Later on Kate transforms Scott into a new Berserker, putting the werewolf under her control, to use him against his friends. Scott is able to fight off the animal spirit, overcoming the Berserker conversion.

How does Scott come back from being a Berserker?

Scott's first real beta wolf saved his life by telling Scott that he was not a monster. He is a werewolf, just like him. That, and not the pleas from best friend Stiles or girlfriend Kira, snapped Scott out of the berserker shell and turned him back into his strong, true alpha form.

Does Scott McCall become a Berserker?

Scott McCall

Scott awakened on a stone table, where he was strapped down and covered in wolfsbane, weakening him enough for Kate to perform the ritual to turn him into a Berserker by placing a bear skull over his face and outfitting him in clothes made of bear pelts.