Lee Van Cleef
Dr. Tom Anderson
Acting
Beverly Garland
Claire Anderson
Acting
Peter Graves
Dr. Paul Nelson
Acting
Sally Fraser
Joan Nelson
Acting
Russ Bender
General James Pattick
Acting
Jonathan Haze
Pvt. Miguel Ortiz
Acting
Dick Miller
Sgt. Neil
Acting
Paul Harbor
Floyd Mason
Acting
Charles B. Griffith
Dr. Pete Shelton
Writing
Karen Kadler
Ellen Peters
Acting
Taggart Casey
Sheriff N.J. Shallert
Acting
Thomas E. Jackson
George Haskell
Acting
Marshall Bradford
U.S. Secretary Platt
Acting
David McMahon
Gen. Carpenter
Acting
Paul Blaisdell
The Monster (uncredited)
Visual Effects