A sneak peek at this week's all-new episode of The Vampire Diaries, "Know Thy Enemy." Can we trust Katherine? It's an age-old question ...
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In part two of this Vampire Diaries promo, Paul Wesley speaks directly to viewers. But he does it as the character of Stefan Salvatore.
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Ian Somerhalder speaks directly to viewers in this promo for The Vampire Diaries. But he does it as the character of Damon Salvatore.
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Everything you know is about to change. So teases this Vampire Diaries preview for "Know Thy Enemy."
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The Vampire Diaries Season 2 Episode 17 Quotes

Don't mistake the fact that we haven't set you on fire in your sleep for trust.

Damon

I'll be super pissed if you lock me out.

Damon