Peter Graves
(Doug Martin)
James Seay
(Colonel Banks)
Steve Pendleton
(Briggs)
Frank Gerstel
(Dr. Kruger)
John Merrick
(Deneb•Tala)
Barbara Bestar
(Ellen Martin)
Shepard Menken
(Major Clift)
Jack Daly
(Power House Guard)
Ron Kennedy
(Sentry)
Ben Welden
(Pilot)
Burt Welden
(Sergeant)
Lester Dorr
(Station Attendant)
Ruth Bennett
(Secretary)
Mark Scott
(Narrator)