After arriving on Arkham Island, Batman is greeted by Warden Sharp and security personnel. Although the Joker is securely strapped to a handcart for transfer to the deepest bowels of Arkham, he escapes nonetheless, and this is going to be the worst night of Batman's life. With the Joker free, inciting unrest among the inmates, Batman faces a riot from a cadre of Gotham City's most-wanted killers and psychopaths who are screaming for vengeance and out for blood… Batman's blood. His mission? Stop the Joker and his accomplices, at all costs!