Season 0 - Episode 344

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Louise Jameson (Leela), Colin Baker (The Doctor), Katy Manning (Jo), Sarah Sutton (Nyssa), Janet Fielding (Tegan), Matthew Waterhouse (Adric), Betsan Roberts (wife of late director Pennant Roberts), and Toby Hadoke get to grips with a mysterious skull, an alien menace, and a priory full of mad scientists.