Thanos, also known as The Mad Titan, is 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).