Mike Hooks was a 19 years old college student who became possessed after he put on a bunny mask. Under possession, Mike murdered Stan Hinkle, for which he was arrested. However, the mask would not come off. Sheriff Donna Hanscum called in Sam and Dean Winchester to investigate, and a tattoo on Mike's arm led them to his girlfriend, Kylie Jennings, who revealed to them who Mike was and that Stan was a complete stranger.
Meanwhile, the possessed Mike gained an opportunity to attack Donna, forcing Deputy Sheriff Doug Stover to shoot him dead. The bloodied mask came off, revealing Mike's face. His death left a rather profound effect on Donna.