATE").
 
                    United States Trust Company of New York
                            (the "Exchange Agent"):
 

                                            
          IF BY OVERNIGHT COURIER:                              IF BY HAND:
         United States Trust Company                    United States Trust Company
                 of New York                                    of New York
          770 Broadway, 13th Floor                             111 Broadway
             New York, NY 10003                                 Lower Level
       Attn: Corporate Trust Services                 Attn: Corporate Trust Services
                                                            New York, NY 10036

 
                                  IF BY MAIL:
                    United States Trust Company of New York
                                  P.O. Box 844
                         Attn: Corporate Trust Services
                                 Cooper Station
                            New York, NY 10276-0844
 
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE WILL
NOT CONSTITUTE A VALID DELIVERY.

    This form is not to be used to guarantee signatures. If a signature on a
Letter of Transmittal is required to be guaranteed by an "Eligible Institution"
under the instructions thereto, such signature guarantee must appear in the
applicable space provided in the signature box on the Letter of Transmittal.
 
Ladies and Gentlemen:
 
    The undersigned hereby tenders to the Company, upon the terms and subject to
the conditions set forth in the Prospectus and the related Letter of
Transmittal, receipt of which is hereby acknowledged, the principal amount of
Notes set forth below pursuant to the guaranteed delivery procedures set forth
in the Prospectus and in Instruction 2 of the Letter of Transmittal.
 
    The undersigned hereby tenders the Notes listed below:
 


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                                                              AGGREGATE
                                                              PRINCIPAL        AGGREGATE
       CERTIFICATE NUMBER(S) (IF KNOWN) OF NOTES OR             AMOUNT      PRINCIPAL AMOUNT
        ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY            REPRESENTED        TENDERED
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                            PLEASE SIGN AND COMPLETE
 

                                            
Signatures of Registered Holder(s) or          Date: , 1997
Authorized Signatory:
 
                                               Address:
 
Name(s) of Registered Holder(s):               Area Code and Telephone No.

 
    This Notice of Guaranteed Delivery must be signed by the Holder(s) exactly
as their name(s) appear on certificates for Series A Notes or on a security
position listing as the owner of Series A Notes, or by person(s) authorized to
become Holder(s) by endorsements and documents transmitted with this Notice of
Guaranteed Delivery. If signature is by a trustee, executor, administrator,
guardian, attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must provide the following information.
 
                      PLEASE PRINT NAME(S) AND ADDRESS(ES)
 
Name(s): _______________________________________________________________________
 
Capacity: ______________________________________________________________________
 
Address(es): ___________________________________________________________________
 
                                       2

                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, a firm which is a member of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.,
or is a commercial bank or trust company having an office or correspondent in
the United States, or is otherwise an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Securities Exchange Act of 1934, as
amended, guarantees deposit with the Exchange Agent of the Letter of Transmittal
(or facsimile thereof), together with the Series A Notes tendered hereby in
proper form for transfer (or confirmation of the book-entry transfer of such
Series A Notes into the Exchange Agent's account at the Book-Entry Transfer
Facility described in the Prospectus under the caption "The Exchange
Offer--Guaranteed Delivery Procedures" and in the Letter of Transmittal) and any
other required documents, all by 5:00 p.m., New York City time, on the fifth New
York Stock Exchange trading day following the Expiration Date.
 

                                                       
Name of firm                                                               (Authorized Signature)
Address                                                                             Name
                                                                               (Please Print)
                                                          Title
                   (Include Zip Code)
 
Area Code and Tel. No.                                    Dated , 1997

 
    DO NOT SEND SECURITIES WITH THIS FORM. ACTUAL SURRENDER OF SECURITIES MUST
BE MADE PURSUANT TO, AND BE ACCOMPANIED BY, AN EXECUTED LETTER OF TRANSMITTAL.
 
                                       3

                 INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY
 
    1.  DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY. A properly completed and
duly executed copy of this Notice of Guaranteed Delivery and any other documents
required by this Notice of Guaranteed Delivery must be received by the Exchange
Agent at its address set forth herein prior to the Expiration Date. The method
of delivery of this Notice of Guaranteed Delivery and any other required
documents to the Exchange Agent is at the election and sole risk of the holder,
and the delivery will be deemed made only when actually received by the Exchange
Agent. If delivery is by mail, registered mail with return receipt requested,
properly insured, is recommended. As an alternative to delivery by mail, the
holders may wish to consider using an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedures, see Instruction 2 of the
Letter of Transmittal.
 
    2.  SIGNATURES ON THIS NOTICE OF GUARANTEED DELIVERY. If this Notice of
Guaranteed Delivery is signed by the registered holder(s) of the Series A Notes
referred to herein, the signature must correspond with the name(s) written on
the face of the Series A Notes without alteration, enlargement, or any change
whatsoever. If this Notice of Guaranteed Delivery is signed by a participant of
the Book-Entry Transfer Facility whose name appears on a security position
listing as the owner of the Notes, the signature must correspond with the name
shown on the security position listing as the owner of the Notes.
 
    If this Notice of Guaranteed Delivery is signed by a person other than the
registered holder(s) of any Notes listed or a participant of the Book-Entry
Transfer Facility, this Notice of Guaranteed Delivery must be accompanied by
appropriate bond powers, signed as the name of the registered holder(s) appears
on the Notes or signed as the name of the participant shown on the Book-Entry
Transfer Facility's security position listing.
 
    If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing and submit with the Letter of Transmittal evidence
satisfactory to the Company of such person's authority to so act.
 
    3.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES. Questions and requests for
assistance and requests for additional copies of the Prospectus may be directed
to the Exchange Agent at the address specified herein. Holders may also contact
their broker, dealer, commercial bank, trust company, or other nominee for
assistance concerning the Exchange Offer.
 
                                       4