3. Bad Moon Rising

Complete story — includes the ending

Elena, Damon, and Alaric head to Isobel's old office at Duke University, where it is revealed that vampires and werewolves used to roam freely until a shaman uttered a curse to limit their powers, after which the werewolves were servants of the moon and vampires became the slaves of the sun. Stefan teaches Caroline how to control herself and hunt animals. Bonnie makes Caroline a daylight ring so that she will not be burned by the sun. In werewolf form, Mason encounters Stefan and Caroline. Tyler saves them by shouting at the werewolf; he later finds Mason in the woods and realises what has happened. Unable to control herself, Caroline feeds on Matt. She compels him to forget it, but ends their relationship to keep him safe from her. Damon tells Elena Katherine's real name, Katerina Petrova, to aid Elena with her research. Alaric reaffirms his romantic interest in Jenna, and Caroline finds Katherine in her bedroom.