Elena brought Elijah back to life. He revealed a lot of information. Damon and Stefan fought over how to protect Elena. Jenna discovered the truth. Klaus exchanged Alaric's body for his own one, with the help of his witch/henchman and Luka's sister.
The episode began how the last one ended, with Elena sitting in the basement, waiting for Elijah to come to life. the way he reawakened, although it has been widely criticized, was believable, and therefore served it's purpose. the effect of being in the house uninvited also answered some previously unanswered questions. then again, elijah answered a lot of unanswered questions, and gave new meaning to a lot that had happened. some new questions were raised, like why was klaus so hell-bent on using the doppelganger to break the spell? do the similarities between elijah and stefan, and damon and klaus mean that damon will inevitably be evil? what is the other way to break the spell on klaus? elena proved to elijah that she keeps her word, and elijah proved that he is, at the very least, good at PRETENDING to have integrity. damon had serious character-development, and is showing himself to truly be a good person at heart. he barely compelled andie throughout the episode, and showed, with their interactions that he wants more than sex now. he wants an actual connection. klaus was all that he's been trumpeted as being: cruel, self-obsessed, selfish and murderous. and was just as imposing as was hoped he'd be. the filmography was fantastic, and the addition of jenna to the ranks of the aware will hopefully be utilised, not simply be pushed aside. looking forward to seeing jeremy, bonnie, caroline and tyler soon. should be awesome.