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