Thanos

Thanos, also known as the "Mad Titan", is one of the most powerful, insane and evil of all villains in the Marvel universe, created by Jim Starlin and debuting in 1973 in an issue of Iron Man and continuing to terrorize the entire Marvel universe and beyond up to the modern era. His popularity as a supervillain is seen in his ability to hold a large presence both in mainstream Marvel and his own series while also being seen in a large array of products ranging from video games to toys and cartoons (though his nature is toned down in some of the cartoons, for obvious reasons).

He is a powerful alien warlord born on Saturn's moon, Titan, born to the race of demi-gods known as Eternals. Being the strongest of all of them and appearing as a threatening and monstrous beast, Thanos fell in love with the living female embodiment of death and is willing to destroy all of existence to win her love, no matter how powerful he must become or who dares to stop him.

He serves as the main antagonist of the 1991 six-issue comic-book series, ​The Infinity Gauntlet, with the mercenary, Nebula serving as the secondary antagonist, and Mephisto serving as a major antagonist. He also serves as the main antagonist of the two-parter, Thanos: The Final Threat, the 2010 series, The Thanos Imperative and the 2013 comic book crossover storyline, Infinity.