This time Elena, Stefan, Damon and the other residents of Mystic Falls are joined by sinister new blood. Released from the tomb, Katherine unleashes her personal brand of evil in a diabolical plot. The Originals - the world's oldest and most dangerous vampires - hunt for Elena, who discovers she has a terrifying connection to their world. And now bloodsuckers aren't the only monsters in town. On moonlit nights, werewolves roam in search of victims...including vampires, who succumb to a single werewolf bite.