The Gray Death is an epic campaign module used with the award-winning role-playing game Mutant: Year Zero and its expansions. It is a 96-page, full-color, hardcover book that connects the stories of Mutant: Year Zero, Mutant: Genlab Alpha, Mutant: Mechatron, and Mutant: Elysium. The mutants, animals, robots, and humans must put aside their differences and unite against a common threat to the world at the end of days.