The series revolves around social outcast Scott McCall, a high school student living in the town of Beacon Hills. Scott's life drastically changes when he is bitten by a werewolf, becoming one himself. He must henceforth learn to balance his problematic new identity with his day-to-day teenage life. The following characters are instrumental to his struggle: Stiles, his best friend; Allison, his love interest who comes from a family of werewolf hunters; and Derek, a mysterious werewolf with a dark past. Throughout the series, he strives to keep his loved ones safe while maintaining normal relationships with them.
Derek and Isaac search for Erica and Boyd, and a new wolf pack arrives in town with its own menacing Alpha.
One of Stiles' childhood friends goes missing, Scott begins his new fight against the Alpha pack, Lydia and Allison investigate a new mystery, the alpha pack reaches out to Peter and the werewolf hunters begin to recruit after the alpha pack kills one of their own.
Boyd and Cora are under the influence of the full moon; Scott and Derek seek help from an unlikely ally.
Scott tries to keep Isaac from confronting the twins in school; Stiles tries to prove his theory about the killings.
During a bus ride to a cross-country meet, Scott and his friends flash back to the events of a pre-emptive strike against the Alphas, which has left several injured and possibly one or more dead.
Scott and the others suffer strange experiences while stranded at a motel; considering the killer's newest targets.
The Darach targets Deaton as the next sacrifice, leaving him hanging by his wrists to die. Kali and the twins go after Derek.
While looking for answers, Scott, Allison and Stiles hear stories told by two unlikely narrators and discover a secret about the color of a werewolf's eyes.
Allison suspects that someone close to her is involved with the murders; Scott and Stiles want to use Lydia's talents to solve the murders.
Trapped by a storm in a hospital, Scott and Derek must defend themselves against the Alphas; saving Cora's life.
Scott must make a difficult choice to save friends and family; Derek and Peter contemplate a way to save Cora's life.
Scott and his friends use an ancient ritual to save the lives of their loved ones and stop Deucalion.
Scott, Stiles and Allison suffer side effects from the ritual sacrifice; Sheriff Stilinski searches through old cases.
Scott and his friends ponder catching the werecoyote before it is hunted down; an unlikely ally helps Derek and Peter break out.
William Barrow, an electrical engineer turned mass murderer, escapes during surgery and hides out in the school.
Beacon Hills is under curfew from the power outage; the teens throw a blacklight Halloween party; Scott tries to earn Kira's trust.
Scott's friends pledge to protect him; Argent, Isaac and Allison search for answers;Stiles may be the dark spirit the oni seek.
Stiles goes missing; Scott and the others set off on a search; Lydia tries to master her new abilities.
Scott and the others try to prevent a disaster; Lydia and Allison seek out an unlikely teacher. Stiles is still possessed by the nogitsune.
Stiles has to make an important decision over Eichen house. Scott and his friends seek out an important Japanese artifact.
An important clue is revealed in the story of a World War II internment camp; Kira's role is more crucial, and she discovers unusual abilities.
Scott and Lydia combine abilities in an attempt to gain the upper hand; Stillinski's future will be decided by a review board.
Kira finds herself facing an unexpected antagonist; Scott and his friends try to survive against an enemy growing ever stronger.