Thanos

Thanos was a 'Divergent' Homo Immortalis, an evolutionary wildcard and an unexpected product of Celestial breeding programs. He was born on Saturn's moon of Titan and dwelt in their colony of Titanos for thousands of years. Thanos was exiled from his home for high crimes and atrocities. He returned at the head of an army and virtually annihilated his existing relatives. Only a hundred Eternals survived before Thanos' army was routed.

Of the bounty of the universe, Thanos sought only two things: absolute dominion over all life and the affections of Death. He engaged in warfare and cunning political schemes that spanned millennia. If a particularly potent item he desired was held too closely by some foreign agent or species, Thanos would simply bide his time until they inevitably died or collapsed under their own weight. In time he amassed a mighty army of sycophantic followers and potent subordinates.

Some 15,000 years ago, Thanos attempted subvert the Demiurge to fulfill his own twisted ambitions. The counterstroke of energies shattered his connection to the Demiurge and drained him of the potential cosmic power he might otherwise have attained. The shockwave of this event echoed through the universe and prompted the Celestials to investigate Earth. He turned to military conquest after that and frequently clashed with the Skrulls, Kree, Oa, and other spacefaring civilizations. He contributed to the rise of the Citadel and the collapse of the Tamaranean Empire.