A race of enigmatic, gigantic space gods, believed to be one of the first races in the universe to achieve sentience. The Celestials do not interact with other species or civilisations in any understandable way, and stand apart from all galactic and intergalactic events. Their only interest seems to be in modifying the genetic code of other species in an ongoing series of experiments – experiments that have shaped the evolutions of countless races.

The human race (native to Earth) seems to have been of particular interest to Celestial scientists, and their experiments have given rise to the Eternals, their twisted cousins the Deviants, a staggering variety of mutants and the propensity of humans to gain unique powers in response to even the most minor of external stimuli.

Each Celestial is a giant more than 500 metres tall, capable of impossible feats of energy manipulation and immune to any external threat.