Medical researchers Jerry Evans and Walt Hedges are assigned by a pharmaceutical company to work at a secret laboratory on a remote South Pacific Island in order to produce penicillium, the mold from which the magic drug penicillin is derived.
| Actor | Role |
|---|---|
 Tom NealJerry Evans | Jerry Evans |
 Ann SavagePat Benson | Pat Benson |
 J. Carrol NaishDr. Augustus Hadley | Dr. Augustus Hadley |
 Abner BibermanGabe Fabian | Gabe Fabian |
 Robert B. WilliamsWalt Hedges (as Robert B. Williams) | Walt Hedges (as Robert B. Williams) |
 George LynnNorman Fosmer | Norman Fosmer |
 Alex HavierFuzzytop (as J. Alex Havier) | Fuzzytop (as J. Alex Havier) |