After the government has banned the activity of superheroes, billionaire industrialist Bruce Wayne was forced to retire from his Batman persona. Ten years later, Gotham City is overrun with crime and terrorized by a gang known as the Mutants. The 55-year-old Wayne maintains a friendship with 70-year-old retiring Police Commissioner James Gordon, while the Joker (Batman's archenemy) has been catatonic in Arkham Asylum since Wayne's retirement.