 Carla BalendaJanet Keller | Janet Keller |
 Elliott ReidMatt Corbin | Matt Corbin |
 Edgar BarrierDr. Edward Keller | Dr. Edward Keller |
 Raymond BurrSteve Loomis | Steve Loomis |
 Otto WaldisDr. Wilhelm Bucholtz | Dr. Wilhelm Bucholtz |
 Michael SteeleChick | Chick |
 Lurene TuttleMolly Loomis | Molly Loomis |
 Peter BroccoNate Garr | Nate Garr |
 Lewis MartinPeterson | Peterson |
 Frank DarienLuther Adams | Luther Adams |
 Olive CareyMabel Turner | Mabel Turner |
 George BarrowsFederal Agent (uncredited) | Federal Agent (uncredited) |
 Stanley BlystoneGuard on Pier (uncredited) | Guard on Pier (uncredited) |
 Eddie BordenMedical Experiment Patient (uncredited) | Medical Experiment Patient (uncredited) |
| GGeorge BruggemanFederal Agent (uncredited) | Federal Agent (uncredited) |
 William ChalleeGuard (uncredited) | Guard (uncredited) |
 George ChandlerJed (uncredited) | Jed (uncredited) |
 G. Pat CollinsNelson - Gate Guard (uncredited) | Nelson - Gate Guard (uncredited) |
| TTom DalyGerm Experiment Victim (uncredited) | Germ Experiment Victim (uncredited) |
 Don DillawayFBI Agent McIntyre (uncredited) | FBI Agent McIntyre (uncredited) |
| AArt DupuisSpeedboat Pilot (uncredited) | Speedboat Pilot (uncredited) |
 Douglas EvansCarstairs (uncredited) | Carstairs (uncredited) |
| EElizabeth FlournoySecretary (uncredited) | Secretary (uncredited) |
 Robert FoulkGuard (uncredited) | Guard (uncredited) |
 Gregory GayeSweitart (uncredited) | Sweitart (uncredited) |
 Milton KibbeeProduce Company Proprietor (uncredited) | Produce Company Proprietor (uncredited) |
 Mathew McCueMedical Experiment Patient (uncredited) | Medical Experiment Patient (uncredited) |
 Lee MillerFederal Agent (uncredited) | Federal Agent (uncredited) |
| BBilly NelsonEd (uncredited) | Ed (uncredited) |
| JJamesson ShadeSheriff (uncredited) | Sheriff (uncredited) |
