The Armageddon Factor: Part Four
Doctor Who: Season 16, Episode 24
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With the Marshal poised to fire upon Zeos and the Mentalis computer on a countdown to destruction, the Doctor resorts to desperate measures to prevent a cataclysm.
Show: Doctor Who
Written by: Bob Baker and Dave Martin
Air date: February 10, 1979
Director: Michael Hayes
First broadcast: 20 January – 24 February 1979
Script editor: Anthony Read; Douglas Adams (uncredited)