Scott searches for a missing friend in Mexico in the Season 4 premiere.
Scott turns to an unlikely ally in order to stop Kate.
Scott's position on the lacrosse team is threatened. Meanwhile, Stilinski investigates a murder.
Uninvited guests arrive at Lydia's lake house. Meanwhile, Derek tracks down a killer.
Lydia seeks help with her powers; Scott, Stiles and Kira play in their first lacrosse game.
Scott is forced to help a dangerous enemy. Meanwhile, Derek and Malia track down an old ally.
A mysterious outbreak hits the high school.
Scott carries out a dangerous plan. Meanwhile, Malia confronts her past.
An assassin targets Scott and Liam at the lacrosse team's annual bonfire. Later, Lydia uncovers a family secret.
Scott and Kira protect Satomi's pack from assassins. Meanhwile, Stiles and Malia discover the origins of the Dead Pool.
Scott battles an old enemy.
Scott and Stiles save the pack from Kate in the Season 4 finale.