Scott and his Pack begin a dangerous battle against an old enemy.

Scott and Stiles return to La Iglesia to save the Pack from Kate.

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.

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.

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

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

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