Trapped in the hospital, Scott and the gang have to work with the Darach against the Alpha Pack.

As Allison begins to suspect someone dangerously close to her may be involved in the murders, Scott and Stiles conclude that Lydia's rising talents may be their best bet to solving the murders.

In the past, Derek Hale (age 15) runs through a foggy wood. He trips and falls in front of one of the hunters’ ultrasonic emitters, a device which broadcasts a high pitch designed to herd werewolves in a certain direction. More than a dozen hunters are in the woods with flashlights, guns and crossbows.

Scott's trusted mentor and boss is threatened. Deucalion, Kali, and the twins go after Derek.

Stranded at a motel for the night because of the postponed cross-country meet, Scott and the others suffer strange experiences that cause them to believe members of their own group may be the mysterious killer's newest targets.

A preemptive strike against the Alphas leaves several injured and possibly dead.

Scott tries to prevent a deadly confrontation. Stiles defends the Werewolves.

With Boyd and Cora on the loose and under the influence of the full moon, Scott and Derek must turn to an unlikely ally.

Allison and Lydia stumble upon a possible clue to finding Boyd and Erica, while a childhood friend of Stiles goes missing.

In the season premiere, a new Alpha Pack arrives to wreak havoc on Scott's life while Derek and Isaac search for Erica and Boyd.