Watch The Vampire Diaries Season 2 Episode 17 this coming April 7, 2011 on CW. The newest episode of The Vampire Diaries Season 2 Episode 17 is entitled “Know Thy Enemy“. The upcoming episode of The Vampire Diaries Season 2 Episode 17 is making a huge comeback as the series resolve in hiatus for about two months. The Vampire Diaries Season 2 Episode 17: Know Thy Enemy will give us exciting Thursday night. On this episode of The Vampire Diaries Season 2 Episode 17, as Caroline is nibbling the pain after she was broken hearted and she doesn’t know what to do over Matt. On the thrilling side, after dodging into a tough situation, Stefan and Damon have come to realize that they are handling a powerful weapon which they could use as an advantage in their plans. Elena and Alaric are upset with John after Isobel’s unexpected arrival devastates Jenna. Damon, Jeremy, and Bonnie search for the spell they’ll need to harness the power of Bonnie’s ancestors. Watch The Vampire Diaries Season 2 Episode 17 episode which is scheduled to air its premiere broadcast on April 7, 2011 on The CW at 8/7c.