Overview
G-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.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 38 | June 7, 1958 (60) | |
 | 28 | December 22, 1993 (86) | |
 | 30 | March 27, 1959 (54) | |
 | 45 | September 28, 1965 (75) | |
 | 55 | September 19, 1963 (83) | |
 | 38 | January 30, 1974 (77) | |
 | 41 | July 18, 1961 (67) | |
 | 64 | December 13, 1940 (69) | |
| - | - |