The Overmind is an alien belonging to the Eternals of Eyung. He was born uncounted millennia ago on the planet Eyung ("Eternus") as Grom. Acting as one of their warlords, he led massacres of entire species. He was also the reigning champion in their gladiatorial arenas. When his race had engaged the Gigantians in a war about to lead to mutual absolute destruction, Grom was chosen for his physical prowess as the receptacle for their entire population of several hundred million minds. He was launched in a protective capsule, unconscious for thousands of years while assimilating them into one single mind.