METROPOLITAN SERIES    FUND SUMMARY PROSPECTUS    April 30, 2012

Barclays Capital Aggregate Bond Index Portfolio

Class A, Class B, Class E and Class G Shares

Before you invest, you may want to review the Portfolio’s Prospectus, which contains more information about the Portfolio and its risks. You can find the Portfolio’s Prospectus and other information about the Portfolio (including the documents listed below) online at www.metlife.com/variablefunds. You can also get this information at no cost by calling 1-800-638-7732 or by sending an e-mail request to RCG@metlife.com. The Portfolio’s Prospectus and Statement of Additional Information, both dated April 30, 2012, and the Portfolio’s financial statements for the year ended December 31, 2011, including the notes to the financial statements, the financial highlights and the report of the Portfolio’s independent registered public accounting firm, all of which are included in the Annual Report of the Portfolio, dated December 31, 2011, are all incorporated by reference into this Summary Prospectus. This Summary Prospectus is intended for individuals who have purchased certain variable life insurance policies and variable annuity contracts (collectively, “Contracts”) from Metropolitan Life Insurance Company and its affiliates and is not intended for use by other investors.

Investment Objective

To track the performance of the Barclays U.S. Aggregate Bond Index.

Fees and Expenses of the Portfolio

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. These fees and expenses are based on the year ended December 31, 2011, and are expressed as a percentage of the Portfolio’s average daily net assets over that period. The table and the Example below do not reflect the fees, expenses or withdrawal charges imposed by the Contracts. See the Contract prospectus for a description of those fees, expenses and charges. If Contract expenses were reflected, the fees and expenses in the table and Example would be higher.

Shareholder Fees (fees paid directly from your investment)—None

Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class A			Class B			Class E			Class G
Management Fee		0.25%			0.25%			0.25%			0.25%
Distribution and Service (12b-1) Fees		None			0.25%			0.15%			0.30%
Other Expenses		0.03%			0.03%			0.03%			0.03%
Total Annual Portfolio Operating Expenses		0.28%			0.53%			0.43%			0.58%
Fee Waiver(1)		(0.01%	)		(0.01%	)		(0.01%	)		(0.01%	)
Net Operating Expenses(1)		0.27%			0.52%			0.42%			0.57%

(1) MetLife Advisers, LLC has contractually agreed, for the period April 30, 2012 through April 30, 2013, to reduce the Management Fee for each Class of the Portfolio to the annual rate of 0.25% for the first $500 million of the Portfolio’s average daily net assets, 0.245% for the next $500 million, 0.24% for the next $1 billion and 0.235% for amounts over $2 billion. This arrangement may be modified or discontinued prior to April 30, 2013, only with the approval of the Board of Trustees of the Portfolio.

Example

The following Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year, that you reinvest all of your dividends and that the Portfolio’s operating expenses remain the same. The Example also assumes the expiration of the fee waiver agreement after one year. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

	Class A		Class B		Class E		Class G
1 Year	$	28	$	53	$	43	$	58
3 Years	$	89	$	169	$	137	$	185
5 Years	$	156	$	295	$	240	$	323
10 Years	$	355	$	664	$	541	$	725

Portfolio Turnover

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 23% of the average value of its portfolio.

Principal Investment Strategies

The Barclays U.S. Aggregate Bond Index (the “Index”) is a broad measure of the U.S. investment-grade fixed-income securities market. MetLife Investment Advisors Company, LLC (“MLIAC”), subadviser to the Portfolio, will invest in a selected stratified sample of the bonds included in the Index. The bonds purchased for the Portfolio are chosen by MLIAC to, as a group, reflect the composite performance of the Index. Although the Portfolio tries to mirror the performance of the Index, its performance will generally not exactly match the Index because,

among other things, the Portfolio incurs operating expenses. The Index is an unmanaged group of fixed-income securities, and therefore does not have these expenses. The Portfolio may continue to hold debt securities that no longer are included in the Index, if, together with any money market instruments or cash, such holdings are no more than 20% of the Portfolio’s net assets. The types of fixed-income securities generally included in the Index are U.S. Government Securities (e.g., obligations of the U.S. Government or its agencies or instrumentalities), debt obligations issued or guaranteed by U.S. corporations, debt obligations issued or guaranteed by foreign companies, sovereign governments, municipalities, governmental agencies or international agencies, asset-backed securities, residential and commercial mortgage-backed securities, and zero coupon securities.

MLIAC, under normal circumstances, invests at least 80% of the Portfolio’s net assets in debt securities included in the Index.

MLIAC may rebalance the Portfolio due to, among other things, cash flows into and out of the Portfolio or changes in the Index.

Primary Risks

As with all mutual funds, there is no guarantee that the Portfolio will achieve its investment objective. You could lose money by investing in the Portfolio. An investment in the Portfolio through a Contract is not a deposit or obligation of, or guaranteed by, any bank, and is not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. Government.

The value of your investment in the Portfolio may be affected by one or more of the following risks, which are described in more detail in “Primary Risks of Investing in the Portfolio” in the Prospectus, any of which could cause the Portfolio’s return or the price of its shares to decrease or could cause the Portfolio’s yield to fluctuate. Please note that there are many other circumstances that could adversely affect your investment and prevent the Portfolio from reaching its objective, which are not described here.

Market Risk.    The Portfolio’s share price can fall because of, among other things, a decline in the market as a whole, deterioration in the prospects for a particular industry or company, or changes in general economic conditions, such as prevailing interest rates and investor sentiment. Significant disruptions to the financial markets could adversely affect the liquidity and volatility of securities held by the Portfolio.

