A schooner disappears at sea without a trace. Years later, evidence of possible survivors prompts the mother of the schooner's mate Jose to hire a tuna boat to investigate. They discover the lad living happily on a South Seas island, and, when he refuses to leave with them, they abduct him. However, Jose gets revenge by leading the ship into the lair of a mysterious giant manta ray.
| Writing | Thelma Brooks | Story |
| Writing | Terry Grey | Story |
| Writing | Juan Duval | Adaptation |
| Writing | S. Edwin Graham | Adaptation |
| Directing | S. Edwin Graham | Director |
