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

W. Lee Wilder