Dr. Chet Walker
Richard Denning
Capt. Dave Harris
S. John Launer
Reporter #2
Larry J. Blake
Tom Dunn (uncredited)
Paul Hoffman
Dr. Kenneth C. Norton (uncredited)
Nelson Leigh
Jason Franchot (uncredited)
Edward Coch
Gen. Saunders (uncredited)
Lane Chandler
Lester Banning (uncredited)
Don C. Harvey
Dick Cutting, Radio Broadcaster (uncredited)
Richard H. Cutting
Gambling Casino Employee (uncredited)
Paul Bradley
Willard Pearce (uncredited)
Karl 'Killer' Davis
Tom, Policeman (uncredited)
Terry Frost
Frank Buchanan
Michael Granger
Policeman (uncredited)
Cap Somers
Police Officer (uncredited)
Tyler McVey
Bartender (uncredited)
Eddie Foster
Bill Clark
Pilot (uncredited)
Chuck Hicks
Creature Who Calls Camden (uncredited)
Dick Crockett
Creature (uncredited)
George Bruggeman
Charles Horvath
Boyd 'Red' Morgan
Creature Vernon Dunn (uncredited)
Michael Ross
Dr. Wilhelm Steigg
Gregory Gaye
Joyce Walker
Angela Stevens
Penny Walker
Linda Bennett
Chief Camden
Charles Evans
Dist. Atty. MacGraw
Tris Coffin
Mayor Bremer
Pierre Watkin
Reporter #1
Harry Lauter
Director
Edward L. Cahn
Executive Producer
Sam Katzman
Director of Photography
Fred Jackman Jr.
Editor
Aaron Stell
Story
Curt Siodmak
Screenplay
Art Direction
Paul Palmentola
Unit Manager
Leon Chooluck
Special Effects
Jack Erickson
Set Decoration
Sidney Clifford
Sound
J.S. Westmoreland
Assistant Director
Eddie Saeta
Conductor
Mischa Bakaleinikoff