| 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
- Oliver Cotton as Spearman
Uncredited[]
- Glenda Allen as Nurse / Cavewoman
- Tony Allyn as Security Guard Tony Allan
- Sarah Bullen as Operative Kate
- Andy Dempsey, Annie Lambert, Robert Phillips and Michael Stevens as Main Mission Operatives
- Chai Lee and Kathleen Mallory as Nurses
- Alan Meacham as Sandos
- Colin Rix as Eagle One Co-Pilot
- Suzanne Roquette as Tanya Aleksandr
- Lynda Westover as Alphan
- Chris Williams as Caveman
Crew[]
- Directed by Bob Kellett
- Written by Jesse Lasky Jr. (Credited as Jesse Lasky Jnr.) and Pat Silver
- 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 (Uncredited): Bill Beavis
- Props (Uncredited): John Chisholm
- Sound Recordist: David Bowen
- Sound Editor: Peter Pennell
- Special Effects Director: Nick Allder
- Electronics: Michael S.E. Downing
- Camera Operator: Frank Drake
- Special Effects: Brian Johnson
- Lighting Cameraman: Harry Oakes
- Model Maker (Uncredited): Andrew Kelly
- Camera Operator: Neil Binney
- Costumes: Moon City: Rudi Gernreich
- Wardrobe: Eileen Sullivan
- Associate: Vic Elms
- Music Editor: Alan Willis
- Script Editor: Johnny Byrne
- Continuity: Gladys Goldsmith
- Drivers (Uncredited): Ray Atkins, Steve Smith and Doug Wetherley
- Cutting Room: Frederick Buckman
- Story Consultant: Christopher Penfold[1]