Avengers (1963) #264
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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.
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."
Rita DeMara, hoping to show off her talent of engineering, stole a copy of the Yellowjacket costume from the Avengers Mansion.