17:45Doctor Who (1963–1996)Season 13The Android Invasion: Part 4BBC One Duration: 25 minutes Audio described Signed Sat 13th Dec 1975, 17:45 on BBC One East MidlandsAvailable for yearsWatch nowThe Doctor and Sarah are desperate to warn UNIT of the alien invasion, but nobody will believe them. The Kraals' release their android duplicates, including one of the Doctor.GenresDramaSciFi & FantasyBrandDoctor Who (1963–1996)SeriesDoctor Who (1963–1996): Season 13 Source: BBC Online