| Episode | Credits | Transcript |
Cast[]
- Martin Landau as Commander John Koenig
- Barbara Bain as Dr. Helena Russell
- Barry Morse as Prof. Victor Bergman
- Prentis Hancock as Paul Morrow
- Clifton Jones as David Kano
- Zienia Merton as Sandra Benes
- Anton Phillips as Dr. Mathias
- Nick Tate as Alan Carter
- Lizy Scott as Outdoor Alphan
Uncredited[]
- Richard Adams, Jack McKenzie and Anita West as Technicians
- Sarah Bullen as Operative Kate]
- Loftus Burton, Andy Dempsey, Alan Harris, Michael Stevens, Maureen Tan and Lynda Westover as Main Mission Operatives
- James Fagan as Ken Johnson
- Romo Gorrara as Running Technician
- Alf Joint as Security Guard
- Quentin Pierre as Pierre Quanton
- Suzanne Roquette as Tanya Aleksandr
Crew[]
- Directed by Charles Crichton
- Written by Christopher Penfold
- Produced by Gerry Anderson (Executive Producer) and Sylvia Anderson (Producer)
- Music by Barry Gray
- Cinematography by Frank Watts
- Film Editing by Alan Killick
- Supervising Editor: David Lane (Credited as Dave Lane)
- Casting by Michael Barnes
- Production Design by Keith Wilson
- Hair Designer: Helene Bevan
- Makeup Artist: Ann Cotton
- Production Manager: Ron Fry
- Assistant Director: Ken Baker
- Scenic Artist: Bill Beavis
- Props: John Chisholm
- Sound Recordist: David Bowen
- Sound Editor: Peter Pennell
- Re-Recording Mixer: Otto Snel
- Special Effects Director: Nick Allder
- Electronics: Michael S.E. Downing
- Camera Operator: Frank Drake
- Special Effects: Brian Johnson
- Lighting Cameraman: Harry Oakes
- Model Makers: Andrew Kelly and Martin Bower
- Camera Operator: Neil Binney
- Costumes: Moon City: Rudi Gernreich
- Wardrobe: Eileen Sullivan
- Music Associate: Vic Elms
- Music Editor: Alan Willis
- Script Editor: Johnny Byrne
- Continuity: Gladys Goldsmith
- Drivers: Ray Atkins, Steve Smith and Doug Wetherley
- Runner (Uncredited): Jeremy Coote