After the fallout from Age of Ultron, world governments introduce a regulation act aimed at controlling superhuman actions. This creates a rift among the Avengers, splitting them into two opposing teams led by Iron Man and Captain America. As loyalties are tested and friendships strained, the heroes engage in a fierce conflict, pitting former allies against each other in a dramatic showdown. The clash not only challenges their beliefs but also raises questions about accountability and the true nature of heroism.