Marvel Premiere (1972) #55
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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.
Simon Williams agreed to undergo an experiment to give him superhuman powers, and Baron Zemo gave him the costumed guise of Wonder Man, warning Simon that he would die without further treatments from Zemo in order to ensure his loyalty, but Simon betrayed Zemo to the Avengers and ultimately joined their ranks.