Watch Marvel's Iron Man & Hulk: Heroes United

While training at his flying fortress, Iron Man checks for any distress signals and discovers an energy disturbance, emitting gamma radiation at a dam, he must investigate. The Hulk engages Abomination in a battle at the town nearest the dam, and they are destroying everything in sight as they mercilessly pummel each other. Hydra also gets their mischievous hands dirty trying to harness the gamma energy of the two mighty beasts attacking one another. One force wages war against another, and then another, until Iron Man and Hulk must unite to destroy a new threat created during the collective conflict.