Jules get a final shot at redeeming herself. She tells Elena that she was trying to help Tyler before Klaus started the sacrifice ritual. Tyler survives thanks to Caroline. Matt tells Caroline how he and the Sheriff actually know everything that is going on and he breaks up with her. Caroline finds comfort in Tyler.
Greta feeds Jenna some of her blood to complete Jenna's transformation into a vampire. We find out that Jenna is supposed to be sacrificed. Stefan steps up and decides to offer himself as the sacrifice instead of Jenna. Stefan goes to Klaus with his proposition - Klaus isn't interested and stabs Stefan and tosses him aside. Then, Klaus kills Jenna.
Bonnie, Jeremy, Alaric, and John spend time researching ways for Elena not to turn when Klaus kills her. Bonnie performs some of her witch magic and connects Elena's soul to John's. Klaus drinks Elena's blood and completes the sacrifice. Elena dies and Klaus turns into a werewolf/vampire hybrid. Bonnie shows up. Damon takes down Greta and Bonnie fights off Klaus with her powers. Elijah arrives and gives Klaus a final blow. Elijah thought that Klaus had killed their entire family but it turns out that he just hid them somewhere. Elijah can be united with his family only if he saves Klaus. Elijah apologizes to the gang and runs off with Klaus, the werevamp.
It turns out Bonnie's powers worked and Elena comes back alive, a human, at the expense of John's life. Damon and Stefan plan a small funeral for John. Now Elena has lost her biological mom, dad, and aunt. Earlier in the episode, Damon was bitten by Tyler. Damon is slowly dying and going crazy.