Dr. Tom Anderson

Lee Van Cleef

Acting

Claire Anderson

Beverly Garland

Acting

Dr. Paul Nelson

Peter Graves

Acting

Joan Nelson

Sally Fraser

Acting

General James Pattick

Russ Bender

Acting

Pvt. Miguel Ortiz

Jonathan Haze

Acting

Sgt. Neil

Dick Miller

Acting

Floyd Mason

Paul Harbor

Acting

Dr. Pete Shelton

Charles B. Griffith

Writing

Ellen Peters

Karen Kadler

Acting

Sheriff N.J. Shallert

Taggart Casey

Acting

George Haskell

Thomas E. Jackson

Acting

U.S. Secretary Platt

Marshall Bradford

Acting

Gen. Carpenter

David McMahon

Acting

The Monster (uncredited)

Paul Blaisdell

Visual Effects