What's New : Teen Wolf: Gerard Argent Is Back in This Terrifying New Trailer

Scott (Tyler Posey) and his pack - once he reassembles it - will be battling The Beast when MTV's Teen Wolf returns to finish off Season 5 on Jan. 5.

According to the new trailer, the Beast is so terrifying that it will force Scott to have to work with Theo (Cody Christian) if he wants to keep