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The Avengers: Earth’s Mightiest Heroes: 1x21
Hail Hydra!
Black Widow turns to the Avengers for help when Hydra and AIM battle over control of the Cosmic Cube.
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1 - 2Breakout (2) Oct. 20, 2010
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1 - 4Thor the Mighty Oct. 24, 2010
1 - 5Hulk Versus the World Oct. 24, 2010
1 - 6Meet Captain America Oct. 24, 2010
1 - 7The Man in the Ant Hill Oct. 24, 2010
1 - 8Some Assembly Required Oct. 27, 2010
1 - 9Living Legend Nov. 03, 2010
1 - 10Everything Is Wonderful Nov. 10, 2010
1 - 11Panther's Quest Nov. 17, 2010
1 - 12Gamma World (1) Nov. 26, 2010
1 - 13Gamma World (2) Nov. 26, 2010
1 - 14Masters of Evil Dec. 05, 2010
1 - 15459 Dec. 12, 2010
1 - 16Widow's Sting Dec. 19, 2010
1 - 17The Man Who Stole Tomorrow Jan. 09, 2011
1 - 18Come the Conqueror Jan. 16, 2011
1 - 19The Kang Dynasty Jan. 23, 2011
1 - 20The Casket of Ancient Winters May. 15, 2011
1 - 21Hail Hydra! May. 22, 2011
1 - 22Ultron-5 May. 29, 2011
1 - 23The Ultron Imperative Jun. 05, 2011
1 - 24This Hostage Earth Jun. 12, 2011
1 - 25The Fall of Asgard Jun. 19, 2011
1 - 26A Day Unlike Any Other Jun. 26, 2011