First Officer Hemmings
Space Captain
Jim Dawson
Syd
Johnny Kirk
Browne
Richard 'Dick' Corbett
Sully
Karl Schling
Christie Dudgeon
Canadian Doctor (uncredited)
Counsel
Dr. Ray Pierce (voice)
Sandy
Jimmy
Gilbert
Eddie Curtis
Bennett
Carl Mason
Nick Vashetti
Cooper
Sir Martin
Chet Lawton
Ed Jopley