Richard Denning
Dr. Chet Walker
S. John Launer
Capt. Dave Harris
Michael Granger
Frank Buchanan
Gregory Gaye
Dr. Wilhelm Steigg
Angela Stevens
Joyce Walker
Charles Evans
Chief Camden
Tris Coffin
Dist. Atty. MacGraw
Pierre Watkin
Mayor Bremer
Harry Lauter
Reporter #1
Larry J. Blake
Reporter #2
Nelson Leigh
Dr. Kenneth C. Norton (uncredited)
Lane Chandler
Gen. Saunders (uncredited)
Don C. Harvey
Lester Banning (uncredited)
Richard H. Cutting
Dick Cutting, Radio Broadcaster (uncredited)
Paul Bradley
Gambling Casino Employee (uncredited)
Karl 'Killer' Davis
Willard Pearce (uncredited)
Terry Frost
Tom, Policeman (uncredited)
Cap Somers
Policeman (uncredited)
Tyler McVey
Police Officer (uncredited)
Chuck Hicks
Pilot (uncredited)
Charles Horvath
Creature (uncredited)
Boyd 'Red' Morgan
Creature (uncredited)
Michael Ross
Creature Vernon Dunn (uncredited)
Linda Bennett
Penny Walker
Paul Hoffman
Tom Dunn (uncredited)
Edward Coch
Jason Franchot (uncredited)
Eddie Foster
Bartender (uncredited)
Bill Clark
Policeman (uncredited)
Dick Crockett
Creature Who Calls Camden (uncredited)
George Bruggeman
Creature (uncredited)