Much like viewers, Damon and Stefan can't help but wonder if Bonnie can really kill Klaus in this clip from Thursday's all-new episode of The Vampire Diaries.

The Salvatore brothers also ponder what happened to Katherine, and whether the woman who transformed them both in so many ways is now gone forever.

Check out the clip from "The Last Dance" below, and follow this link for a full photo gallery for another, more colorful glimpse at this week's episode ...

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