Elenco
Lee Van Cleef
Dr. Tom Anderson
Beverly Garland
Claire Anderson
Peter Graves
Dr. Paul Nelson
Sally Fraser
Joan Nelson
Russ Bender
General James Pattick
Jonathan Haze
Pvt. Miguel Ortiz
Dick Miller
Sgt. Neil
Paul Harbor
Floyd Mason
Charles B. Griffith
Dr. Pete Shelton
Karen Kadler
Ellen Peters
Taggart Casey
Sheriff N.J. Shallert
Thomas E. Jackson
George Haskell
Marshall Bradford
U.S. Secretary Platt
David McMahon
Gen. Carpenter
Paul Blaisdell
The Monster (uncredited)
Equipe
James H. Nicholson
Executive Producer
Paul Blaisdell
Special Effects
Roger Corman
Director
Ronald Stein
Original Music Composer
Samuel Z. Arkoff
Executive Producer
Charles B. Griffith
Writer
Roger Corman
Producer
Lou Rusoff
Screenplay
Paul Blaisdell
Creature Design
Frederick E. West
Director of Photography
Charles Gross Jr.
Editor
Larry Butterworth
Makeup Artist
Lou Place
Production Manager
Jay Ashworth
Sound
Al Overton Sr.
Sound
Philip Mitchell
Sound