METROPOLITAN SERIES    FUND SUMMARY PROSPECTUS    May 1, 2016 As Amended June 10, 2016

Western Asset Management Strategic Bond Opportunities Portfolio

Class A, Class B and Class E 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 May 1, 2016, and the Portfolio’s financial statements for the year ended December 31, 2015, 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, 2015, 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 Objectives

To maximize total return consistent with preservation of capital.

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. 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
Management Fee		0.59%			0.59%			0.59%
Distribution and/or Service (12b-1) Fees		None			0.25%			0.15%
Other Expenses		0.04%			0.04%			0.04%
Total Annual Portfolio Operating Expenses		0.63%			0.88%			0.78%
Fee Waiver*		(0.04%	)		(0.04%	)		(0.04%	)
Net Operating Expenses		0.59%			0.84%			0.74%

* Restated to reflect that MetLife Advisers, LLC, has contractually agreed, for the period May 1, 2016, through April 30, 2017, to reduce the Management Fee for each Class of the Portfolio to the annual rate of 0.595% of the first $500 million of the Portfolio’s average daily net assets, 0.525% of the next $500 million, 0.500% of the next $1 billion and 0.480% of amounts over $2 billion. This arrangement may be modified or discontinued prior to April 30, 2017, 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 the Portfolio’s operating expenses remain the same, and that all fee waivers for the Portfolio will expire after one year. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

	1 Year		3 Years		5 Years		10 Years
Class A	$	60	$	198	$	348	$	784
Class B	$	86	$	278	$	486	$	1,084
Class E	$	76	$	246	$	431	$	965

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 99% of the average value of its portfolio.

Principal Investment Strategies

Western Asset Management Company (“Western Asset” or “Subadviser”), subadviser to the Portfolio, invests, under normal circumstances, at least 80% of the Portfolio’s net assets in three classes of bonds and other fixed-income securities: (1) U.S. investment grade securities, including U.S. Government securities (e.g., obligations of the U.S. Government or its agencies or instrumentalities) and mortgage-backed securities and other asset-backed securities, and foreign investment grade corporate debt; (2) U.S. and foreign high yield debt of any kind (commonly known as “junk bonds”); and/or (3) foreign government securities. The mortgage- and asset-backed securities in which the Portfolio may invest include those guaranteed or issued by the Government National Mortgage Association or the Federal National Mortgage Association, as well as privately issued mortgage- and asset-backed securities, including collateralized mortgage obligations and collateralized debt obligations.

Depending on market conditions, the Portfolio may invest without limit in high yield debt, which involves significantly greater risks, including price volatility and risk of default in the payment of interest and principal, than investments in higher-quality securities. Although Western Asset does not anticipate investing in excess of 75% of the Portfolio’s assets in domestic and emerging market debt securities that are rated below investment grade, the Portfolio may invest a greater percentage in such securities when, in the opinion of Western Asset, the yield available from such securities outweighs their additional risks.

The Portfolio may invest up to 100% of its assets in foreign securities, including emerging markets.

The Portfolio may also invest in Treasury Inflation Protected Securities and other inflation-linked bonds, repurchase agreements, mortgage dollar rolls, forward commitments, when-issued securities and delayed delivery securities and bank loans.

The Portfolio may invest in derivatives to obtain investment exposure, enhance return, or “hedge” or protect its assets from an unfavorable shift in the value or rate of a reference instrument. The Portfolio may use such derivatives as options, options on futures contracts, currency-related derivatives, swaps, credit default swaps, structured notes and inverse floaters for these purposes. These instruments may be used for any investment purpose, including, for example, in an attempt to adjust the Portfolio’s duration or to lower its exposure to certain risks (e.g., changes in interest rates).

Investment Selection

Western Asset’s investment approach revolves around an investment outlook developed by a team of senior professionals that reviews developments in the economy and the markets and establishes a recommended portfolio structure, including targets for duration, yield curve exposure and sector allocation.

