The secret behind Derek's tattoo is revealed and the Alpha pack make their presence known. Derek and Isaac struggle to locate Erica and Boyd.
Scott begins his new fight against the Alpha pack, Allison and Lydia locate a possible clue to finding Boyd and Erica; one of Stiles' childhood friends goes missing, the alpha pack reaches out to Peter and the werewolf hunters begin to recruit after the alpha pack kills one of their own.
With Boyd and Cora on the loose and under the influence of the full moon, Scott and Derek must turn to an unlikely ally for help.
While Scott tries to keep Isaac from engaging in a deadly confrontation with the Twins in school, Stiles attempts to prove his theory that the killings have nothing to do with werewolves.
During a bus ride to a cross country meet, Scott and his friends flash back to the events of a preemptive strike against the Alphas that has left several injured and possibly one or more dead.
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 the mysterious hugger's newest targets.
As the danger begins to reach closer to Scott, threatening his trusted mentor and boss, Deaton, Kali and the Twins go after Derek.
Seeking answers, Scott, Allison and Stiles hear stories told by two unlikely narrators and discover a secret about the color of a werewolf's eyes.
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.
Trapped inside an evacuated Beacon Hills hospital by a powerful storm, Scott and Derek must defend themselves against the Alphas while trying to figure out how to save Cora's life.
With the threat growing far more personal and time running out on innocent lives, Scott is forced to make a difficult choice in order to save both friends and family while, at the same time, Derek and Peter try to figure out how to save Cora's life.
Under Deaton's advice, Scott and his friends use an ancient but extremely dangerous ritual to help them both save the lives of the people they love and stop Deucalion from achieving his sinister goal.
Scott, Stiles and Allison suffer side effects from the ritual sacrifice; Sheriff Stilinski searches through old cases.
Scott and his friends ponder catching the werecoyote before it is hunted down; an unlikely ally helps Derek and Peter break out.
When a convicted hug escapes prior to a surgery, Scott and his friends try to help his target.
Beacon Hills is under curfew from the power outage; the teens throw a blacklight Halloween party; Scott tries to earn Kira's trust.
Scott's friends pledge to protect him against an increasingly hostile enemy while Argent, Isaac and Allison search for answers through an old adversary from the Japanese Yakuza. At the same time, Stiles enlists Melissa's help in figuring out exactly what's going on with him.
Stiles goes missing; Scott and the others set off on a search; Lydia tries to master her new abilities.
Signs of sabotage appearing all around them, Scott and his allies desperately try to figure out how to prevent disaster as Lydia and Allison seek an unlikely teacher to focus her power.
Scott and the others seek an important artifact; Stiles must make a decision about Eichen House.
An important clue is revealed in the story of a World War II internment camp; Kira's role is more crucial, and she discovers unusual abilities.
With Deaton and Peter's help, Scott and Lydia combine their abilities in a desperate attempt to gain the upper hand. At the same time, Stilinski faces a review board that may decide his future.
Kira faces an unexpected enemy.
Struck by disaster and nearly defeated, Scott and Derek call on their friends and allies to make one last stand.