18:25Doctor Who (1963–1996)Season 16The Armageddon Factor: Part 5BBC One Duration: 25 minutes Audio described Signed Sat 17th Feb 1979, 18:25 on BBC One ScotlandAvailable for yearsWatch nowThe Doctor and Romana arrive in the lair of the Shadow, servant of the Black Guardian, who also seeks the Key to Time.GenresDramaSciFi & FantasyBrandDoctor Who (1963–1996)SeriesDoctor Who (1963–1996): Season 16 Source: BBC Online