Get ready for the ultimate adrenaline rush with volume four of The Avengers: Earths Mightiest Heroes! In these final seven episodes of Season One, Iron Man, Thor, Captain America, Hulk and the rest of The Avengers attempt to stop Ultron and his army of robots from ending all of humanity and prevent Loki from unleashing armies from Asgard on Earth! Episodes are: The Casket of Ancient Winters Hail, Hydra Ultron-5 The Ultron Imperative This Hostage Earth The Fall of Asgard A Day Unlike Any Other