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The time is ticking as Scott tries to find out Gerard's master plan following a death on campus.
Scott has to pull double duty by playing in the championship lacrosse game and finding a way to stop Gerard.
While following Derek, Allison is lead back to the sheriff's station, where Stiles, Melissa, Scott, and the Sheriff are also being held hostage.
The wolves that Derek has turned get prepared to go through their first transformation together on a full moon, and Derek locks them up so that he can observe the group and keep them safe. Meanwhile, at the same time that his relationship with Allison gets even rockier, Scott must go to Lydia's birthday party with Stiles.moreless
With the new shape-shifter on the loose, Scott and Stiles try to devise a plan to trap it. Meanwhile, Mrs. Argent sets out to deal with Scott once and for all.
Lydia starts to make associations about being attacked and bitten by Peter Hale, while Derek doubts his leadership skills as an Alpha. Jackson creates problems for Stiles and Scott.
Scott and Stiles uncover new evidence about the shape-shifter. In the mean time, Allison is given an assignment by her family.
Derek is sure that Lydia is the shape-shifter, and asks Scott to help him find out. Meanwhile things develop with Jackson, as the bite begins to show promising effects. The shape-shifter could possibly be a woman.
The shape-shifter continues his murders while Scott tries to get Allison to retrieve a rare book in Gerard's collection
Allison officially begins her training while everyone continues to search for the new creature and its human identity. Scott endeavours to convince Derek to stop making new werewolves.
Isaac is incarcerated when his father is murdered. Locked up in jail on the night of the full moon, Scott, Stiles and Derek work together to try to break him out before he undergoes his first transformation into a werewolf.
Werewolves and hunters search for Lydia after she goes missing from the hospital.
A one hour summary of the first season.