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

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

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

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

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 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.

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

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.

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

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

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

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 graduation approaching, a supernatural force rides into Beacon Hills and crosses paths with Scott and his friends, while Liam discovers evidence of a new enemy in the high school.