The Avengers: Earth's Mightiest Heroes Wiki

Hail, Hydra! is the twenty-first episode of Season One of Avengers: Earth's Mightiest Heroes and the overall series.


The Black Widow requests the help of the Avengers and S.H.I.E.L.D. in retrieving the Cosmic Cube before A.I.M. and HYDRA tear the world apart fighting over it.


While Hawkeye is going to shot the apple, the lights went out by the Electromagnetic Pulse while the Black Widow shows up on the Avengers' doorstep. She asks for help because AIM have succeed in making a cosmic cube - a device capable of altering reality to anyone's desires - and it needs to be destroyed before either side can use it. HYDRA and AIM both want the cube, so the Avengers have to fight both of them as war ensues across all over New York.

Agent Maria Hill, now serving as acting director of SHIELD since Nick Fury has gone for a vacation and became the General for demotion, attempts to detain the Avengers during the chaos. In the end, Captain America grabs the cube before Baron von Strucker, but the reality-warping device apparently changes nothing, to Strucker's dismay.

The episode ends with Black Widow and Hawkeye kissing in the alley as Widow goes on the run. The next morning at the mansion, the Avengers then wonder why the cube did not work, and ask Captain America what he would have done if the cube worked, to which he responds that he wouldn't have changed anything. However, a flashback to 1945 of the World War II's final battle in the Arctic shows that Bucky was surviving the explosion of the missile but he lost his arm, suggesting that Captain America's contact with the cosmic cube may have prevented Bucky's death.



  • In the end of this episode, it reveals that Bucky loses his arm. And for the future, he will have a new metal arm and have a new name called Winter Soldier and work with the Red Skull and his Code Red team.
  • Hulk remembered the time that the Black Widow attacked her in the desert with Hawkeye from the episode "Hulk vs the World".
  • The scene of Captain America inspiring the Hulk about being a hero reveals that the Hulk will never be a bad monster while having the right to protect the people like in the Lionsgate's 2009 film Hulk Vs. Wolverine where he fought against the Weapon X.