She compels Matt to pick a fight with Tyler, intending for Tyler to kill him.

Bonnie eventually convinces Lucy to switch sides. Lucy breaks the link and paralyzes Katherine, allowing Stefan and Damon to throw her into the tomb instead of killing her. Tyler's Transformation

Elena tells Stefan that while Katherine is gone, she still doesn't feel safe and can't be with him right now.

A major subplot involves Katherine's plan to trigger Tyler Lockwood's werewolf curse.

Stefan and Damon decide they can no longer let Katherine terrorize the town. With the help of Bonnie, Jeremy, Caroline, and Alaric, they lure her into a trap at the Lockwood Mansion .