Avengers Assemble (2012) #15
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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.
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.
Nephew of the villainous Black Knight that went by the name of Nathan Garrett, Dane was summoned by his uncle when he was mortally wounded following a battle with Iron Man.