The Incredible Hulk and the Invincible Iron Man must join forces to save the Earth out of its largest threat yet! They unleash that a being of power named Zzzax when two Hydra boffins make an effort to ditch a Star K Arc Reactor with Hulk's Gamma Energy - and he's hungry for destruction. Together, Ironman and Hulk are the only force that stands in the way of the planetary blackout of their Zzzax. But the super duo will have to undergo snarling deadly robots, Wendigos Abomination, and the powerhouse. Could a couple of Marvel's mightiest heroes look for a way to work until time runs out without smashing against one another?