|The Full Circle|
|Teleplay by||Jesse Lasky Jnr, Pat Silver|
|Airdate||Jan. 30, 1976|
|Guest Star(s)|| Spearman - Oliver Cotton|
Main Mission Operatives - Sarah Bullen, Andrew Dempsey, Annie Lambert, Robert Philips, Michael Stevens
Security Guard - Tony Allyn
Nurse - Chai Lee
Caveman - Alan Meacham
|Episode Production Order|
|Previous||Death’s Other Domain|
|Next||End of Eternity|
|Episode Transmission Order|
|Next||Another Time Another Place|
While exploring an Earth-type world several Alphans, including Commander Koenig and Dr. Russell, disappear after sighting a strange fog. Shortly afterwards a race of primitive humans are encountered.
- Tuesday, September 24th - Tuesday, October 8th, 1974
- Scenes on the planet Retha were shot on the backlot at Pinewood Studios and in Black Park next door - this was the only location filming during Space:1999's first season and the only exterior filming apart from the rainfall sequence in The Last Sunset.
- Director Bob Kellett reports that Barbara Bain relished the opportunity to "get down and dirty" in her cavewoman persona and would spend lunchtimes in her trailer practising her animal-like screaming.
- The percussive incidental music featured in this episode was Barry Gray's final contribution to the series, and his last work for Gerry Anderson.
Information from IMDB and Fanderson website