Loyalties are tested and new alliances forged as Scott and his friends work to stop the Beast before Beacon Hills is razed to the ground.
With the identity of the Beast finally revealed, Scott and his friends are in a race against time to stop The Dread doctors from implementing their final plan.
Scott, Stiles, Lydia, Malia, and Liam are trying to figure out how to defeat the Beast of Gévaudan that the Maid of Gévaudan, Marie-Jeanne Valet, faced in 1765. As Gerard Argent, recounts Valet’s story to Scott’s pack in hopes they can deduce the creature’s weaknesses.
Scott and the pack use a charity lacrosse game in a ploy to learn the identity of the Beast.
While trapped in Eichen House with Theo and the Chimera pack, Scott tries to rescue Lydia before time runs out.
Upon learning that Lydia is in danger, Stiles makes a plan to break her out of Eichen House; Theo has his own plans.
As Scott tries to put his pack back together. Meanwhile, Malia and a new ally set out to rescue Deaton from The Desert Wolf.
Kira and her mother make a journey to help Kira deal with her dark side. Meanwhile, Lydia is surprised at Eichen House.
Even without the support of his pack, Scott considers what the Dread Doctors' success means for Beacon Hills.
Scott and Stiles try to learn what is behind the mysterious infection that is killing the town sheriff.
Scott and his friends have to deal with what could be their biggest threat yet.
Scott finds himself turning to an unlikely ally for help. Stiles and Lydia attempt to find out the truth about Parrish.
Scott and Malia get help to try to find Hayden and Liam. Deaton discovers something horrific about the dread doctors. Hayden and Liam will be faced with a life and death situation.
Stiles is suspicious about a new girl showing up and what her intentions are. Scott's plans to protect the newest victim are derailed when The Dread Doctors attack.
Scott and his friends experience strange effects after following Dr. Valack’s advice.
In hopes of learning more about the Dread Doctors, the pack goes into Eichen House.
Stiles tries to track down a fugitive. Liam tries to play wingman to Mason at a nightclub.
Scott tracks a dangerous new shapeshifter threatening Stilinski. Malia receives information about her mother's identity.
Stiles tries to prove his suspicions about a new classmate while Lydia helps a student with night terrors.
It's the eve of senior year and Scott and his pack deal with the arrival of a new enemy and the return of an old friend.
