N/ANR55 minsG-Man Ted Riley is ordered to investigate happenings at Diamond Island, where a bogus Major Gray is reported engaged in manufacturing a new brand of secret gas for his own purposes. Riley blows up his motor boat just off the island and is picked up by Gray's men. On the island he discovers chemist Professor Baker (John Cowell) and his daughter, Anne, are held captive by Major Gray.
Ted 'Rip-Roaring' Riley
Ann Baker
Major Gray
Sparko - Henchman
Professor Baker
Franko - Henchman
Bruno - Henchman
Chief Martin
Lun - Houseboy
