Teen Wolf

On the night before the start of Senior Year, Scott and his Pack are challenged by the arrival of a new enemy and the return of an old friend.

Scott investigates a talon his attacker left behind for clues, Stiles is suspicious of Theo, and Tracy's night terrors overtake her daily life.

When Tracy shows up at school after a series of tragedies, Scott, Stiles and Malia take her to Deaton for a medical evaluation, where her true form is revealed.

Lydia undergoes surgery, Deaton is rattled by his findings, and Liam and Mason's night out poses a threat to the pack.

When the pack goes to Eichen House to learn more about the Dread Doctors, Kira's power weakens the security system, putting them all in danger.

Sheriff Stilinski suspects new chimeras have emerged after discovering holes in the lacrosse field, Liam tries to pay Hayden back, and Scott, Stiles and Lydia are triggered by Valack's book.

Kira fights for control over her soul, the pack makes a plan to trap a Dread Doctor at the high school, and Stiles and Theo investigate who's been stealing the chimeras.

The group tries to rescue Liam and Hayden, Kira finally cracks the book's code, and Stiles finds out who's been removing the bodies from the vet clinic.

Scott struggles with the return of his asthma, Theo stirs things up between Scott and Stiles, and Lydia helps Parrish locate the stolen chimeras.

As the supermoon approaches, Lydia discovers Parrish's secret, Theo reveals his master plan, and Liam lashes out at Scott while Hayden's condition worsens.

The pack goes on the hunt for what -- or who -- is responsible for putting Stilinski in the hospital, Lydia winds up at Eichen House, and Parrish finally unleashes the Hellhound.

Scott and Stiles reunite to defeat a new monster terrorizing Beacon Hills, Lydia fights to regain consciousness, and Theo makes a surprising offer.

Kira is confronted by the Skinwalkers as Scott and Stiles head to New Mexico to find her, and Liam and Mason make a big discovery.

Lydia learns how to harness her power while trapped in Eichen House, Malia finds the Desert Wolf holding Deaton hostage, and Gerard and Chris help Parrish understand his true nature.

Parrish tries to stop the Beast from terrorizing Beacon Hills, and the pack heads to Eichen House to rescue Lydia, unaware that Theo and his pack have a similar plan.

Meredith gives Scott a clue about how to save Lydia, Dr. Valack pressures Lydia to wear the Dread Doctor mask in order to identify the Beast, and Parrish arrives in the nick of time.

The pack tries to stall the lacrosse game in the hopes of finding the true identity of the Beast, Gerard has Lydia question the Hellhound about Parrish, and the Desert Wolf confronts Malia.

Chris and Gerard try to inspire confidence in Lydia with the story of Marie-Jeanne Valet, while the rest of the pack battle the Beast and finally uncover its human identity.

Scott, Liam and Theo try to rescue Mason -- each for different reasons -- while Malia and Braedon are tracked down by the Desert Wolf, and Kira makes a plea for help to unlikely allies.

With Sebastien on the loose looking for the Surgeon's cane, Scott, Stiles and Liam are in a race against time to release Mason from the Beast before it's too late.