Elena finds out that Katherine is free from the tomb and is unhappy about this. Damon interrogates Katherine if she knew the fact that killing Elijah with the dagger would also kill him; and she says yes, she knew about it, but wanted her freedom more than anyones life. Stefan and Bonnie try to persuade Jonas and his son to work together with them; however Jonas has a different idea. He wants Elijah alive and to kill Stefan and Damon. He performs a wicca ritual with Luka, which puts Luka in the boardinghouse in invisible form (but his true body remains with his father).

Jonas asks him to remove the dagger from Elijah’s body. When Luka tries to do that, Katherine shows up and blocks him. Jonas then orders Luka to kill her; a confused Katherine then gets staked, but not in her heart, and she screams for Damon. Damon runs to Katherine to pull out the stake and, not knowing about the presence of Luka, uses a flamethrower to prevent the removal of the dagger from Elijah’s body. This results in Luka getting burned back in Jonas’ house, and he dies. Stefan realizes the witch act of Jonas and comes to his house to make peace. But an angry Jonas blames Stefan and Damon for his dead son and wants revenge.

He disables Stefan and tells him that he’s about to find out exactly what loneliness feels like, and leaves the house in a mission to kill Elena. Katherine tells Damon how she made a treaty with John Gilbert so that Damon would die instead of Stefen. In the grill, Caroline sings a song for Matt to get his attention; he is flattered by her act and kisses her in front of the whole crowd. Bonnie tells Elena about her relationship with Jeremy and is surprised by her very positive response.

Jonas shows up at the grill and brings on a massacre there by exploding all the lights and setting a fire. Bonnie tries to stop him, but he disables her; Matt tries to help Bonnie and then Caroline, but Jonas stabs him in the neck with a broken bottle. Caroline sees Matt dying and forces him to drink her blood in order to save his life. Stefan and Elena come to Elena’s house where Bonnie and Jeremy are. Elena goes up to the bathroom where Jonas attacks her, but she responses by killing him; actually she was Katherine, it was all part of the plan to save Elena. Bonnie tells the others that it wasn’t necessary to kill him. She then reaches out to close his eyes, but Jonas attacks her, which results in Stefan breaking his neck.

Alaric tells Jenna that he loves her, and that there are things about the death of Isobel he can’t tell her. Jeremy tries to comfort Bonnie as her last chance to get her powers back has passed, but Bonnie tells him that Jonas actually didn’t attack her; he returned her powers and told her how to kill Klaus. Katherine asks Damon where the site of the “witch massacre” is, but he refuses to tell her anything since he still doesn’t believe that she wants to help them.

Matt awakes and remembers what happened, and Caroline tells him that she’s a vampire. Matt panics and accuses her for the death of his sister Vicki and runs away from Caroline. In the end, Isobel shows up at Elena’s house and tells Jenna that she is Elena’s mother.

“The House Guest” is the sixteenth episode of season 2 of The Vampire Diaries and the 38th episode overall. It first broadcast February 24, 2011 on The CW Network.

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