It is 1865 and Union prisoners use a military balloon to escape a Southern prison camp near the end of the Civil War. The balloon drifts for days and finally lands on a mysterious volcanic island with very unusual inhabitants. Also landing, in a better aircraft, is Rulu, a visitor from Mercury. She seeks a radio-active material that will enable her to manufacture an explosive that will destroy the world or, at least, the portion known as Earth in this 15 Chapter Serial from the 1950s.
Unfortunately the movie Mysterious Island is not yet available on HBO Max.
| Directing | Spencer Gordon Bennet | Director |
| Writing | Lewis Clay | Screenplay |
| Writing | Royal K. Cole | Screenplay |
| Writing | George H. Plympton | Screenplay |
| Writing | Jules Verne | Novel |
| Production | Sam Katzman | Producer |
| Camera | Fayte M. Browne | Director of Photography |
| Editing | Earl Turner | Editor |
| Art | Paul Palmentola | Art Direction |
| Production | Herbert B. Leonard | Production Manager |
| Directing | R. M. Andrews | Assistant Director |
| Sound | J. S. Westmoreland | Sound Engineer |
| Crew | George Robotham | Stunts |
| Crew | Wally West | Stunt Double |
| Sound | Mischa Bakaleinikoff | Music Director |
