Robert Caulfield
Col. Charles Brubaker
Kay Brubaker
Lt. Col. Peter Willis
Cmdr. John Walker
Dr. James Kelloway
Judy Drinkwater
Albain
Hollis Peaker
Walter Loughlin
Sharon Willis
Betty Walker
Elliot Whitter
Control Room Man
Capsule Communicator
Vice President Price
F.B.I. Man Number 1
General Enders
President
Dr. Bergen
Dr. Burroughs
Horace Gruning
Mrs. Peaker
Jerry
Alva Leacock
Reporter (uncredited)