Deciding Isobel's research may hold some clues to the Lockwood family mystery, Damon, Stefan and Elena summon Alaric to Mossy Manse. Praise the Lord and pass the (silver) ammunition; the first idea Alaric offers is lycanthropes, a.k.a. werewolves. Damon -- the vampire -- says there's no way there's any such thing as werewolves, but he and the gang would like to take a look at Isobel's research. The only problem is -- it's all at Duke. Road trip! Stefan's got to stay behind and babysit Caroline, so on the way, Damon works his eye-thing and his Evil Pixie Monster charm, trying to win back Elena's friendship. He even tells her that he saw Jeremy's protect-o-ring before he "killed" him. At Duke, Isobel's star grad student mistakes Elena for Katherine and shoots at her with a crossbow. Luckily, Damon jumps in front of her -- taking the arrow, saving her life, and the day. Poring over Isobel's research, they learn that according to some legends, the vampire is the werewolf's prey-of-choice, and the lycanthrope bite is rumored to kill our favorite bloodsuckers. Bad dog. No biscuit. When Damon is alone with Elena, he also presents her with some additional information on Katherine Pierce (a book entitled Petrova) and reveals Katherine's original name: Katerina Petrova.

Meanwhile, Bonnie cooks up a daywalker ring for Caroline, so Stefan takes her on a bunny (!!!) hunt, and later to Tyler's party at a swimming hole on the old Lockwood grounds. Now that she's a vampire, Caroline's usual, jealous, control-freaky personality goes up to 11, which cheeses off Matt. Mason, who was scoping out the old grounds earlier, orders Tyler to move the party off the premises by nightfall. As the kids are packing up to go, Caroline and Matt kiss and make up, then move off into the woods to make out. Elena calls Stefan and educates him on werewolves. When he goes to warn Caroline, he has to pull her off Matt's carotid. Seems our favorite Pudding Pop cut his arm against a tree and Caroline's lust and bloodlust got all mixed up in a big, hot fangy mess. Stefan saves Matt. Caroline compels him to forget and then? They're stalked by Mason -- who has been transformed into a werewolf. The vampires flee, leaving my Pudding Pop all alone and bleeding, in hopes that the werewolf will follow them. It's a good thing it does, because I'm a carpenter's daughter and can totally whittle. When the fang gang finds Tyler at the ruins, the werewolf catches up to them and attacks Caroline. Stefan pushes it off her but wolfy is ready for another go-round until Tyler yells at him to stop. The wolf obeys and runs off through the woods. I wonder -- does moonstone possession make one a wolf master? Later, Tyler finds Mason's truck. The rear window has been smashed out and Mason's drawers are in the back. Have mercy! Here comes a muddy, nekkid Mason now. (He IS a Brick House.) He asks for his pants back, and Tyler complies, damn it.

Meanwhile, at the Grill, Caroline acts up in order to get Matt to dump her, for his own sake. Back at Gilbert Gables, Alaric finds Jenna and lays a wet one on her -- letting her know he's come to terms with Isobel's "death." Out on the porch, Damon tries to get Elena to forgive him, and even admits that he was lying; he never saw Jeremy's protect-o-ring. Elena says he's lost her friendship forever. Damon says she knew that going in and that she used him, today. She cops to it; he had information about Katherine she needed to know. Damon throws her own words back in her face about how friends don't manipulate each other and leaves her with a final zinger: "You and Katherine have a lot more in common than just your looks." This stings Elena, which is stupid BECAUSE ELENA, GIRL, HE TRIED TO KILL YOUR BABY BROTHER! Ugh.

The next morning, Caroline wakes in the sun to find Katherine hovering over her, telling her they're going to have the bestest time together. Hey! Who invited her in?

I'll be back ASAP with the full weecap. In the meantime, join us on our forum, where we're tending to a broken-hearted Pudding Pop.

See what vloggers Val and Beth think of vampires who prefer high school girls below, in TV is the Answer.

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