Season 2 Episode 17 episode 17

Vampire Diaries Season 2 Episode 17 "Know Thy Enemy" Sneak Peek

Vampire Diaries Season 2 Episode 17 "Know Thy Enemy" Sneak Peek

The CW has released a tantalizing sneak peek for The Vampire Diaires all new episode, "Know Thy Enemy", airing this Thursday. The clip features the Salvatore brothers and sweet Katherine.