When teenager Scott McCall is convinced by his best friend, Stiles, to join a search in the woods for a missing body, something comes out of the darkness to take a bite out of his side.

Not aware that he has become a werewolf, Scott must deal with both hunters trying to catch him, another werewolf named Derek Hale and the pressure of normal teen life, all while trying to figure out how to play his first lacrosse game.

Scott's first date with Allison ends up in confusion and turns into a dreaded "group date" with Lydia and Jackson in tow.

The arrival of a surprising new hunter in town puts Derek's life in danger, forcing him to make reluctant allies out of Scott and Stiles.

A new animal attack involving Lydia and Jackson raises more questions among authorities about wild animals.