Pennant Roberts Director Charles Norton Director, Producer Tom Baker The Doctor Actor Lalla Ward Romana Voice Christopher Neame Skagra Voice Denis Carey Professor Chronotis Actor Daniel Hill Chris Parsons Voice Victoria Burgoyne Clare Keightley Voice David Brierly K9 Voice Gerald Campion Wilkin Actor Shirley Dixon The Ship Voice Derek Pollitt Caldera Actor James Coombes The Krargs Voice John Hallet Police Constable Actor Douglas Adams Writer Tariq Anwar Film Editing Mark Ayres Original Music Rupert Jarvis Costume Design