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.
Scott and Stiles come up with ways for him to control the transformation in order to be with Allison, while Derek continues trying to make an ally of Scott in both his battle with the hunters and in his goal to find a mysterious figure both sides are tracking.
When Derek is savagely attacked by the Alpha, Scott, Stiles and their friends find themselves trapped in Beacon Hills High School at night, where they face both questions and suspicions about each other.
With Derek on the run from Sheriff Stilinski and his department, Stiles must help Scott face his second full moon as a werewolf.
Clues, including a prior encounter with Derek, bring Jackson to a dangerous revelation about Scott.
With startling revelations weighing in on him, Scott finds himself scrambling to protect the people he loves, including Allison who begins to follow clues left by her Aunt Kate about her family history.
While struggling with her family's secrets, Allison turns her focus to Scott and the Winter Formal dance.
Scott McCall, caught in the middle of a war between hunters and werewolves, discovers one last clue which allows him to enlist both friends and even a previous enemy in order to stop the mysterious killings in Beacon Hills and win back Allison.