18:45Doctor Who (1963–1996)Season 21The Twin Dilemma: Part 4BBC One Duration: 25 minutes Audio described Signed Fri 30th Mar 1984, 18:45 on BBC One Northern IrelandAvailable for yearsWatch nowMestor's true plan is revealed and the Doctor's old Gallifreyan friend Azmael comes to the realisation that he has been corrupted long enough by the Gastropod leader...GenresDramaSciFi & FantasyBrandDoctor Who (1963–1996)SeriesDoctor Who (1963–1996): Season 21 Source: BBC Online