Caroline is a vampire, Mason is a werewolf... and who knows what will happen next on The Vampire Diaries!

Thursday's new episode is titled "Bad Moon Rising" and it will take viewers even more into the world of the Lockwoods and their curse. Based on this promo for the installment, that may mean dangerous things for Stefan.

As seen above, Alaric also makes his return this week. He's pictured above with guest star Courtney Ford, who plays a Duke University graduate student that helps this teacher investigate Isobel's research.

Check out more scenes, via a handful of "Bad Moon Rising" episode stills, below.

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