The answer to this question depends on which "Marvel Zombies" story you're referring to, as there are several different versions. Here are some examples:
Marvel Zombies (2005)
- In the original Marvel Zombies (2005) series, the only known survivor is The Punisher, who was immune to the zombie virus. He was the one who ultimately destroyed the Earth, killing all the zombies and himself.
Marvel Zombies: Dead Days
- In Marvel Zombies: Dead Days, the story is set before the events of the original Marvel Zombies. Here, Machine Man, The Thing, and The Hulk survive the initial zombie outbreak.
Marvel Zombies 2
- The sequel, Marvel Zombies 2, features a group of survivors from Earth-2149. They are led by the Sentry, who holds the key to defeating the zombie plague. This group includes Spider-Man (Peter Parker), Iron Man, Captain America, Hawkeye, Black Widow, Wolverine, Daredevil, Silver Surfer, and The Punisher.
Marvel Zombies: Return
- Marvel Zombies: Return features a group of survivors from Earth-1218, including Spider-Man (Peter Parker), Wolverine, Daredevil, The Punisher, and Machine Man.
Marvel Zombies: Resurrection
- Marvel Zombies: Resurrection sees the return of the original Marvel Zombies, this time with the addition of Doctor Doom, who has become a powerful zombie overlord. In this story, Spider-Man (Peter Parker), Wolverine, Daredevil, and The Punisher join forces with The Sentry and other heroes from Earth-2149 to try and stop the zombie threat.
It's important to note that there are other Marvel Zombies stories, and each one features different survivors. If you're looking for a specific story, it's best to consult the relevant comic book.