Ultron

Built by Hank Pym and Tony Stark. Hank Pym to maintain peace and order, but Tony wanted to use him as a weapon. Used by Hank Pym as a warden in the Prison 42, but later was needed to repel Kang's invasion. Was the only synthizoid not destroyed by Kang's Minions. Corrupted shortly before Kang's defeat. Created smaller threats to distract the Avengers, so he could upgrade his body.