History
Galactus shared a similar history to his Earth-616 counterpart until the weapon used by Iron Man to incapacitate the Hulk destroyed New York and every hero present. The alien Skrulls took the Hulk's invasion as a sign to launch their own attack on Earth, and succeeded in conquering it and wiping out humanity.
The Hulk, the last living native of Earth, used a beacon to summon the Silver Surfer, begging him to summon Galactus to devour the planet. The Surfer, believing that as the last living native of Earth, the Hulk had the right to decide the fate of his planet, obliged and brought Galactus to devour the Earth. Saddened by the death of the planet, the Surfer decided to leave Galactus' employ, with the Hulk taking his place as Galactus' herald.[1]