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.
| Writing | Lewis Clay | Screenplay |
| Writing | Jules Verne | Novel |
| Directing | Spencer Gordon Bennet | Director |
| Writing | Royal K. Cole | Screenplay |
| Writing | George H. Plympton | Screenplay |
| Editing | Earl Turner | Editor |
| Sound | Mischa Bakaleinikoff | Music Director |
| Camera | Fayte M. Browne | Director of Photography |
| Directing | R. M. Andrews | Assistant Director |
| Art | Paul Palmentola | Art Direction |
| Crew | George Robotham | Stunts |
| Production | Sam Katzman | Producer |
| Production | Herbert B. Leonard | Production Manager |
| Sound | J. S. Westmoreland | Sound Engineer |
| Crew | Wally West | Stunt Double |
