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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…
Length 100 minutes
Tom Baker | Ewen Solon | Frederick Jaeger | Louis Mahoney | Elisabeth Sladen | Prentis Hancock | Michael Wisher | Graham Weston | Terence Brook | Tony McEwan | Haydn Wood | Melvyn Bedford