Dr. John Meredith has been driven from civilization by the criminal activities of his twin brother Bradley Meredith. With his infant daughter, he settles in the African jungle, where his ability to cure the native ills has resulted in his virtual control of the Masamba tribes, who possess vast diamond mines coveted by a gang of crooks.
| Actor | Role |
|---|---|
 Frances GiffordNyoka Meredith | Nyoka Meredith |
 Tom NealJack Stanton | Jack Stanton |
 Trevor BardetteDr. John Meredith / Bradley Meredith | Dr. John Meredith / Bradley Meredith |
 Gerald MohrSlick Latimer | Slick Latimer |
 Eddie AcuffCurly Rogers | Curly Rogers |
 Frank LackteenShamba | Shamba |
 Tommy CookKimbu | Kimbu |
 Robert BarronBombo | Bombo |
 Al KikumeChief Lutembi [Chs. 1, 4-6] | Chief Lutembi [Chs. 1, 4-6] |
 Bud GearyBrock | Brock |
 Al TaylorClaggett | Claggett |
 Joe McGuinnTed Bone | Ted Bone |
| JJerry FrankThe Lion Chief | The Lion Chief |
 Ken TerrellMananga (as Kenneth Terrell) | Mananga (as Kenneth Terrell) |