Picking up a distress call from the edge of the known universe, the Doctor and Sarah Jane find themselves on Zeta Minor where a geological team has run afoul of some strange goings on...

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Main Cast: Tom Baker, Elisabeth Sladen, Frederick Jaeger, Ewen Solon, Prentis Hancock, Graham Weston, Louis Mahoney, Michael Wisher, Terence Brook, Tony McEwan

Director: David Maloney

Writer: Louis Marks

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Cinematographer:

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