| Episode | Credits | Transcript |
Cast[]
- Martin Landau as Commander John Koenig
- Barbara Bain as Dr. Helena Russell
- Catherine Schell as Maya
- Tony Anholt as Tony Verdeschi
- Willoughby Goddard as Taybor
- Jeffery Kissoon as Dr. Ben Vincent
- John Hug as [[Fraser
- Yasuko Nagazumi as Yasko
- Laraine Humphrys (Credited as Larraine Humphrys) as Karen
- Rita Webb as Slatternly Woman
- Mel Taylor as Andrews
- Sarah Bullen as Kate
- Vicki Michelle as Barbara
- Jenny Clare, Chai Lee, Penny Priestley as Sunbathing Alphans -
- Micky Clarke as Medic/White Haired Alphan
- Glenda Allen as Technician L Picard
Crew[]
- Directed by Bob Brooks
- Written by Thom Keyes
- Produced by Gerry Anderson (Producer), Fred Freiberger (Producer), F. Sherwin Green (Associate producer)
- Music by Derek Wadsworth
- Cinematography by Frank Watts
- Editing by Alan Killick
- Casting by Lesley De Pettit (Credited as Lesley de Pettitt)
- Production Design by Keith Wilson
- Costume Design by Emma Porteous
- Jairdressers: Jan Dorman and Jeanette Freeman (Credited as Jeannette Freeman)
- Makeup Artists: Basil Newall and Connie Reeve
- Production Manager: Donald Toms
- Assistant Director: Robert Lynn
- Second Unit Director: David Lane
- AssistantArt Director: Michael Ford
- Construction Manager: Bill Waldron
- Sound Supervisor: Roy Baker
- Sound Recording: Claude Hitchcock
- Sound Editors: Jack T. Knight, Peter Pennell
- Rerecording Mixer: Otto Snel
- Special Effects by Nick Allder (Lighting cameraman), Michael S.E. Downing (Electronics), Brian Johnson (Special effect designer / special effects director), David Litchfield Camera Operator), Andrew Kelly (Model Maker)
- Visual Effects by Martin Bower
- Camera Operator: Neil Binney
- Gaffer: John May
- Wardrobe: Masada Wilmot
- Music Editor: Alan Willis
- Continuity: Gladys Goldsmith
- Drivers (Uncredited): Ray Atkins, Steve Smith and Doug Wetherley
- Financial Director: Terence Connors
- Production Executive: Reg Hill
- Technical Director: David Lane