This season, Katherine's appearance in Mystic Falls will throw a wrench into the love triangle between Stefan, Elena and Damon, and the other residents of Mystic Falls must choose sides as they fall victim to a new breed of danger. New and unexpected friendships will be forged, allies will become enemies and hearts will be broken. Plus, Stefan and Damon will be forced to face a villain more evil and diabolical than they thought possible.

Life hasn't been the same for Elena since the tragic death of her parents, but she tries to pick up the pieces and provide support for her troubled younger brother, Jeremy. On her first day back at Mystic Falls High School, Elena meets the mysterious new guy, Stefan, and the two seeming lost souls form an instant connection. What Elena doesn't know, however, is that Stefan is a vampire, constantly resisting the urge to taste her blood. But Stefan, it seems, has a greater evil to deal with when his dangerous older brother, Damon, shows up to wreak havoc on the town of Mystic Falls — and claim Elena for himself.

Season three opens the door to learn more about Klaus and the Original Family as his motives for wanting Stefan on his side are finally revealed. As Stefan sinks deeper into the dark side, Damon and Elena struggle with the guilt of their growing bond, even as they work together to bring Stefan back from the edge.

The fourth season starts off with everything in transition. Elena faces her worst nightmare as she awakens from her deadly accident to find she must now endure the terrifying change of becoming a vampire — or face certain death. Stefan and Damon are torn even further apart over how to help Elena adjust to a life she never wanted, and everyone must cope with the chaos created after the vampires and their supporters were outed to the town council and local leaders. Despite everything, as Elena and her friends enter into the final stretch of high school before graduation sends them on different paths, they feel the bond to their home town of Mystic Falls take on a deeper meaning when a new mysterious villain is introduced who seems intent on destroying it.