"Force of Life" is the ninth episode of the first series of Space: 1999. The screenplay was written by Johnny Byrne; the director was David Tomblin. The original title was "Force of Evil". The shooting script is dated 15 May 1974; the final shooting script is dated 24 May 1974. Live-action filming began Wednesday 29 May 1974 through Friday 7 June 1974. After a three-week hiatus, filming resumed Monday 1 July 1974 through Friday 5 July 1974; the hiatus was planned, as the Landaus' contract guaranteed them time off for a summer holiday. Story The body of Anton Zoref is invaded by an unknown life-force. The man soon manifests an uncontrollable ability to absorb heat. As the Alphans struggle to understand this mysterious force, Zoref's need becomes insatiable. Driven by instinct, he freezes Mark Dominix, Hilary Preston and the security guard dead until he makes his way to the greatest source of heat on Alpha— one of its Nuclear Generating Plants. As Zoref himself is killed by a hand laser to prevent him from attacking Commander Koenig, the laser only strengthens the starving force long enough to enable it to enter on of Alpha's reactor cores and feed off of the power of the nuclear energy generating plant. This causes a massive explosion. The force leaves Moonbase Alpha and Eva, Anton's wife, grieves as she thinks about her life with Zoref. Cast Starring Martin Landau — Commander John Koenig Barbara Bain — Doctor Helena Russell Also Starring Barry Morse — Professor Victor Bergman Guest Star Ian McShane — Anton Zoref Guest Artist Gay Hamilton — Eva Zoref Featuring Prentis Hancock — Controller Paul Morrow Clifton Jones — David Kano Zienia Merton — Sandra Benes Anton Phillips — Doctor Bob Mathias Nick Tate — Captain Alan Carter John Hamill — Mark Dominix Eva Rueber-Staier — Jane Uncredited Artists Suzanne Roquette — Tanya Lea Dregorn — Hilary Preston Tony Allyn — Security Guard Sarah Bullen — Kate Barbara Kelly — Computer Voice Music To highlight the utterly alien nature of the unknown life-force, the regular Barry Gray score was replaced by abstract electronic compositions drawn from the music library. Those featured were 'Cosmic Sounds No. 1', 'Cosmic Sounds No. 2' and 'Cosmic Sounds No. 3' by Georges Teperino and 'Videotronic No. 3' by Cecil Leuter. Another synthesised music track, 'The Latest Fashion' by Giampiero Boneschi, was used as the piped music heard