Kill or Be Killed is the fifth episode of the second season of The Vampire Diaries and the twenty-seventh episode of the series.
MASON'S PAST IS REVEALED - Tyler learns more about the Lockwood family curse from Mason. Stefan and Damon argue over how to handle Mason. Elena tries to keep Jeremy from becoming more involved with the Lockwood mystery, but Jeremy makes an effort to hang out with Tyler and Mason gives Sheriff Forbes some startling information, leading to a night of violence, confessions and heartbreak.
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