The N'Garai, a.k.a. the Great Devourers, are children of the
Elder Gods who were the first beings existing on
Earth billions of years ago. Most of the Elder Gods degenerated into predatory
demons, and the benevolent
Gaea joined with the
Demiurge, the sentient life force of Earth's biosphere, spawning Demogorge, who slaughtered the corrupt Elder Gods. One of the few
Gods to survive was
Chthon, who fled to another
dimension where he created the N'Garai, sending them to their own realm with their own
Kierrok the Damned ruling over them. Millions of years ago, the N'Garai colonized Earth. They were eventually defeated and driven back to their dimension approximately one million B.C., allegedly by the
angel Lucifer prior to his fall from
Heaven. The N'Ggarai returned to Earth between 100,000 and 20,000 B.C., using humanity as slaves, pets and food. Eventually, the N'Garai were again driven from Earth, and humanity liberated. During their two sojourns on Earth, the N'Garai made enemies of various other races active there. These included the extradimensional
Undying Ones and other demon races, as well as the
Deviants, other races derived from the Elder Gods, and a numerous pre-human races.
Marvel Universe 
