The Vampire Diaries

A Virginia high-school student falls for a new boy in class who is actually a centuries-old vampire struggling to live peacefully among humans. Based on the young-adult book series by L.J. Smith.

Season 2, Episode 17 Know Thy Enemy

First Aired: April 7, 2011

Isobel arrives unexpectedly and kidnaps Alaric and Elena. Meanwhile, Bonnie tries to increase her powers by harnessing the energy of former witches who were sacrificed, and Katherine steals the moonstone that is the key to the vampire-werewolf curse.

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