SULLIVAN & WORCESTER LLP
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                                            January 31, 2006



Met Investors Series Trust
5 Park Plaza
Suite 1900
Irvine, California  92614

Gentlemen:

         We have acted as counsel for Met Investors Series Trust (the "Trust")
in connection with the offer by the Trust of an unlimited number of shares of
beneficial interest of the Trust (the "Shares") which are currently classified
as forty-six series (each a "Portfolio" and together, the "Portfolios"). We have
participated in the preparation of Post-Effective Amendment No. 22 to the
Trust's Registration Statement (the "Registration Statement") on Form N-1A
relating to the Shares of the Met/AIM Capital Appreciation Portfolio,
Batterymarch Growth and Income Portfolio, Batterymarch Mid-Cap Stock Portfolio,
Federated High Yield Portfolio, Loomis Sayles Global Markets Portfolio;
Princeton Large-Cap Core Portfolio, MFS Emerging Markets Equity Portfolio, MFS
Value Portfolio, Pioneer Fund Portfolio, Pioneer Strategic Income Portfolio,
Pioneer Mid-Cap Value Portfolio, Dreman Small-Cap Value Portfolio, Janus Capital
Appreciation Portfolio and Legg Mason Partners Managed Assets Portfolio of the
Trust to be filed with the Securities and Exchange Commission under the
Securities Act of 1933, as amended ("1933 Act"), on or about January 31, 2006.

         In so acting, we have participated in the preparation of the Agreement
and Declaration of Trust of the Trust, dated July 27, 2000 (the "Declaration of
Trust"). We have also examined and relied upon the originals, or copies
certified or otherwise identified to our satisfaction, of such records,
documents, certificates and other instruments, and have made such other
investigations, as in our judgment are necessary or appropriate to enable us to
render the opinions expressed below.

         We are admitted to the Bars of The Commonwealth of Massachusetts and
the District of Columbia and generally do not purport to be familiar with the
laws of the State of Delaware. To the extent that the conclusions based on the
laws of the State of Delaware are involved in the opinions set forth herein
below, we have relied, in rendering such opinions, upon our examination of
Chapter 38 of Title 12 of the Delaware Code Annotated, as amended, entitled
"Treatment of Delaware Business Trusts" (the "Delaware business trust law") and
on our knowledge of interpretation of analogous common law of The Commonwealth
of Massachusetts.

         This letter expresses our opinion as to the provisions of the Trust's
Declaration of Trust, but does not extend to the Delaware Uniform Securities
Act, or to other federal or state securities laws or other federal laws.

         Based upon the foregoing and subject to the qualifications set forth
herein, we hereby advise you that, in our opinion:

         1. The Trust is validly existing as a Trust with transferable shares
under the laws of the State of Delaware.

         2. The Trust is authorized to issue an unlimited number of shares of
beneficial interest, the Shares have been duly and validly authorized by all
action of the Trustees of the Trust, and no action of the shareholders of the
Trust is required in such connection.

         3. The Shares, when issued in accordance with the Trust's Declaration
of Trust and By-Laws, will be legally issued, fully paid and non-assessable by
the Trust, subject to compliance with the 1933 Act, the Investment Company Act
of 1940, as amended, and applicable state laws regulating the offer and sale of
securities.

         With respect to the opinion expressed in paragraph 3 above, we note
that, pursuant to Section 5 of Article IV of the Declaration of Trust, the
trustees have the power to cause any shareholder, or any shareholder of a
particular Series, to pay directly, in advance or arrears, for charges of the
Trust's custodian or transfer, shareholder servicing or similar agent, an amount
fixed from time to time by the trustees, by setting off such charges due from
such shareholder from declared but unpaid dividends owed such shareholder and/or
by reducing the number of shares in the account of such shareholder by that
number of full and/or fractional shares with respect to the outstanding amount
of such charges due from such shareholder.

         We understand that this opinion is to be used in connection with the
registration of the Shares for offering and sale pursuant to the 1933 Act. We
consent to the filing of this opinion with and as a part of the Registration
Statement. In giving such consent, we do not thereby admit that we come within
the category of persons whose consent is required under Section 7 of the 1933
Act or the rules and regulations promulgated thereunder.

                                      Very truly yours,

                                      /s/ Sullivan & Worcester LLP
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                                      SULLIVAN & WORCESTER LLP