The plot begins when the U.S. government passes a Superhero Registration Act, ostensibly to have super-powered individuals act under official regulation, somewhat akin to law enforcement. Superheroes who oppose the act, led by Captain America, find themselves in conflict with its supporters, led by Iron Man. Spider-Man is caught in the middle, while the X-Men take a neutral stance. The superheroes who support the law, including Mister Fantastic and Ms. Marvel, become increasingly authoritarian. Civil War explores the conflict between freedom and security against a backdrop of real-life events and discussions, such as the U.S. government's increased surveillance of its citizens.[2][3]