Western Asset’s investment team implements the strategy in a manner consistent with the investment policies of the Portfolio, using information on the relative credit strength, liquidity, issue structure, event risk, covenant protection and market valuation of available securities.

The duration of the Portfolio will generally be approximately 3 to 7 years.

Principal 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 “Principal 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.

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 or 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 fall. 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 fall. Changes in prevailing interest rates, particularly sudden changes, may also increase the level of volatility in fixed income and other markets, increase redemptions in the Portfolio’s shares and reduce the liquidity of the Portfolio’s debt securities and other income-producing holdings. Changes in interest rate levels are caused by a variety of factors, such as central bank monetary policies, inflation rates, and general economic and market conditions.

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.

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. To the extent the Portfolio invests in foreign sovereign debt securities, it may be subject to additional risks.

Emerging Markets Risk.    In addition to all of the risks of investing in foreign developed markets, emerging market securities involve risks attendant to less mature and stable governments and economies, lower trading volume, trading suspension, security price volatility, proceed repatriation restrictions, government confiscation, inflation, deflation, currency devaluation and adverse

Western Asset Management Strategic Bond Opportunities Portfolio

2

government regulations of industries or markets. As a result of these risks, the prices of emerging market securities tend to be more volatile than the securities of issuers located in developed markets.

TIPS and Inflation-Linked Bonds Risk.    The value of inflation-protected securities generally fluctuates in response to changes in real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. Therefore, if inflation were to rise at a faster rate than nominal interest rates, real interest rates might decline, leading to an increase in the value of inflation-protected securities. In contrast, if nominal interest rates increased at a faster rate than inflation, real interest rates might rise, leading to a decrease in the value of inflation-protected securities. When real interest rates are rising faster than nominal interest rates, inflation-indexed bonds, including Treasury Inflation Protected Securities, may experience greater losses than other fixed income securities with similar durations.

High Yield Debt Security Risk.    High yield debt securities, or “junk” bonds, may be more susceptible to market risk and credit and counterparty risk than investment grade debt securities because issuers of high yield debt securities are less secure financially and their securities are more sensitive to downturns in the economy. In addition, the secondary market for high yield debt securities may not be as liquid as that for higher rated debt securities.

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.

Mortgage Dollar Roll Transactions Risk.    Mortgage dollar roll transactions are subject to the risk that the value of the securities the Portfolio is obligated to purchase may decline below the agreed upon purchase price. In addition, the Portfolio may incur higher transaction costs if its mortgage dollar roll transactions lead to higher portfolio turnover. These transactions also may subject the Portfolio to a form of investment leverage.

Loan Investment Risk.    Investments in loans expose the Portfolio to interest rate risk and the credit and counterparty risk of the underlying borrowers of those loans. No active trading market may exist for certain loans. Moreover, adverse market conditions may impair the liquidity of some actively traded loans. The Portfolio may have difficulty valuing and selling loans that are illiquid or are less actively traded. Loans are also subject to the risk that borrowers will prepay the principal more quickly than expected, which could cause the Portfolio to reinvest the repaid principal in investments with lower yields, thereby exposing the Portfolio to a lower rate of return. There may be limited amount of public information about the loans in which the Portfolio may invest. Purchases and sales of loans are generally subject to contractual restrictions that may impede the Portfolio’s ability to buy or sell loans and may negatively affect the transaction price. Loan transactions may take longer than seven days to settle, and the Portfolio may hold cash, sell investments, or temporarily borrow from banks or other lenders in order to meet short-term liquidity needs. The Portfolio may not be entitled to rely on the anti-fraud protections of the federal securities laws with respect to any loans it owns in the event of fraud or misrepresentation by a borrower. The Portfolio’s purchase and sale of loans may involve the risk of market manipulation by a borrower. Any investments in below investment grade loans and other debt securities expose a portfolio to greater market risk and credit and counterparty risk than a portfolio that invests only in investment grade loans and debt securities. Lower rated securities also may be subject to greater price volatility than higher rated investments.

