Ultron is a fictional supervillain appearing in American comic books published by Marvel Comics. He is most recognized as a foe of the Avengers, and has a quasi-familial relationship with several of their members, especially his creator Hank Pym. He was the first Marvel Comics character to wield the fictitious metal alloy adamantium.
Ultron has appeared in several media adaptations, including animated television series, an animated film, and video games. The character is portrayed by actor James Spader in the 2015 film Avengers: Age of Ultron.