The Avengers: Earth's Mightiest Heroes!

Season 1 Episode 21: Hail, Hydra!

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Watch The Avengers: Earth's Mightiest Heroes! season 1 episode 21 tv series online free
Release: May 22, 2011

The Black Widow requests the Avengers' help in retrieving the Cosmic Cube before AIM and HYDRA tear the world apart fighting over it.

The Avengers: Earth's Mightiest Heroes!expand_lessSeason 1
Episode 1
Iron Man is Born!
Episode 2
Hulk vs the World
Episode 3
The Man in the Ant Hill
Episode 4
Thor the Mighty
Episode 5
Meet Captain America
Episode 6
Breakout, Part 1
Episode 7
Breakout, Part 2
Episode 8
Some Assembly Required
Episode 9
Living Legend
Episode 10
Everything is Wonderful
Episode 11
Panther's Quest
Episode 12
Gamma World, Part 1
Episode 13
Gamma World, Part 2
Episode 14
Masters of Evil
Episode 15
459
Episode 16
Widow's Sting
Episode 17
The Man Who Stole Tomorrow
Episode 18
Come the Conqueror
Episode 19
The Kang Dynasty
Episode 20
The Casket of Ancient Winters
Episode 21
Hail, Hydra!
Episode 22
Ultron-5
Episode 23
The Ultron Imperative
Episode 24
This Hostage Earth
Episode 25
The Fall of Asgard
Episode 26
A Day Unlike Any Other