Crowley forces Dean and Sam to bring him an alpha monster. They go after a skinwalker, who plans to infiltrate his people into homes disguised as dogs and then have them all bite and transform their owners, creating a growing army.
Crowley bosses Dean and Sam and sends them to Buffalo, New York, to capture an Alpha werewolf that is killing people. Crowley would return Sam's soul if they succeed and bring the Alpha to him. Soon they discover that the killer is actually a skinwalker posing as the family dog Lucky that loves his owners Mandy and her son. He kills those that threaten the family to protect them. Dean and Sam catch Lucky and they discover that there are thirty skinwalkers living as family dogs and ready to transform their families into an army of skinwalkers. Now Dean and Sam want to destroy the pack and the Alpha.—Claudio Carvalho, Rio de Janeiro, Brazil
Dean and Sam investigate what seems to be a werewolf killing but turns out to be a skinwalker posing as a family dog who is taking revenge on his owner's enemies. After capturing the dog, he turns human and tells Sam and Dean that an Alpha skinwalker has created many sleeper cells that will rise on his command and kill their families. The only way to stop the mass murders is to find and kill the Alpha.—CW Publicity