Broadcast: Tuesday 30th January, 1979: 7.20pm-8.10pm, BBC 1
Writer: Allan Prior
Director: Jonathan Wright Miller
"I'm glad you're coming round to the truth, Ro. It would have hurt me to eliminate you." Kommissar
Horizon was commissioned from award-winning novelist and television scripwriter Allan Prior in early 1978.
Horizon was originally intended to be episode 8 in Series B but was moved forward to 4 to replace Pip & Jane Baker’s abandoned script Death Squad.
Horizon originally didn’t include Gan who would already have died if the episode had retained its place later in the season.
The surface scenes on Horizon were filmed at Clearwell, Gloucestershire, from 10th-12th August, 1978.
The freighter followed by the Liberator was stock footage of the London from Series A, as were the Federation fighters.
Deleted scenes included Vila begging for soma before teleporting down to Horizon and a long speech by the Kommissar to Ro.
The main guest actor in Horizon was William Squire who had appeared as a regular in the spy series Callan.
Squire was also the voice of Gandalf in the animated version of The Lord of the Rings (1978) and was the Shadow in The Armageddon Factor (Doctor Who, 1979).
RADIO TIMES: Fleeing from pursuit ship patrols. Blake takes the Liberator far out towards the edge of the galaxy. But even here he is not free of the Federation. On a planet code-named ' Horizon' he is finally captured...
Kommissar - William Squire
Ro - Darien Angadi
Selma - Souad Faress
Assistant Kommissar - Brian Miller
Chief Guard - Paul Haley
Production Assistant - Ralph Wilton
Production Unit Manager - Sheelagh Rees
Film Cameraman - Peter Chapman
Film Recordist - Ian Sansam
Film Editor - Sheila S. Tomlinson
Series Videotape Editors - Sam Upton (Uncredited), Malcolm Banthorpe (Uncredited)
Visual Effects Designer - Mat Irvine, Peter Pegrum, Andrew Lazell
Electronic Effects - A.J. Mitchell
Studio Lighting - Brian Clemett
Studio Sound - Clive Gifford
Special Sound - Richard Yeoman-Clark
Costume Designer - June Hudson
Make Up Artist - Marianne Ford
Music By - Dudley Simpson
Series Created By - Terry Nation