Avengers (1963) #64
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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.
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.
When Janet Van Dyne's father died, she convinced her father's associate Hank Pym to give her a supply of "Pym particles"; Pym also subjected her to a procedure which granted her the ability to, upon shrinking, grow wings and fire blasts of energy, which she called her "wasp's stings."
After brilliant scientist Henry Pym discovered a process in which he could manipulate a newly discovered group of subatomic particles through magnetic fields, he tested the serums on himself and accidentally shrunk himself to the size of an ant.