In "Marvel Zombies Return", it is revealed that the Sentry's infection and universal travel is a predestination paradox. When the Giant-Man of the Marvel Zombies universe comes to a past version of the Marvel Universe, he infects the Hulk, who then infects the Sentry. At the conclusion of the story, Sentry is sent through the multiverse by that Earth's version of Uatu the Watcher and infects the Avengers, setting off the entire series of events while 'containing' the infection between these two universes so that it will essentially 'devour itself'. In the one-shot "Marvel Zombies: Evil Evolution", Zombie Reed Richards speculates that a dimensional teleporter he was testing may have pulled the Sentry from his reality, though whether this was from the Gates of Heaven or was the other end of Uatu's teleporter is not revealed.