Watch The Vampire Diaries Season 6 Episode 4 Online if you want to know why Damon had one of the worst days of his life back in 1994. It turns out that was around the time that Damon decided to return to his old home in Mystic Falls. Stefan had a strict set of rules and Damon broke them leading to an insane fight that left a high body count, including Zack Salvatore's pregnant girlfriend.

It turns out that on that day, Kai murdered almost his whole family out in Oregon. Kai is part of the Gemini Coven and was banished to relive that day out in Mystic Falls. He has a tool that can get Bonnie and Damon out of there but he needs Bonnie's power. Kai gets his power by stealing it from others, sometimes to the point of their death. Bonnie clearly isn't down with this idea but Kai is going to use her power, with or without their permission. Now they just have to decide whether or not they're going to go along with him.

Elena and Stefan spend a day in Stefan's new life playing pretend. Stefan shows Elena how he re-invents himself. Then we find out that Stefan also takes out his anger, aggression, and despair by picking fights. When Elena calls him on it, he calls her on compelling away her memories of Damon.

Elena talks to Alaric and is left with the choice to try and start anew or let Alaric bring her memories back.

Meanwhile back in Mystic Falls, Matt finds Enzo being held prisoner. Jeremy finds Sarah and it turns out that Sarah is the daughter of the pregnant woman Damon killed and Zack Salvatore.