Very powerful extra-territorial Deviant who conquered worlds for his love Nirvana. He was trapped on Earth for centuries by the Eternals until he was able to use a Stargate near Sol to return to his throne world of Armechadon.
Fathered multiple children including Pelops, Id, and Lucian. Tantalus murdered Pelops for betrayal, and was ultimately killed by Lucian as Blackwulf. As an immortal though, as his father-in-law Khult said, he is likely to return through his own ego.