Robin and Kato…hostages of The Joker and General Gumm?! Even worse, the kidnapped crime fighters are forced into a battle to the death by the Dastardly Duo. With their purloined partners in peril, Batman and the Green Hornet have no choice but to work together. Will they be able to track down the hidden location of the captives' cage match before either of their partners goes down for the count?