Between the events of 'Saw' and 'Saw II', a sick and desperate John Kramer travels to Mexico for a risky and experimental medical procedure in hopes of a miracle cure for his cancer, only to discover the entire operation is a scam to defraud the most vulnerable. Armed with a newfound purpose, the infamous serial killer returns to his work, turning the tables on the con artists in his signature visceral way through devious, deranged, and ingenious traps.
Wilby Daniels, a successful lawyer running for District Attorney, suddenly finds himself being transformed into an English sheepdog. Somehow he has to keep his change a secret and find just what is causing it, all the while eluding the local dog catcher.