Dr. Chet Walker
Joyce Walker
Police Capt. Dave Harris
Frank Buchanan
Dr. Wilhelm Steigg (as Gregory Gay)
Penny Walker
District Attorney MacGraw
Reporter #1
Reporter #2 (as Larry Blake)
Police Chief Camden
Mayor Bremer
Casino Employee (uncredited)
Creature (uncredited)
Gen. Saunders (uncredited)
Policeman (uncredited)
Jason Franchot (uncredited)
Creature Who Calls Camden (uncredited)
Dick Cutting--Radio Broadcaster (uncredited)
Willard Pearce (uncredited)
Bartender (uncredited)
Tom--Policeman (uncredited)
Reporter (uncredited)
Lester Banning (uncredited)
Pilot (uncredited)
Tom Dunn (uncredited)
Dr. Kenneth C. Norton (uncredited)
Police Officer (uncredited)
Creature Vernon Dunn (uncredited)