Ten years after his retirement, a troubled Batman returns to the streets, evening the score with criminals in an increasingly violent manner, which brings trouble from the police and a gang called the Mutants.
Batman is forced to stop Mr. Freeze, who has never gotten over the death of his wife and plans on ruining Valentine's Day in Gotham by refrigerating the entire city.
Superman is joined by Batman and Wonder Woman in an effort to stop Kryptonian criminal General Zod and his followers who have broken free from the Phantom Zone.