On the eve of senior year, Scott and his pack deal with the arrival of a new enemy and the return of an old friend.

Upon learning that Lydia is in danger, Stiles makes a plan to break her out of Eichen House; Theo has his own plans.

Scott tracks a new shapeshifter that's threatening Stilinski; and Malia receives information about her mother.

In hopes of learning more about the Dread Doctors, the pack goes into Eichen House.

Stiles is suspicious of a new classmate; and Lydia helps a student with night terrors.

While trapped in Eichen House with Theo and the Chimera pack, Scott tries to rescue Lydia before time runs out.

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 both lives and friendships on the verge of being destroyed, Scott and his pack face their greatest enemy yet.

Scott and Stiles try to learn what is behind the mysterious infection that is killing the town sheriff.

Scott and his pack use a charity lacrosse game in a deadly gambit to figure out the identity of the Beast.

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 finds himself turning to an unlikely ally for help. Stiles and Lydia attempt to find out the truth about Parrish.

As Scott tries to put his pack back together, Malia and her new ally set out to rescue Deaton from The Desert Wolf.

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.

Stiles works on tracking down a fugitive; Liam tries to be Mason's wingman at a nightclub.

Even without the support of his pack, Scott considers what the Dread Doctors' success means for Beacon Hills.

After following Dr. Valack's advice, Scott and the others begin to experience strange things.

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.

Kira and her mother make a journey to help Kira deal with her dark side; Lydia is surprised at Eichen House.

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.