The Avengers: Earth's Mightiest Heroes

The Super Villain Prisons open wide, simultaneously releasing every single villain in a breakout like the world has never seen. Part 1 of 2.

A flashback to 10 years before reveals Graviton's origin. In the present, Iron Man is outnumbered by old enemies at the Vault. To escape and fight Graviton, Tony self-destructs the Vault, but his armor was damaged and he radios a replacement from his Chicago tower. Thor, Hank Pym, and Wasp try to fight Graviton. Later, they are joined by Hulk and Iron Man and with their combined power they defeat Graviton and form the Avengers in order to catch the 74 escaped supervillians that escaped the four prisons.

When the villainous organization known as HYDRA attacks the United Nations, the fate of the world's leaders is in the hands of Iron Man.

The villainous Wrecking Crew are tearing through New York City, and the only thing that’s standing in their way? The Mighty Thor! But when Thor is called back to Asgard by his father Odin, he’s forced to face off against an army of Frost Giants led by the evil Loki… Thor’s adopted brother. But even if Thor wins the battle, he may have lost more than he realizes, for nothing is ever as it seems with Loki…

Bruce Banner is on the run from the Hulkbuster units in Las Vegas when he meets Absorbing Man and attempts to recruit him to help stop gamma experimentation. Meanwhile, Hawkeye and Black Widow catch up to Hulk, where he proves to them that he is not a monster. Later, Hawkeye discovers that Black Widow may have a dirty secret.

In the closing days of World War II, Captain America and Bucky join forces with Jack Fury and his Howling Commandos for a final confrontation with the Red Skull and his Hydra forces! But as the battle unfolds, they’re being watched by a visitor from the future. His name is Kang the Conqueror, and he’s on a mission to save the world.