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Marvel Zombies: Evil Evolution

This one-shot is a crossover between the zombies and the Marvel Apes. It resolves some of the remaining questions over the origin of the zombie plague and is set between Dead Days and Crossover. The story starts in the zombieverse shortly after "Dead Days." Zombie Giant-Man and Wasp discover the Ape-verse (as seen in the previous Apes specials) and take a trip there to devour its populace. We later learn that the Prime Eight scared them back to their dimension.

The Ape-vengers are now leading a pre-emptive strike into the zombieverse to get the zombies before they get the Apes. There's heavy casualties on both sides. Zombie Reed-Richards is decapitated, but still mobile. He teams up with the Gibbon, Gorilla Girl, Ape-X, Speedball, Spider-Monkey, and the rest of the characters to alter history so that the Ape and Zombie universe never meet.

The team is successful. History is changed so that the Apes never found Speedball back in the Speedball special, so the zombies never discover either universe. However, Gorilla Girl had to sacrifice herself to change history, so she ceases to exist.

It is also implied that a dimensional portal Reed Richards had earlier been testing had something to do with bringing the Zombie Sentry to his Earth, though this is not made clear how this fits in with the rest of the Marvel Zombies series.