Isobel is back, and Katherine does exactly what we expected and moves on to what she thinks is the better option. She's wrong, because Isobel set her up and handed her over to Klaus, and then dies in front of Elena. And speaking of Klaus, he's apparently a body snatcher as well as the oldest vampire in existence, because he's taken up shop in Alaric's body. This leads to a showdown between him and Bonnie, where he thinks he gets the upper hand, but thanks to Damon's quick thinking, he's wrong.