Galactus

Galan was born during the last years of his universe, just as the Big Bang, which created the current universe, was approaching. As a scientist, Galan was able to inform his people of the impending doom to not only Taa but the universe itself. The very atoms of the universe were changing, and they watched as civilizations died.

Soon, residents of Taa began dying of radiation poisoning, and even their advanced skills could not stop it. He persuaded some crewmen to fly along with himself in a space vessel into the terminal point of the universe as a last act of heroism for his people. Everyone on the ship died but himself, and a cosmic being calling itself the Sentience of the Universe appeared, telling Galan they both must die. The being combined with Galan and became part of the new universe as a cosmic egg.

Galactus was created, along with his starship and the embodiments of Death and Eternity. He stayed within his starship, dormant, for billions of years. A Watcher found the ship and thought it to be interesting. He then brought it down out of a planet's orbit, thus breaking his oath of non-interference. He awoke the incredibly powerful entity on-board. Having one chance to destroy it but not wishing to interfere further, the Watcher allowed the entity to live.