Beacon Hills faces a new supernatural threat in "Teen Wolf" Season 2, as a mysterious reptilian creature known as the Kanima emerges. Scott McCall, a teenage werewolf, strives to protect his friends and maintain his secret identity while navigating his complicated relationship with Allison Argent, a skilled hunter from a family dedicated to eradicating werewolves. Meanwhile, Derek Hale, a newly turned Alpha werewolf, attempts to build his own pack. Jackson Whittemore, Scott's rival, experiences a strange and painful transformation after being bitten by Derek, oozing black liquid and exhibiting unusual behavior.

The Kanima, a creature that paralyzes its victims and seeks a master, begins a series of murders. It is soon revealed that Jackson Whittemore is the Kanima, unknowingly controlled by Matt, a vengeful teenager. Matt uses the Kanima to exact revenge on those who wronged him in the past. After Matt is drowned by Gerard Argent, Allison's ruthless grandfather, Gerard seizes control of the Kanima, manipulating events to further his own sinister agenda. Gerard's true plan is to use the Kanima to force Derek into biting him, believing it will cure his cancer and grant him werewolf power.

Scott thwarts Gerard's plan by secretly replacing his cancer medication with mountain ash, causing Gerard's body to reject the bite. In a shocking turn of events, Jackson is seemingly killed by Derek and Peter Hale (Derek's resurrected uncle), but then revives as a blue-eyed werewolf, leaving everyone stunned by his unexpected transformation.

Season 2 of Teen Wolf covers episodes 1-12. Here's everything that happened:

Season 2, Episode 1: Omega - Scott and Allison defy her parents' orders and continue seeing each other. Lydia disappears from the hospital, prompting a search. Derek recruits werewolves, while Gerard Argent makes a brutal statement by bisecting a captured Omega. Jackson begins to suffer the effects of Derek's bite, oozing black liquid. The episode concludes with Isaac entering Derek's lair.

Season 2, Episode 2: Shape Shifted - Isaac's abusive father is killed by a mysterious lizard-like creature. Scott identifies Isaac as the new werewolf at lacrosse practice. Allison thwarts her family's attempt to murder Isaac. Scott locks himself in a freezer for the full moon. The episode concludes with Allison encountering the creature.

Season 2, Episode 3: Ice Pick - Allison's hunter training begins with a staged kidnapping. Derek recruits Erica, offering to cure her epilepsy. Lydia hallucinates Peter Hale under the ice. Bennett, Argent's protégé, is killed by the new shapeshifter. Jackson confronts Lydia, believing she blocked his transformation. Boyd accepts Derek's bite. The episode concludes with Boyd joining Derek's pack.

Season 2, Episode 4: Abomination - Scott and Allison search for the Argent bestiary while a new shapeshifter attacks, killing a mechanic. Stiles and Derek are trapped in a pool by the Kanima, but Scott saves them. Gerard reveals he knows Scott is a werewolf and threatens Scott's mother. The episode concludes with Scott bleeding from a stab wound inflicted by Gerard.

Season 2, Episode 5: Venomous - Derek suspects Lydia is the Kanima and tests Jackson with Kanima venom; Jackson is paralyzed, seemingly proving he isn't the Kanima. Erica and Isaac attempt to poison Lydia with the venom during class, but she is unaffected. Scott, Allison, and Stiles protect Lydia at Scott's house, where Jackson transforms into the Kanima and escapes.

Season 2, Episode 6: Frenemy - Scott and Stiles discover Jackson's video, revealing his Kanima transformation. Derek and Argent's fight with the Kanima at a parking lot ends with the Kanima attacking Argent. At a gay club, the Kanima paralyzes Danny and others before Derek intervenes. Scott and Stiles capture Jackson, but he escapes custody after learning he's the Kanima. Lydia translates the bestiary, revealing the Kanima seeks a master, not a friend.

Season 2, Episode 7: Restraint - Jackson's restraining order impacts Scott and Stiles. Jackson attacks Allison, leading to a detention where he leaves a threatening message. Erica suffers a seizure due to the Kanima's venom. Lydia, lured to an empty house, kisses a vision of her dead ex-boyfriend, which then transforms into Peter Hale, who reveals Lydia is his "plan B". The episode concludes with Erica being taken to Derek for help.

Season 2, Episode 8: Raving - Scott and Stiles plan to trap the Kanima at a rave. Allison's mom plots against Scott. Stiles and his father discover the victims were all in the same class of 2006. Jackson, controlled by his master, kills another victim. Derek saves Scott from Victoria, but bites her in the process. The episode concludes with Ms. Morrell meeting with Dr. Deaton, hinting at future events.

Season 2, Episode 9: Party Guessed - Lydia throws a party where she spikes the punch, causing hallucinations. Victoria Argent commits suicide with Chris's help. Derek struggles to control his newly turned betas during the full moon. Matt is revealed to be the Kanima's master. Peter Hale is resurrected by Lydia.

Season 2, Episode 10: Fury - Matt is revealed as controlling the Kanima, using it for revenge on the 2006 swim team. He takes hostages at the sheriff's station, killing several deputies. Scott's mom learns he's a werewolf. Gerard drowns Matt, becoming the Kanima's new master.

Season 2, Episode 11: Battlefield - Gerard threatens to have Jackson kill someone if Scott doesn't hand over Derek. Allison hunts Boyd and Erica, leading to Chris Argent stopping her violent behavior. Stiles helps win the lacrosse game, but Jackson commits suicide. In response, Gerard kidnaps Stiles, while Scott finds his mother threatened by the Kanima.

Season 2, Episode 12: Master Plan - Gerard kidnaps Stiles, while Scott and Chris try to save Jackson. Scott discovers Gerard's plan to become a werewolf to cure his cancer, swapping his pills with mountain ash. Lydia returns Jackson's key, triggering his transformation; Derek and Peter then kill Jackson. However, Jackson revives as a blue-eyed werewolf, leaving everyone shocked.