El Joker, el enemigo por excelencia del Cruzado enmascarado, ha conseguido escaper del Asilo Arkham. Batman lo persigue hasta un almacén abandonado donde el payaso ha establecido su centro de operaciones.
When animals and people begin to disappear in one of Gotham City's parks, Batman suspects that the deadly Poison Ivy and her creepy plants are at work. But the green villainess is locked behind bars.