The Avengers: Earth's Mightiest Heroes!
The Avengers: Earth's Mightiest Heroes! is an American animated television series by Marvel Animation in cooperation with Film Roman, based on the Marvel Comics superhero team the Avengers. The show debuted on Disney XD and online in the fall of 2010, starting with a 20-part micro-series.
As 75 of the world's most dangerous super-villains are mysteriously freed en masse from the Vault, the Cube, the Big House, and the Raft, five of Earth's mightiest heroes assemble a crime-fighting alliance called the Avengers. The Avengers team is composed of Iron Man (Tony Stark) as de facto team leader, Ant-Man/Giant-Man (Hank Pym), the Hulk (Bruce Banner), Thor, and the Wasp (Janet Van Dyne). Captain America (Steve Rogers) joins the team later after being found frozen in ice while the team is looking for a missing Hulk. Future members of team for season one include Black Panther (T'Challa) and Hawkeye (Clint Barton). In the season finale, it is revealed that Thor's stepbrother Loki was responsible for the breakouts so that Amora the Enchantress and Skurge the Executioner could build his Masters of Evil to defeat Thor.