At a glittering award ceremony in Gotham City, billionaire Bruce Wayne beats out the scheming Lex Luthor for the coveted "Man of the Year" honor. The celebration is cut short when the Joker and a gang of Batman's most notorious foes storm the stage, robbing the guests and making off with the prize. Springing into action, Bruce dons the cowl and, alongside his partner Robin, foils the villains and hauls the Joker off to Arkham Asylum. But the victory is short-lived. Lex Luthor, convinced the Joker's mind-altering laughing gas could sweep him into the presidency, breaks the clown prince out of confinement using a powerful new weapon, and the two unlikely partners join forces. As their scheme escalates, Batman finds himself reluctantly drawn toward an alliance with the Man of Steel himself.