Due to Maze Runner schedule issues, fan favorite Stiles actor Dylan O'Brien only appeared in two episodes of the last season. Tyler Hoechlin, who portrayed Scott's erstwhile adversary and alpha wolf Derek Hale, had already departed the show before season 5 to pursue a career in film (via Buzzfeed). When he returned for the final two episodes, it was as another character: new guy Jake. Apparently, creator Jeff Davis wanted to shake things up by bringing in someone new. Here's where things get a little fuzzy. Some fans believe that O'Brien was let go from the show, while others claim that he quit. Either way, it seems like a bad idea for a sitcom to have its main cast change every year, so we can probably rule out Teen Wolf being on the air for longer than five seasons currently planned. Stiles' departure was actually supposed to happen earlier in the series, but due to creative differences between O'Brien and Davis, it was delayed until after their other popular series, Maze Runner, finished its third movie. When asked about why Stiles left, O'Brien replied, "Because they didn't want me to talk!" He later added, "I'm not going to say anything else because I don't want to jinx anything." It's possible that Stiles will return in some form or another.