An elderly English doctor and his 14-year old American nephew go on a perilous journey to Africa in an hot air balloon with an African guide, to retrieve a precious diamond from the top of a volcanic rock, as a gift for Queen Victoria.
| Actor | Role |
|---|---|
 Booker BradshawNot listed | Not listed |
 Cathleen CordellNot listed | Not listed |
 Johnny HaymerNot listed | Not listed |
 Loren LesterNot listed | Not listed |
 Laurie MainNot listed | Not listed |
 John StephensonNot listed | Not listed |
| GGene WhittingtonNot listed | Not listed |