Shuma Gorath is part of a pantheon of extradimensional gods called the Many-Angled Ones. He has conquered many universes, being powerful enough to have defeated the Eternities and Deaths of those universes.
Although he frequently appears as a green octopus, there is some debate as to whether this is his true form or simply the form his energy takes while in our dimension.
The name Shuma Gorath was first mentioned in a 'Kull' story by Robert E. Howard titled 'The Curse of the Golden Skull', which went unpublished till 1967.
