Bonnie has an unsettling encounter with Luke (CHRIS BROCHU), and learns more about his family history. The Travelers' leader, Markos (RAFFI BARSOUMIAN), arrives in Mystic Falls.

Elena and Stefan start having dreams about an alternate version of their lives; The Travelers move in on Mystic Falls; Matt has a frightening encounter on the Other Side.

Enzo holds Elena, Stefan and Bonnie hostage to uncover the truth about the love of his life. Markos performs a ritual to undo witch's magic.

Damon and Caroline suspect Stefan and Elena of keeping a secret while they hide from the travelers, unaware of the dead man out for revenge. Meanwhile Matt, Jeremy and Bonnie help Tyler get rid of Julian.

When Stefan and Elena escape from Markos' control, only to find themselves Stranded in a remote location, Stefan gets philosophical with Elena about her relationship with Damon. After their attempt to protect the doppelgangers goes badly, Liv and Luke come up with a dangerous new strategy. Damon recruits Matt and Jeremy to help him set a trap for Markos, who turns out to have a devastating surprise of his own. Bonnie finally admits to Caroline that she's been keeping the truth about the Other Side from everyone. Finally, while Bonnie searches desperately for a way to stop Markos, Caroline is witness to an unthinkable act of violence by one of the Travelers.

Damon's plan causes a huge explosion in Mystic Falls, and everyone is caught up in the confusion, leaving a trail of heroism, sacrifice, relief and despair.