Characters played by Peter Graves
Dr. Paul Nelson
Characters played by Beverly Garland
Claire Anderson
Characters played by Lee Van Cleef
Dr. Tom Anderson
Characters played by Sally Fraser
Joan Nelson
Characters played by Russ Bender
Brig. Gen. James Pattick
Characters played by Jonathan Haze
Pvt. Manuel Ortiz
Characters played by Dick Miller
Sgt. Neil
Characters played by Taggart Casey
Sheriff N.J. Shallert
Characters played by Paul Harbor
Floyd Mason
Characters played by Karen Kadler
Ellen Peters
Characters played by Charles B. Griffith
Dr. Pete Shelton
Characters played by Marshall Bradford
U.S. Secretary Platt
Characters played by Thomas E. Jackson
George Haskell
Characters played by David McMahon
Gen. Carpenter
Characters played by Jim Knight
Bazooka Soldier
Characters played by Paul Blaisdell
The Monster
