Iron Man & Hulk: Heroes United

The plot centers around Iron Man and Hulk, who are initially at odds but must join forces to tackle a powerful new threat. After a series of environmental disasters signal something amiss, Iron Man investigates and discovers that an artificial creature named Zzzax has been created from excessive amounts of energy. Zzzax, now unleashed and growing more powerful by the minute, threatens global destruction. Concurrently, Hulk’s immense strength and fury are drawn into the fray, leading to an initial clash between the two heroes due to misunderstandings and unstable alliances.

Realizing the gravity of Zzzax's capabilities and the worldwide peril it poses, Iron Man and Hulk set aside their differences and pool their resources and intellect to devise a strategy to neutralize this energy-based menace. They travel to multiple locations, facing numerous smaller threats and challenges orchestrated by those who seek to exploit Zzzax’s power for their gain. Along the way, they battle through high-stakes scenarios that test their abilities and partnership. Their combined skills demonstrate the importance of teamwork, resilience, and the mingling of brain and brawn. Ultimately, they move towards a climactic confrontation with Zzzax where the fate of humanity hangs in the balance.