Credit Default Swap Risk.    Credit default swaps may increase credit and counterparty risk (depending on whether the Portfolio is the buyer or seller of the swaps), and they may in some cases be illiquid. Credit default swaps also may be difficult to trade or value, especially in the event of market disruptions. Credit default swap transactions in which the Portfolio is the seller may require that the Portfolio liquidate portfolio securities when it may not be advantageous to do so in order to satisfy its obligations or to meet segregation requirements.

Derivatives Risk.    The Portfolio may invest in derivatives to obtain investment exposure, enhance return or “hedge” or protect its assets from an unfavorable shift in the value or rate of a reference instrument. Derivatives can significantly increase the Portfolio’s exposure to market risk, credit and counterparty risk and other risks. Derivatives may be illiquid and difficult to value. Because of their complex nature, some derivatives may not perform as intended. As a result, the Portfolio may not realize the anticipated benefits from a derivative it holds or it may realize losses. Derivative transactions may create investment leverage, which may increase the Portfolio’s volatility and may require the Portfolio to liquidate portfolio securities when it may not be advantageous to do so.

Forward Commitment, When-Issued and Delayed Delivery Securities Risk.    Investments in forward commitments and when-issued and delayed delivery securities are subject to the risk that the value or yield of the securities the Portfolio is obligated to purchase may decline below the agreed upon purchase price or expected yield before the securities are actually issued or delivered. These investments may create a form of investment leverage, which may increase the Portfolio’s volatility and may require the Portfolio to liquidate portfolio securities when it may not be advantageous to do so.

Repurchase Agreement Risk.    Repurchase agreements are subject to credit and counterparty risk. In the event a counterparty

Western Asset Management Strategic Bond Opportunities Portfolio

3

defaults, becomes insolvent or otherwise becomes unable or unwilling to honor its obligation to the Portfolio, the Portfolio may incur delays or restrictions on its ability to dispose of the underlying securities and lose all or a part of the income from the repurchase agreement.

Portfolio Turnover Risk.    The investment techniques and strategies utilized by the Portfolio might result in a high degree of portfolio turnover. High portfolio turnover rates will increase the Portfolio’s transaction costs, which can adversely affect the Portfolio’s performance.

Past Performance

The information below provides some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and how the Portfolio’s average annual returns over time compare with those of a broad-based securities market index. 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. Effective May 1, 2006, Western Asset became the subadviser. Investment performance prior to that date is attributable to the Portfolio’s former subadviser.

Year-by-Year Total Return for Class A Shares as of December 31 of Each Year

Highest Quarter	2nd – 2009	13.24%
Lowest Quarter	3rd – 2008	-6.68%

Average Annual Total Return as of December 31, 2015
	1 Year			5 Years			10 Years
Class A		-1.72	%		4.40	%		5.55	%
Class B		-2.00	%		4.15	%		5.29	%
Class E		-1.90	%		4.23	%		5.39	%
Barclays U.S. Aggregate Bond Index (reflects no deduction for mutual fund fees or expenses)		0.55	%		3.25	%		4.51	%

Management

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

Subadviser.    Western Asset Management Company is the subadviser to the Portfolio.

Portfolio Managers.    The Portfolio has been managed since 2006 by a team at Western Asset. This team is led by S. Kenneth Leech, Chief Investment Officer, along with Carl L. Eichstaedt, Portfolio Manager, Mark Lindbloom, Portfolio Manager, Michael Buchanan, Portfolio Manager and Chia-Liang Lian, Portfolio Manager. Messrs. Eichstaedt, Lindbloom and Buchanan have been on the team since 2006. Mr. Lian and Mr. Leech have been on the team since 2015 and 2014, respectively.

Purchase and Sale of Portfolio Shares

Shares of the Portfolio are only sold to separate accounts of Metropolitan Life Insurance Company and its affiliates to fund Contracts. For information regarding the purchase and sale of the Portfolio’s shares, please see the prospectus for the relevant Contract.

Tax Information

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

Payments to Broker-Dealers and Other Financial Intermediaries

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.

Western Asset Management Strategic Bond Opportunities Portfolio

4