 Daka sends his American henchmen, along with a zombie that he controls by microphone via an electronic brain implant, to steal the precious metal.Batman discovers the plot and eventually routs the gang after a terrific battle.In his secret Bat's Cave, the Batman interrogates one of Daka's henchmen, who reveals the radium was to have been taken to The House of the Open Door, located in the mostly deserted "Little Tokyo" section of Gotham City.