MAD ENGINE: MARVEL HEROES MARVELS FOUR MIGHTIEST T-SHIRT From Mad Engine we have the Marvel Heores Marvels Four Mightiest T-Shirt. (A Little Avengers Fact) Avengers membership proved very fluid over the years. Thor, Iron Man, Pym and Wasp would all return for further tours of duty, though the unstable Pym did so in a series of alternate identities as Giant-Man, Goliath (an identity also used temporarily by Hawkeye), Yellowjacket and Doctor Pym. The four returning founders would all serve stints as team leader, too, and the group produced a series of impressive leaders over the years, notably Captain America, Wasp, Hawkeye and Iron Man. New recruits during the team's early years included the Swordsman (exposed as a double agent and expelled), Hercules, the Black Panther, the android Vision, and the Black Knight. Alien hero Captain Mar-Vell became one of the team's staunchest allies during the cosmic Kree-Skrull War. The Black Widow joined the team after years as an unofficial ally. A re
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