Hanging by a Thread: The Making of Logopolis is a documentary about the production of the Doctor Who story, Logopolis, which aired in 1981. It is part of the Season 18 Blu-ray collection of Doctor Who. The documentary explores the challenges and complexities faced during the filming of the story, including the transition from Tom Baker to Peter Davison

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Main Cast: Tom Baker, Matthew Waterhouse, Janet Fielding, Sarah Sutton, Adrian Gibbs, Christopher H. Bidmead, Margot Heyhoe, June Hudson, Paddy Kingsland, Malcolm Thornton

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