Theo made his highly-anticipated return on the Jan. 3 episode of 'Teen Wolf.' Even though he's not exactly on everyone's good side, he has information that can help the pack get Stiles back!

"Teen Wolf: The Movie" brings back plenty of stars from the TV show, but O'Brien is the only original main cast member who doesn't participate. Here's how the film handles Stiles being a no-show.

Ultimately, Stiles isn’t in the Teen Wolf movie as a result of events behind the scenes, not the original script. Stiles would have been a part of the movie if Dylan O’Brien had opted to sign on.

Doing so would, they hoped, open a portal to where Stiles and the rest of Beacon Hills' residents were sent after being taken by the Ghost Riders. Teen Wolf: 6 things we need from the final season ...