| Episode | Credits | Transcript |
Cast[]
- Martin Landau as Commander John Koenig
- Barbara Bain as Dr. Helena Russell
- Barry Morse as Prof. Victor Bergman
- Peter Bowles as Balor
- Prentis Hancock as Paul Morrow
- Clifton Jones as David Kano
- Zienia Merton as Sandra Benes
- Anton Phillips as Dr. Bob Mathias
- Nick Tate as Alan Carter
- James Smillie (Credited as Jim Smillie) as Mike Baxter
Uncredited[]
- Glenda Allen, Judith Hepburn and Kathleen Mallory as Nurses
- Tony Allyn, Joe Dunne, Martin Grace, Quentin Pierre, Colin Skeaping, Eddie Stacey and Paul Weston as Security Guards
- Robert Atiko as Technician (uncredited)
- Binu Balani and Laurie Davis as Operatives
- Sarah Bullen as Operative Kate
- Andy Dempsey, Raymond Harris, Jan Rennison and Michael Stevens as Main Mission Operatives
- Alan Harris as Patient
- Laraine Humphrys as Information Girl
- Paul Kirby and Chris Williams as Medics
- Suzanne Roquette as Tanya Aleksandr
- Vincent Wong as Toshiro Fujita
Crew[]
- Directed by Ray Austin
- Written by Johnny Byrne
- Produced by Gerry Anderson (Executive Producer) and Sylvia Anderson (Producer)
- Music by Barry Gray
- Cinematography by Frank Watts (Director of Photography)
- Film Editing by Derek Chambers (As Derek Hyde Chambers)
- Supervising Editor David Lane (As Dave Lane)
- Casting by Michael Barnes
- Production Design by Keith Wilson
- Hair Design by Helene Bevan
- Makeup by Basil Newall
- Production Manager: Ron Fry
- Assistant Director: Ken Baker
- Scenic Artist: Bill Beavis
- Props John Chisholm
- Sound Department
- David Bowen (Sound Recordist)
- Peter Pennell (Sound Editor)
- Special Effects
- Nick Allder (Special Effects Director)
- Michael S.E. Downing (Electronics)
- Frank Drake (Camera Operator)
- Brian Johnson (Special Effects)
- Harry Oakes (Lighting Cameraman)
- Andrew Kelly (Model Maker (Uncredited)
- Camera And Electrical Department
- Neil Binney (Camera Operator)
- Costume And Wardrobe Department
- Rudi Gernreich (Costumes: Moon City)
- Eileen Sullivan (Wardrobe)
- Music Department
- Vic Elms (Associate)
- Alan Willis (Music Editor)
- Script And Continuity Department
- Gladys Goldsmith (Continuity}
- Transportation Department
- Ray Atkins, Steve Smith and Doug Wetherley: Drivers (Uncredited)
- Additional Crew
- Christopher Penfold (Story Consultant)
- Alan Meacham Stand-In: Martin Landau (Uncredited)
- Lou Morgan Stand-In: Peter Bowles (Uncredited)