MTV's hit series Teen Wolf is getting more intense than ever, as Scott (Tyler Posey) tries to save his best friend Stiles (Dylan O'Brien) from an evil spirit that's possessing him.
In Monday's episode, an important clue to defeating their enemy is revealed through the story of a World War II Japanese-American internment camp, while Kira (Arden Cho) becomes ever more crucial as she begins to realize her own unusual abilities.
But will Scott actually have to kill Stiles to save him?
Check out the clip above to preview Scott's agonizing choice.
Teen Wolf airs Monday, March 3, at 10 p.m. on MTV.