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It's up to Hawkeye, the Hulk, and Thor to save the day when the Leader's gamma radiation ray mutates the rest of the Avengers and threatens to do the same to every human on earth.
Episodes
1Breakout (1) 2Breakout (2) 3Iron Man Is Born 4Thor the Mighty 5Hulk Versus the World 6Meet Captain America 7The Man in the Ant Hill 8Some Assembly Required 9Living Legend 10Everything Is Wonderful 11Panther's Quest 12Gamma World (1) 13Gamma World (2) 14Masters of Evil 15459 16Widow's Sting 17The Man Who Stole Tomorrow 18Come the Conqueror 19The Kang Dynasty 20The Casket of Ancient Winters 21Hail Hydra! 22Ultron-5 23The Ultron Imperative 24This Hostage Earth 25The Fall of Asgard 26A Day Unlike Any Other