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Know Thy Enemy

The Vampire Diaries

S2, E17: Know Thy Enemy

Available on iTunes, Netflix
Isobel unexpectedly returns, leaving Jenna devastated and causing both Elena and Alaric to lash out at John. Meanwhile, Bonnie, Damon and Jeremy try to find a spell to harness her ancestors' power, and a heartbroken Caroline attempts to figure out what to do about Matt. Elsewhere, Stefan and Damon realise that they have a new weapon.