Supersonic
performed by Vava Voom; features Sean Kingston

Still reeling from Enzo murdering his girlfriend Ivy, Stefan compels his boss at the auto repair shop to give him a few days off so that he can hunt him down. Meanwhile, Elena seems over the top ecstatic since Alaric compelled her to forget all of her Damon memories. Stefan appears at Whitmore College, surprising Elena, who has just invited Liam to the party at the swimming hole. In the parallel dimension, while Bonnie and Damon are discussing the mysterious crossword puzzle incident during grocery shopping, more strange things happen--food items missing from shelves; the merry-go-round is activated; Damon's car appears in the parking lot, all which lead Damon to discover someone named Kai. In the other world, Stefan attempts to confront Enzo, but Enzo thwarts him and kills a vampire hunter who had followed them into the woods. Kai reveals that he has been following Damon and Bonnie, right before he announces that he wants to kill Damon just as Damon takes a drink of bourbon laced with vervain. Bonnie saves Damon by regaining her magic, and she and Damon capture Kai, who later admits that he faked the attempted killing of Damon to motivate Bonnie to regain her magic. Jeremy's latest fling Sarah disappears. In a diner, Tripp Fell stabs Enzo with a syringe filled with vervain, which Enzo shakes off, right before Stefan stakes him.