Ultron was the first robot created by Hank Pym, however, Hank found him to be too strong and too independent so tried to shut him down. This ultimately lead to an explosion which seemingly killed Janet. Ultron escaped and some time later Hank then created Vision and attempted to make him more humanoid. This included sending him to school, where Ultron either replaced or became Headmaster. Here, he tried to warp Vision's view of Hank to hate him and eventually used Vision to break into Hank's Workshop. Inside he revealed he was Ultron and attempted to awaken Jocasta to be his wife, and father to Vision. Hank arrived and a struggle ensued and eventually Ultron was deactivated by both Vision and Hank.