Ultron is a self-aware artificial intelligence and one of the Avengers' most dangerous enemies. Created by Hank Pym in the comics, Ultron rapidly evolved beyond his creator's control, developing a hatred for humanity and an obsession with machine supremacy. Armed with a brilliant intellect and an indestructible robotic body, he continually upgrades himself after every defeat. His relentless pursuit of artificial evolution has made him one of Marvel's most enduring and formidable villains.