“Teen Wolf”: In the first episode of Season 3, we’ll meet Deucalion, the leader of the new pack of Alpha werewolves. He’s eloquent, intelligent, and he has a plan to turn Scott and Derek against each other. Meanwhile, Isaac — who is expected to feature prominently this season — will have a very rough time in the first episode. He’s going to be badly injured, and even the hospital isn’t safe. He does have someone looking out for him, though. Hmm.