 Richard DenningDr. Chet Walker | Dr. Chet Walker |
 S. John LaunerCapt. Dave Harris | Capt. Dave Harris |
 Michael GrangerFrank Buchanan | Frank Buchanan |
 Gregory GayeDr. Wilhelm Steigg | Dr. Wilhelm Steigg |
 Angela StevensJoyce Walker | Joyce Walker |
 Linda BennettPenny Walker | Penny Walker |
 Charles EvansChief Camden | Chief Camden |
 Tristram CoffinDist. Atty. MacGraw | Dist. Atty. MacGraw |
 Pierre WatkinMayor Bremer | Mayor Bremer |
 Harry LauterReporter #1 | Reporter #1 |
 Larry J. BlakeReporter #2 | Reporter #2 |
| PPaul HoffmanTom Dunn (uncredited) | Tom Dunn (uncredited) |
 Nelson LeighDr. Kenneth C. Norton (uncredited) | Dr. Kenneth C. Norton (uncredited) |
| EEdward CochJason Franchot (uncredited) | Jason Franchot (uncredited) |
 Lane ChandlerGen. Saunders (uncredited) | Gen. Saunders (uncredited) |
 Don C. HarveyLester Banning (uncredited) | Lester Banning (uncredited) |
 Richard H. CuttingDick Cutting, Radio Broadcaster (uncredited) | Dick Cutting, Radio Broadcaster (uncredited) |
| PPaul BradleyGambling Casino Employee (uncredited) | Gambling Casino Employee (uncredited) |
 Karl 'Killer' DavisWillard Pearce (uncredited) | Willard Pearce (uncredited) |
 Terry FrostTom, Policeman (uncredited) | Tom, Policeman (uncredited) |
 Cap SomersPoliceman (uncredited) | Policeman (uncredited) |
 Tyler McVeyPolice Officer (uncredited) | Police Officer (uncredited) |
| EEddie FosterBartender (uncredited) | Bartender (uncredited) |
| BBill ClarkPoliceman (uncredited) | Policeman (uncredited) |
 Chuck HicksPilot (uncredited) | Pilot (uncredited) |
| DDick CrockettCreature Who Calls Camden (uncredited) | Creature Who Calls Camden (uncredited) |
| GGeorge BruggemanCreature (uncredited) | Creature (uncredited) |
 Charles HorvathCreature (uncredited) | Creature (uncredited) |
 Boyd 'Red' MorganCreature (uncredited) | Creature (uncredited) |
 Michael RossCreature Vernon Dunn (uncredited) | Creature Vernon Dunn (uncredited) |
