Watch The Vampire Diaries Season 2 Episode 17: Know Thy Enemy Online

	IMDB Rating: 8.7/10 from 631 votes
	Release: 2011 / The Vampire Diaries / Season 2 / Episode 17
	Genre: Drama \| Fantasy \| Horror
	Director: Wendey Stanzler
	Stars: Nina Dobrev, Paul Wesley, Ian Somerhalder
	Synopsis: Jeremy is delighted to have Bonnie restored to her powers, yet worried when accompanying her and Damon to the house where a 100 witches were burned to gather enough power to undo the moonstone's curse. Elena's mother Isobel Flemming's return startles her and even Katherine, as turns out doing Klaus's bidding for a gruesome 'prize'. John Gilbert confesses more wrong choices, also at Jenna's expense, yet unlike furious Alaric, Elena ends up choosing to keep her father in her life. The Salvatore brothers piece together from the Gilbert diaries what they believe equals a secret weapon. Matt can't handle the vampire truth and get Caroline to wipe his memory.