The Mighty Avengers (2007) #35
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With the end of the Vietnam War, John Walker thought his dreams of becoming a war hero had also ended, until he learned of the Power Broker, who could give anyone superhuman powers, which Walker used to first become Super-Patriot and later, U.S. Agent.
Arguably the greatest and certainly the most horrific creation of scientific genius Dr. Henry Pym, Ultron is a criminally insane rogue sentient robot dedicated to conquest and the extermination of humanity.