Know Thy Enemy
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Know Thy Enemy
Know Thy Enemy is the seventeenth episode of the second season of The Vampire Diaries and the thirty-ninth episode of the series.
HIDE IN PLAIN SIGHT - 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.
Main CastNina Dobrev as Elena Gilbert/Katherine PiercePaul Wesley as Stefan SalvatoreIan Somerhalder as Damon SalvatoreSteven R. McQueen as Jeremy GilbertSara Canning as Jenna SommersKat Graham as Bonnie BennettCandice Accola as Caroline ForbesZach Roerig as Matt DonovanMichael Trevino as Tyler LockwoodMatt Davis as Alaric Saltzman/Klaus
Recurring CastMia Kirshner as Isobel FlemmingDavid Anders as John GilbertMarguerite MacIntyre as Elizabeth ForbesBryton James as Luka MartinGino Anthony Pesi as MaddoxSusan Walters as Carol LockwoodMichael Roark as Frank
TriviaAntagonist: KlausFirst appearance of Klaus, though only in Alaric's body.Tyler does not appear in this episodeHilariously Damon has a closet full of black leather jacketsIsobel dies in this episode, making her the second character whose name is also an episode title to die, after Rose.This is the first time we see a lapis lazuli daylight ring stop working.This is the first episode to show a vampire killed by sunlight exposure (Isobel).
Body CountIsobel - Suicide as a result of Klaus' compulsion.
Production NotesThe name of the episode was revealed on Valentine's Day by Ian Somerhalder.This episode has only two songs on the soundtrack, making the episode with the least songs featured.This is the first episode where Katerina Graham is credited as Kat Graham instead of Katerina.Matt Davis becomes the second main cast member to have a dual role, after Nina Dobrev.All five characters from Season One that reappear in this episode:'Zdravei' which Klaus (in Alaric's body) said to Katherine means 'hello' in Bulgarian.
Cultural References"Know your enemy", a saying derived from Sun Tzu's The Art of War.
Behind the ScenesThis episode had about 2.73 million viewers in USA which was 0.26 million less than the previous episode.
"Give Me Strength" - Snow Patrol
"Halfway Gone" - Piano Tribute Players