Avengers (1963) #57
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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.
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."