Dr. Paul Nelson
Claire Anderson
Dr. Tom Anderson
Joan Nelson
Brig. Gen. James Pattick
Pvt. Manuel Ortiz
Sgt. Neil
Sheriff N.J. Shallert
Floyd Mason
Ellen Peters (as Karyne Kadler)
Dr. Pete Shelton (as Charles Griffith)
U.S. Secretary Platt (as Marshal Bradford)
George Haskell (as Tom Jackson)
Gen. Carpenter
Bazooka Soldier
The Monster (uncredited)