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Sam follows him and sees him talk to another man in a park. When he approaches, though, the man smells him, turns back into Lucky, and tries to run. Before Sam can catch up to him, Lucky is hit by a car and the driver loads him into the back to take him to an animal shelter. Sam, based on information from [[Bobby]], calls Dean and tells him that they are dealing with a [[skinwalker]] posing as a dog.
Sam and Dean take [[Lucky]] from the animal shelter and bind him in rope and [[silver]] chains to restrain him. It transpires that the man was homeless when he was approached and recruited to become a skinwalker--he was told that being bitten would make him strong and fast. Lucky reveals that there are about thirty skinwalkers who have been recruited and are living with families as pets. On a signal from their pack leader, they will infect their families, thus recruiting more skinwalkers. He tells Sam and Dean that there are packs in many other towns, but he knows nothing of the
[[Alpha Skinwalker ]].
Lucky leads Sam and Dean to the Pack Leader, but he has kidnapped [[Mandy]] and her son, Aiden, and threatens to kill them unless [[Lucky]] turns them. Sam and Dean open fire, and all the skinwalkers are killed except for Lucky, who, although shot with a [[silver]] bullet, escapes.