Ultron

Ultron is a supervillain appearing in American comic books published by Marvel Comics, most commonly serving as one of the main antagonists of the Avengers franchise, the main antagonist of the Ant-Man series, the overarching antagonist of The Wasp series, and a major antagonist in the Iron Man franchise. He has also served as the titular main antagonist of many Marvel storylines, such as Ultron Unlimited, Age of Ultron and more. Created by writer Roy Thomas and artist John Buscema, the character first appeared as an unnamed character in The Avengers #54 (July 1968), with his first full appearance in The Avengers #55 (August 1968).