Plot summary
Matt and Caroline are in the Lockwood cellar while Tyler, in wolf form, attacks them, and they hide. Meanwhile, Greta the witch feeds Jenna her blood, completing Jenna's transformation into a vampire. Elijah is revealed to be seeking revenge on Klaus for killing his family and burying their bodies at sea. Klaus begins the ritual and kills Jules, the werewolf. Stefan offers to switch places with Jenna, but Klaus refuses and kills her. Bonnie performs a spell that can bring someone back to life by joining two people's souls, binding John and Elena.
At the ritual grounds, Klaus drains Elena's blood and begins to transform. However, Bonnie uses her powers to weaken him while Damon kills Greta. Before Elijah can rip out his heart, Klaus says he didn't bury the bodies at sea and if he is killed, Elijah will never find them. Elijah listens to him and flees with Klaus. When Elena comes back to life, John dies. At Jenna's and John's funeral, Damon reveals to Stefan that he was bitten by Tyler and asks him to not tell Elena.
Credits
Adapted from Wikipedia contributors, The Vampire Diaries season 2. HTML formatting and reference markers removed.