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)