14. No Exit

As Damon's behavior escalates from destructive to deadly, Stefan begins to regret their last conversation and decides to track Damon down and intervene. Katherine, masquerading as Elena, decides to accompany him in hopes of sparking a relationship. Dr. Wes enlists the Travelers to set a trap to keep Enzo and Damon trapped in a house until Damon has to feed on Enzo. Enzo calls Stefan for help, but Katherine picks up and decides to try and pit Stefan and Damon against each other. Matt comes back with Nadia and tries to warn Caroline and Tyler, but Nadia compels him before he can.

Caroline and Tyler confront Nadia, but don't get any answers from her or Matt. Elena and Stefan find Damon and Damon attacks Katherine (in Elena's body), forcing Stefan to have to break him apart. He then takes Damon back to their basement and chains him up. Later, when Stefan tries to comfort a dejected Caroline, their conversation leads to them figuring out Katherine has taken over Elena's body.