When Scott suffers a werewolf bite, his strange new abilities begin to complicate his life - and his relationship with the new girl in town.

A new hunter comes to town and shoots Derek, who is certain to die unless Scott can find the right kind of bullet that caused his injury.

There's another animal attack involving Lydia and Jackson, raising more questions about wild animals. Meanwhile, Scott and Allison skip school and Derek must deal with the werewolf hunters on his own.

The hunt is on for Derek's whereabouts, meanwhile Stiles tries to help Scott with controlling his transformation when a second full moon is approaching.

Caught in a war between hunters and werewolves, Scott seeks help from friends and enemies.

When Lydia goes missing from the hospital, werewolves and hunters begin a search.

Isaac's father is murdered; Scott, Stiles and Derek plan a break-out. At the same time, the Argent family remove the principal and Allison's grandfather replaces him. Scott senses that another werewolf is in the lacrosse locker room and plans to sniff them out, literally.

Scott tries to keep Derek from creating new werewolves; Argent officially begins Allison's training; the new creature in town takes another victim.

When the new shapeshifter strikes again, Scott has to recruit a reluctant Allison to acquire a rare book in Gerard's collection, while also once again surviving dinner with her family.

With startling new information about the shapeshifter, Scott and Stiles hurry to protect their friends while Allison is given an investigative task by her family.

As Lydia begins to make connections about the bite from Peter, Jackson causes new problems for Scott and Stiles while Derek has a crisis of faith in his leadership as a new Alpha.

During a secret concert, Scott and Stiles come up with a method to trap the new shapeshifter. At the same time, Allison's mother comes up with a plan of her own to take care of Scott once and for all.

Even as his relationship with Allison becomes further strained, Scott and Stiles must attend Lydia's birthday party while Derek locks his new wolves up to watch after them on their first full moon together.

Scott, Stiles, Melissa and Stillinski are taken hostage; Allison tracks Derek to the station.

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.

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.