Earth 2149: the Zombieverse

Marvel Zombies: Dead Days: This volume reprints much of stories listed below, but also the Dead Days special that precedes everything else.
Marvel Zombies vs. Army of Darkness: This story crosses into the Army of Darkness Universe.
Ultimate Fantastic Four Vol. 5: Crossover: This story crosses into the Ultimate Universe. (Also reprinted in Dead Days.)
Marvel Zombies: This story doesn’t cross over with any other universe. Really.
Ultimate Fantastic Four Vol. 6: Frightful: This story crosses into the Ultimate Universe. (Also reprinted in Dead Days.)
Black Panther: Four The Hard Way: This story crosses into the Marvel Universe. (Also reprinted in Dead Days.)
Marvel Zombies 2: This story also doesn’t cross over with any other universe. Really.
Marvel Zombies 3: This story crosses into the Marvel Universe.
Marvel Zombies 4: This story crosses into the Marvel Universe.
Marvel Zombies 5: This story crosses into the Marvel Universe.
Marvel Zombies Return