History
Galactus' history presumably mirrors that of his mainstream counterpart.
After absorbing too much energy, Galactus transformed into a black hole that endangered the Andromeda Galaxy.[2] Hercules approached the black hole with a white hole device, which he used to end the black hole at the cost of his own life. As a result, Galactus was resurrected, while Hercules merged with Galactus' power becoming a new being called Cosmos that restored worlds instead of devoured them.[3]