The Seance Spectre  "The Seance Spectre" is the twentieth episode of the second series of "" (and the forty-fourth overall episode of the programme). The screenplay was written by Donald James; the director was Peter Medak. The original title was "The Mutiny". The final shooting script is dated 16 September 1976. Live-action filming took place Monday 18 October 1976 through Saturday 30 October 1976. It is 2012 days after leaving Earth orbit, and is operating under strict security protocols. Three weeks ago, a celestial body was sighted and given the code-name 'Tora'. Long-range analysis proved inconclusive, but within twenty-four hours the Moon will be in range to determine whether it is a habitable planet. Not wanting to raise false hope, has ordered all knowledge of Tora classified. is off-limits to all but senior executives and access to the information channels by the general population has been restricted. In the Recreation Centre, Greg Sanderson is ranting about the restrictions. Once Alpha's finest surface-exploration team leader, he has degenerated into a loud-mouthed malcontent. Controlling his team (Cernik, Stevens and girlfriend Eva) with a Svengali-like charisma, he presents his latest conspiracy theory—how the Alpha elite are hiding the fact the Moon is approaching a habitable planet. Marching on Command Centre, Sanderson breaks in and stuns the executive staff. As he views Tora, he declares the irregular mass of dust and gas to be a planet. Another 'astro-prediction' will be required to determine its habitability. Locking the door, the four join hands in a séance-like ring and concentrate. Koenig and Alan Carter are flying reconnaissance. Observations show that the Tora formation is shifting position—the mutual attraction between it and the Moon has locked them on a collision course. When Koenig tries to radio in the forecast, there is no response. The four mutineers have slipped into a hypnotic trance and Sanderson's prophesies of a habitable planet drown out the Commander's warning. Returning to base, Koenig retakes Command Centre and confines Sanderson and company to Medical. Helena Russell reports the trance was the result of autohypnosis. The underlying cause of their behaviour is 'greensickness': a mental condition in which subconscious tensions are generated by a prolonged existence in an artificial environment. In extreme cases, these tensions manifest a psychological craving for contact with nature, resulting in disorientation and hallucinations.