A five-issue Marvel comic series published from December 2005 to April 2006.
The story is set in an alternate universe where the world's superhero population has been infected with a virus that turned them into zombies. The series was spun out of events of the crossover story-arc of Ultimate Fantastic Four, where the zombie Reed Richards tricked his Ultimate counterpart into opening a portal to the zombie universe only for the latter to contain the former from ever coming to his universe.
An animated television series of the same name was released on Disney+ in 2025.