<P> Elijah continues to tell Elena the story of his family, and he reveals her that the curse of the sun and the moon is fake . Klaus and Elijah made that curse up, but there is another curse that is worse and it is on Klaus . That is the curse Klaus wants to break . At the same time, Alaric / Klaus tells Jenna about vampires but Jenna does not believe him . When she attempts to leave, Klaus tries to stop her, and Stefan attacks Klaus, giving Jenna the opportunity to escape . Stefan calls Elena to let her know that Jenna knows the truth, and Elena leaves Elijah to go to Jenna . In a flashback, we see that Elijah was in love with Katherine back in 1492 . </P> <P> Elena tries to calm Jenna down and tells her the whole truth . Then, she goes back to Elijah, asking him to tell her about the curse . Elijah tells her that his mother was unfaithful to his father and Klaus is a brother from another father, a werewolf, something that makes Klaus both a vampire and a werewolf . Klaus wants to break the curse that is upon him so he can reawaken his werewolf side and create an army of hybrids . Since Klaus is both a vampire and a werewolf, Elijah explains Elena that the dagger cannot kill him, and they have to try to do it using a witch when Klaus is on transition, a moment that makes him weak . Elena tells him that she knows a witch that can channel the power they need, and Elijah tells her that the curse needs to be broken during a full moon . </P> <P> Through another flashback, we see that Elijah found a way to protect the life of the doppelgänger during the sacrifice, meaning he can protect Elena's life . Katherine did not know about that; that is why she ran away from Klaus when she found out what he wanted her for . Elena and Elijah go to the Salvatore house to find Damon and Stefan fighting . Elijah asks for their apology since they tried to kill him; Stefan apologizes but Damon does not trust Elijah . Stefan explains to Elijah that Damon is angry with him at the moment but he will come around at the end and work with them . </P> <P> The episode ends with Klaus (Joseph Morgan) taking his real body back . </P>

When does klaus make an appearance in the vampire diaries