A senior prank night takes a deadly turn when Klaus finds out that Elena is still alive. Klaus threatens Elena by feeding Tyler his blood and kills him. He tells Bonnie that if she doesn't find a way to create hybrids, Tyler dies. He also tells Stefan to feed on Elena. Stefan tries to stop his urge, but Klaus makes him turn off his emotions and feed on her. Klaus finds out that Elena's blood is needed to create more hybrids. Meanwhile, Katherine and Damon go on a road trip to find a way to kill Klaus. Katherine remembers that Pearl told her about Mikael, the vampire hunter who was also a vampire. Matt, in an attempt to connect with Vicki, commits suicide. In a vision he sees her, and she tells him she can come back to life and has a message for Bonnie. Elena is in the hospital while a nurse, compelled by Klaus, takes her blood. Klaus is waiting to abduct Elena, but he flees when Damon tells him that Mikael is coming. Damon then saves Elena. Moments later, Stefan returns. Jeremy and Katherine find Mikael's tomb and watch as he opens his eyes.
