The Mighty Avengers (2007) #36
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Characters
Earth's Mightiest Heroes joined forces to take on threats that were too big for any one hero to tackle. With a roster that has included Captain America, Iron Man, Ant-Man, Hulk, Thor, Wasp and dozens more over the years, the Avengers have come to be regarded as Earth's No. 1 team.
Cassie Lang is the daughter of deceased Avenger Scott Lang and a member of the Young Avengers.
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.
The metal monstrosity called Ultron created the synthetic humanoid known as the Vision from the remains of the original android Human Torch of the 1940s to serve as a vehicle of vengeance against the Avengers.