Thanos (Earth-5180)

"Happy birthday, Kryptonian. I give you oblivion. First I'll kill the Amazon, then the bat. Then I'll take this planet. A new Sakaar."

- - Thanos

Thanos was the tyrannical warlord ruler of Sakaar, who, through the power of his Black Mercies, was able to control, intimidate, and kill those who defied him. Hosting the Contest of Champions at the planet's capital, he hoped that such attractions could hide the poverty and state of the planet. After his forces abducted Superman and Hulk, his reign started a downfall following a revolution. Returning years later in an attempt to kill both Earth heroes, he was left catatonic with a Black Mercy infecting his mind by Wonder Woman.

Early Life
Thanos started out as the advisor of Sakaar's former king, but he always had secret desires for the throne. Secretly manipulating the royals behind the scenes, he was able to start his coup by using the extraterrestrial Black Mercies to infect and kill his enemies, becoming the new leader of the planet.

Contest of Champions
As civilization started to downfall during his reign because of his lack of knowledge to govern its peoples, Thanos started the Contest of Champions, gladiatorial games in which he pitted locals and extraterrestrials one against another until death so the citizens of Sakaar would be amused.