Scott McCall (Tyler Posey) and Allison Argent (Crystal Reed) conceal their renewed relationship from Allison's opposing parents. Lydia suffers chronic hallucinations since bitten by Peter Hale (Ian Bohen). New Alpha werewolf, Derek Hale (Tyler Hoechlin), recruits abused teen Isaac Lahey (Daniel Sharman) into his pack. Jackson Whittemore (Colton Haynes) shows signs of immunity to Derek's bite, leaving the reason a mystery. As Allison's heartless grandfather Gerard Argent (Michael Hogan) comes to town for his daughter Kate Argent's (Jill Wagner) funeral, he avenges her death, declaring war against all werewolves, innocent or not.
Isaac discovers his abusive father was killed by a strange creature. Gerard replaces the Beacon Hills High principal and Allison's mother Victoria Argent (Eaddy Mays) becomes a substitute teacher, all to keep close watch over Allison. Lydia's hallucinations center on a mysterious young boy at the school. Derek recruits an epileptic loner, Erica Reyes (Gage Golightly) and a lonely Boyd (Sinqua Walls), to his pack. He discovers the unknown creature is a Kanima, a creature created by a mutation in lycanthropy.
Jackson is revealed to be the Kanima, controlled by its master. The Kanima seeks vengeance as a servitude to its master, targeting victims on orders. Lydia discovers that the Mysterious Young Boy (Michael Fjordbak) she hallucinated does not exist and is actually a younger Peter Hale. Peter uses her to lure Derek to him at the old Hale house in order to become resurrected. To save Scott from danger after Victoria learns Scott and Allison are still together, Derek ends up biting Victoria, who commits suicide before she turns into a werewolf. Gerard manipulates Allison's grief over her dead mother, as he blames Derek, making Allison behave like a ruthless hunter.
The Kanima's master is revealed to be Matt Daehler (Stephen Lunsford), a school student who is friends with Jackson. He holds a grudge against the Kanima's selected victims, who left him, with no swimming ability, to nearly drown years ago at a swim team pool party held by Isaac's swim coach father. The Kanima is revealed to also fear water because of their connection. Held by Matt at a local police station, Scott, Stiles, their parents and Derek are able to escape, although Scott transforms for the first time in front of his mother, Melissa McCall (Melissa Ponzio), and leaves her horrified.
Gerard becomes the Kanima's new master, drowning and killing Matt. Gerard wants Scott to help him become the mole in Derek's pack, threatening to kill those close to him. Fearing for their safety, Boyd and Erica part ways with Derek, as Derek learns the Kanima's weakness is its human form love interest, Lydia, who can connect with Jackson. When Jackson is hospitalized and developing to a new stage of the Kanima, he falls into the hands of Scott's nurse mother and later Scott and his allies. The hunters also kidnap and punish Stiles, Erica and Boyd, but they are set free afterwards. Realizing Gerard corrupted his daughter, Allison, with his ways, Chris Argent (JR Bourne) helps Scott and his allies to stop the Kanima from evolving.
Gerard confronts them, wanting the bite from Derek to cure his cancer, threatening to make the Kanima kill his granddaughter and Scott's lover, Allison, if not. It also runs the risk where if Gerard kills Derek afterwards, he becomes the Alpha werewolf. Once bitten, it's revealed Scott had switched Gerard's cancer medication with Mountin Ash (a supernatural repellent) causing Gerard to violently reject the bite. Before the Kanima can kill anyone, Lydia reaches out to Jackson, who evolves into a new werewolf just as Gerard disappears. Feeling guilty over her heartless grandfather, Allison breaks up with Scott. Erica and Boyd come across a new Alpha pack advancing on them and Peter instinctively informs Isaac of the Alpha pack's presence.
Dr. Deaton (Seth Gilliam), Adrian Harris (Adam Fristoe), Coach Bobby Finstock (Orny Adams), Sheriff Stilinski (Linden Ashby), Danny Mahealani (Keahu Kahuanui), Marin Morrell (Bianca Lawson) and Mr. Lahey (John Wesley Shipp) also appear during the season.
Kali, Ennis, Ethan and Aiden make a cameo at the end of Master Plan as the members of The Alpha Pack that kidnapped Boyd and Erica and will become recurring characters during Season 3, while their leader Deucalion is introduced in Tattoo, they would later be played by Gideon Emery (Deucalion), Brian Patrick Wade (Ennis), Felisha Terrell (Kali), Charlie Carver (Ethan) and Max Carver (Aiden).

Teen Wolf Season 2 Complete 480p WEB-DL x264 MKV - amaanu01