The night before the new full moon, Isaac's father is murdered. When he's taken into custody, Scott, Stiles and Derek resolve to break him out before the Argents get to him first and before the newly bitten teen turns into a werewolf.
When Lydia goes missing from the hospital, werewolves and hunters alike begin a search to discover not only where she is, but what she's become.
Caught in the middle of a war between hunters and werewolves, Scott discovers one last clue which allows him to enlist both friends and even a previous enemy in order to stop the mysterious killings and win back Allison, the girl he loves.
While struggling with her family's secrets, Allison turns her focus to Scott and a Winter Formal dance. As the tensions between werewolves and hunters rise to a boiling point, Scott struggles to protect both friends and enemies while keeping his secret safe from Allison.
With startling revelations weighing 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. Meanwhile, Stiles begins to close in on the mystery behind Derek's family.
Clues, including a prior encounter with Derek, bring Jackson to a dangerous revelation about Scott. His actions begin to threaten not only Scott's life but his own, while Allison starts to question the strange behavior in her own family.
The break-up between Allison and Scott impacts them both, making them feel depressed. While Jackson offers a helping hand to Allison, Scott is dealing with the upcoming full moon. Scott behaves very differently and puts his friendship with Stiles in jeopardy. Derek's return helps Scott in not making a huge decision which would have jeopardized many.
Scott, Stiles, Allison, Jackson and Lydia are all trapped in the high school, due to the fact that the alpha is on the search for Scott to join his pack. Scott volunteers to go on the run to get something that will help them escape, but consequences follow him when he leaves.
Scott and Stiles come up with ways for him to control the transformation in order to be with Allison. 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 that both sides are tracking.
A new animal attack involving Lydia and Jackson raises more questions among authorities about wild animals. While Scott and Allison skip school and take off unannounced, Derek must deal with the ever more aggressive werewolf hunters on his own.
A new hunter in town puts Derek's life in danger, forcing him to make reluctant allies out of Scott and Stiles. While Scott tries to survive dinner with Allison and her father, Stiles attempts to keep a mortally wounded Derek alive.
Scott's first date with Allison ends up in the confusion of the dreaded "group date" with Lydia and Jackson in tow; meanwhile, a mysterious animal attack has Stiles's father, Sheriff Stilinski, on the lookout.
Now aware that he's become a werewolf, Scott must deal with 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 and get a second chance at a date with Allison.
When 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. As strange abilities begin to take affect the next day, Scott meets the beautiful new girl in town, Allison, whose family secrets further complicates his life.
