The second season of Teen Wolf, an American supernatural drama created by Jeff Davis based upon the 1985 film of the same name, premiered on June 3, 2012, and concluded on August 13, 2012, on the MTV network.

Derek recruits epileptic loner Erica Reyes (Gage Golightly) and a lonely Boyd (Sinqua Walls) to his pack.

Derek discovers the unknown creature who killed Isaac's father is a Kanima, a lizard-like shape shifter created by a mutation in lycanthropy.

Realizing his father, Gerard, corrupted his daughter Allison, Chris Argent (JR Bourne) helps Scott and his allies stop the Kanima from evolving.

Gerard tries to confront the group by forcing Derek to bite him and cure his cancer, but Scott reveals he switched his medication with mountain ash.

Kali, Ennis, Ethan and Aiden make a brief appearance in the season finale, "Master Plan", as the members of the Alpha Pack that kidnapped Boyd and Erica.

[15] Michael Hogan has been cast as Allison's grandfather, Gerard, a lethal werewolf hunter who attempts to convince her to join the family business and aims to avenge his daughter's murder by killing all werewolves.

Daniel Sharman has been cast as Isaac Lahey, a troubled teen and member of the lacrosse team who is the first to join Derek's pack.

The website's critics consensus reads, "This lupine romp gains swagger in its sophomore outing, nailing an addictive mix of soapy melodrama and horror thrills.