Interest Rate Risk.    The value of the Portfolio’s investments in fixed income securities may decline when prevailing interest rates rise or increase when interest rates go down. The longer a security’s maturity or duration, the greater its value will change in response to changes in interest rates. The interest earned on the Portfolio’s investments in fixed income securities may decline when prevailing interest rates decline.

Credit and Counterparty Risk.    The value of the Portfolio’s investments may be adversely affected if a security’s credit rating is downgraded; an issuer of an investment held by the Portfolio fails to pay an obligation on a timely basis, otherwise defaults or is perceived by other investors to be less creditworthy; or a counterparty to a derivatives or other transaction with the Portfolio files for bankruptcy, becomes insolvent, or otherwise becomes unable or unwilling to honor its obligation to the Portfolio.

Passive Management Risk.    In attempting to track the returns of an index, the Portfolio may be more susceptible to risks because it generally will not use any defensive strategies to mitigate its risk exposure. In addition, the Portfolio’s returns may deviate from the index it seeks to track as a result of, among other things, portfolio operating expenses, transaction costs and delays in investing cash.

Foreign Investment Risk.    Investments in foreign securities tend to be more volatile and less liquid than investments in U.S. securities because, among other things, they involve risks relating to political, social and economic developments abroad, as well as risks resulting from differences between the regulations and reporting standards and practices to which U.S. and foreign issuers are subject. To the extent foreign securities are denominated in foreign currencies, their values may be adversely affected by changes in currency exchange rates. All of the risks of investing in foreign securities are typically increased by investing in emerging market countries.

Mortgage-Backed and Asset-Backed Securities Risk.    The value of investments in mortgage-backed and asset-backed securities is subject to interest rate risk and credit risk. These securities are also subject to the risk that issuers will prepay the principal more quickly or more slowly than expected, which could cause the Portfolio to invest the proceeds in less attractive investments or increase the volatility of their prices. To the extent mortgage-backed and asset-backed securities held by the Portfolio are backed by lower rated securities, such as sub-prime obligations, or are subordinated to other interests in the same mortgage or asset pool, the likelihood of the Portfolio receiving payments of principal or interest may be substantially limited.

Zero Coupon Securities Risk.    Zero coupon securities may experience greater volatility in market value due to changes in interest rates than other income-producing securities. As a result of owning these securities, the Portfolio may have to liquidate other portfolio securities at inopportune times to satisfy its distribution obligations.

Past Performance

The information below shows the volatility of the Portfolio’s returns from year to year and how the Portfolio’s average annual returns over time compare with those of a broad-based securities market index. Both the bar chart and table assume reinvestment of dividends and distributions. Note that the results in the bar chart and table do not include the effect of Contract charges. If these Contract charges had been included, performance would have been lower. As with all mutual funds, past returns are not a prediction of future returns. MLIAC was organized on October 3,

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2006 to succeed to certain parts of the investment advisory business of its affiliate, Metropolitan Life Insurance Company (“Metropolitan Life”). In connection therewith, on April 30, 2007, the Portfolio changed its subadviser from Metropolitan Life to MLIAC. Performance information set forth below includes results prior to this change.

The bar chart below shows you the performance of the Portfolio’s Class A shares for the last ten full calendar years and indicates how it has varied from year to year. The Portfolio can also experience short-term performance swings as indicated in the high and low quarter information at the bottom of the chart. The table below compares the Portfolio’s average annual compounded total returns for each class with index returns. For more information about indexes, please see “Index Description” in the Prospectus. It is not possible to invest directly in an index.

Year-by-Year Total Return as of December 31 of Each Year

Highest Quarter	4th – 2008	4.91%
Lowest Quarter	2nd – 2004	-2.46%

Average Annual Total Return as of December 31, 2011
	1 Year		5 Years		10 Years		Since Inception		Inception Date
Class A		7.51%		6.31%		5.55%		—		—
Class B		7.28%		6.05%		5.29%		—		—
Class E		7.38%		6.16%		5.39%		—		—
Class G		7.15%		N/A		N/A		6.47%		4-28-09
Barclays U.S. Aggregate Bond Index (reflects no deduction for mutual fund fees or expenses)		7.84%		6.50%		5.78%		—		—

Management

Adviser.    MetLife Advisers, LLC (“MetLife Advisers”) is the Portfolio’s investment adviser.

Subadviser.    MetLife Investment Advisors Company, LLC (the “Subadviser”) is the subadviser to the Portfolio.

Portfolio Managers.    Stacey Lituchy and Tresa Lau are the managers of the Portfolio. Tomas Cambara is the assistant manager of the Portfolio. Ms. Lituchy has been the senior manager of the Portfolio since 2002. Ms. Lau has been a manager of the Portfolio since 2002. Mr. Cambara has been the assistant manager of the Portfolio since 2007.

Tax Information

For information regarding the tax consequences of Contract ownership, please see the prospectus for the relevant Contract.

Payments to Insurance Companies and Their Affiliates

The Portfolio is not sold directly to the general public but instead is offered as an underlying investment option for Contracts issued by insurance companies that are affiliated with the Portfolio and MetLife Advisers. As a result of these affiliations, the insurance companies may benefit more from offering the Portfolio as an investment option in the Contracts than offering other unaffiliated portfolios. The Portfolio and its related companies may also make payments to the sponsoring insurance companies (or their affiliates) for distribution and/or other services. The benefits to the insurance companies of offering the Portfolio over unaffiliated portfolios and these payments may be factors that the insurance companies consider in including the Portfolio as an underlying investment option in the Contracts and may create a conflict of interest. The prospectus for your Contract contains additional information about these payments.

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