Saving Chase

"Saving Chase" is the show's story arc throughout the latter half of season 2. In it, Bree, Oliver, Skylar, Chyna, Angus, Douglas, Leo, Daniel, Olive, and  Fletcher travel back in time to stop Gao from taking over Chase's body, but cause a series of alternate realities and mess up their own histories. They must find a way to fix things to how they're supposed to be, so thye can get back to the present!