Scott McCall, a high school student, is bitten by a werewolf and begins to develop supernatural abilities. He struggles to control his transformations, especially while pursuing a relationship with Allison Argent, whose family secretly hunts werewolves. Scott's best friend, Stiles Stilinski, helps him navigate this new reality, while Derek Hale, a mysterious werewolf, trains Scott and warns him about a dangerous Alpha werewolf in town.

The central conflict revolves around Scott's fight to control his werewolf nature and protect his loved ones from the Alpha, who is revealed to be Peter Hale. Key turning points include Scott learning his anger triggers transformations, Derek being shot with a wolfsbane bullet, and the Alpha murdering several people to maintain secrecy. Allison discovers her family's dark history as werewolf hunters, and Lydia is bitten by Peter, becoming a werewolf herself.

The season culminates with Scott and Derek teaming up against Peter. Kate Argent is killed by Peter, and Derek then murders Peter, becoming the new Alpha. In a shocking twist, Derek bites Jackson, turning him into a werewolf.

Season 1 of Teen Wolf covers episodes 1-12. Here's everything that happened:

Season 1, Episode 1: Wolf Moon - Scott gets bitten by a werewolf while searching for a dead body with Stiles. He develops enhanced abilities and makes the lacrosse team. Scott pursues Allison, but during a date, he begins to transform. The episode concludes with Scott realizing Allison's father is a werewolf hunter and that Derek is the werewolf who bit him.

Season 1, Episode 2: Second Chance at First Line - Scott struggles with his werewolf abilities while trying to play lacrosse and win Allison over. He attacks Stiles in the locker room, learning anger triggers his transformations. Scott and Stiles find Laura Hale's body, leading to Derek's arrest. Scott and Allison share their first kiss after the lacrosse game.

Season 1, Episode 3: Pack Mentality - Scott dreams of attacking Allison, which mirrors an actual attack on a bus driver. Scott and Allison go on a group date where Scott uses his werewolf abilities to win at bowling. Derek reveals he didn't bite Scott and that another Alpha werewolf is in town. The episode ends with Derek killing the bus driver in the hospital to keep him quiet.

Season 1, Episode 4: Magic Bullet - Kate Argent arrives and is attacked by the Alpha, but she shoots Derek with a wolfsbane-laced bullet. Scott attends a tense dinner at the Argents to steal a bullet to save Derek. He succeeds, and Derek cauterizes the wound, but Allison grows suspicious of her family.

Season 1, Episode 5: The Tell - Jackson finds a body at a video store, and Lydia witnesses the Alpha. Kate gives Allison a family heirloom. Scott and Allison skip school, missing parent-teacher conferences. Kate tortures Derek, seeking the Alpha's identity. A mountain lion is shot in the school parking lot.

Season 1, Episode 6: Heart Monitor - Scott struggles to control his werewolf transformations with Stiles's help, using a heart monitor. Derek trains Scott but tells him to stay away from Allison. The Alpha draws a spiral on Scott's car, a sign of revenge. Derek confronts the veterinarian, believing him to be the Alpha, but the Alpha attacks Derek. Scott and Stiles barricade themselves in the school.

Season 1, Episode 7: Night School - Scott and Stiles are trapped at school with the Alpha, who murders the janitor. Allison, Lydia, and Jackson arrive, lured by a fake text. The group hides in a classroom, and Scott retrieves keys from the janitor's body, triggering a forced werewolf transformation. Allison breaks up with Scott, citing trust issues.

Season 1, Episode 8: Lunatic - Scott's werewolf senses heighten with the full moon approaching, making him aggressive. Stiles locks Scott up, but he escapes and nearly attacks Allison and Jackson. Derek returns and subdues Scott. Derek tells Scott the only possible cure is to kill the Alpha. Jackson finds a claw on his car, realizing Scott is the werewolf.

Season 1, Episode 9: Wolf's Bane - Scott, Stiles, and Derek seek the Alpha, while Jackson pressures Scott to turn him. Derek and Stiles discover the ominous text to Allison originated from the hospital. The Alpha is revealed to be Peter Hale, who attacks Derek. Allison's family suspects Jackson is a Beta. The episode concludes with Scott preparing for his lacrosse game.

Season 1, Episode 10: Co-Captain - Scott juggles protecting Allison, dealing with the Alpha's threats, and preventing him from turning his mother. Derek, under the Alpha's control, targets Jackson, but Scott intervenes. Allison learns about her family's werewolf hunting history, while Derek is captured by the Argents. Scott is saved by Deaton, the vet.

Season 1, Episode 11: Formality - Kate tortures Derek to find the Alpha, revealing werewolves to Allison. Scott, banned from the formal, sneaks in to protect Allison, rekindling their romance. Lydia is bitten by Peter, and Jackson informs the Argent's about Scott. Scott transforms into a werewolf in front of Allison.

Season 1, Episode 12: Code Breaker - Scott and Derek team up against the Alpha, who forces Stiles to help him. Kate is killed by Peter after she apologizes insincerely for the Hale fire. Derek then murders Peter, becoming the new Alpha. Finally, Derek bites Jackson.