Actor Errol Flynn takes a group of scientists from the California Institute of Oceanography on an expedition to the South Seas aboard his schooner, The Zaca.
| Actor | Role |
|---|---|
 Errol FlynnHimself / Narrator | Himself / Narrator |
| CCarl L. HubbsHimself | Himself |
| LLaura HubbsHerself | Herself |
| TTheodore FlynnHimself | Himself |
| JJohn DeckerHimself | Himself |
 Howard HillHimself | Himself |
| NNora EddingtonHerself | Herself |