It was a night of revelations on Thursday's episode of The Vampire Diaries, when Elena learned Katherine's true origins and Tyler discovered Uncle Mason's secret.
Curious to see if the Lockwoods could be werewolves, Elena set off with Alaric and Damon on a trip to Duke University to consult birth mom Isobel's supernatural research. The trio met her assistant Vanessa, who told them werewolves are now rare, thanks to vampires who fear their deadly bites and hunt them down.
After Elena phoned Stefan to warn him about the possible new threat, the threesome set off for Mystic Falls – but not before Damon revealed one last surprise. To get back in Elena's good graces, he produced a book he had swiped from Isobel's office containing information about Katherine, who turned out to be European and went by the last name Petrova.
Joining the ranks of Mystic Falls's many vampires on Thursday's episode of The Vampire Diaries was Caroline, who after being strangled by Katherine with Damon's blood in her system, awoke in her hospital bed with a craving – for blood. Initially unsure of what was happening, Caroline couldn't fight off the desire to drink a blood bag and soon realized she could no longer step into sunlight. Waiting until nightfall, she hypnotized a nurse into discharging her, but not before extending her newly formed fangs.
Heading to the town's carnival, Caroline first found Damon, and after revealing she had been turned, passed on Katherine's message. A shocked Damon gathered Stefan and Elena to discuss how to handle the latest vampire on the loose, while Caroline next found boyfriend Matt and attempted to spend a romantic evening with him. But as he held her close and she heard his heart beating, the new vamp was overcome with a desire to feed and immediately ran off.
Picking up right where season 1 left off, The Vampire Diaries returned with a vengeance Thursday as Katherine (Nina Dobrev) managed to immediately insert herself between a barely united Stefan (Paul Wesley) and Damon (Ian Somerhalder).
After realizing he had kissed Katherine and not Elena, Damon felt the sting of Elena's rejection when she told him she wasn't surprised he would make a move on her, but was surprised he thought she'd ever reciprocate. Feeling hurt, Damon fell into old habits, resisting the urge to kill Katherine the next time they met and instead, passionately throwing himself at her. But their reunion proved short-lived when Damon asked her to finally pick just one Salvatore brother, and Katherine chose Stefan, saying she never loved Damon and it was Stefan she came back for.
Never one to give up without a fight, a drunken Damon later surprised Elena in her bedroom and attempted to convince her that there was something between them, even managing to plant a kiss. But echoing Katherine's sentiments from earlier that night, Elena also chose Stefan, saying he would always be the one for her.
In an early episode of the CW's hit drama, bad boy vampire Damon Salvatore (played by Ian Somerhalder) flipped through a book in the Twilight series and dismissed it, saying, "This book, by the way, has it all wrong." Scoffing at the idea of a vampire that "sparkles," he also added, "I live in the real world where vampires burn in the sun."
While the show is on winter hiatus, The CW is resurrecting The Vampire Diaries' first ten episodes with a week-long marathon, airing two episodes each night, starting Monday (8 p.m. EST).
Based on the 1991 book series by L.J. Smith, the show centers on feuding vampire brothers Stefan and Damon Salvatore as they vie for the love of mortal beauty Elena Gilbert. Developed for the small screen by Dawson's Creek and Scream scribe Kevin Williamson, the drama has proved to be one of fall's breakout hits, making this week's marathon the perfect time to get caught up before the show's January return.
Unsure about taking on another supernatural saga? Here are three reasons to sink your teeth into The Vampire Diaries: