The Vampire Diaries Season 2 Episode 17 Know Thy Enemy ( Air Date 2011-04-07 ) Genre Drama, Sci-Fi & Fantasy category. Overview "Elena and Alaric both lash out at John when Isobel’s unexpected arrival leaves Jenna devastated. Bonnie works with Damon and Jeremy to find the spell they’ll need to harness her ancestors’ power. A heartbroken Caroline doesn’t know what to do about Matt. Stefan and Damon realize they have a new secret weapon.".
The Vampire Diaries Season 2 Episode 17 Know Thy Enemy
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- Watch: The Vampire Diaries Season 2 Episode 17 Know Thy Enemy on CWR-CRB
- Stars: Paul Wesley, Ian Somerhalder, Kat Graham, Candice King, Zach Roerig, Michael Malarkey, Matthew Davis
- Director: Noelle Jean-Baptiste, Chris Mollere, L.J. Smith, Leslie Morgenstein, Kevin Williamson, Julie Plec, Michael Suby
