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The Doctor and Romana learn the second segment of the Key to Time is on the planet Calufrax. Yet they arrive on a planet called Zanak, which has been hollowed out and fitted with hyperspace engines, allowing its insane, half-robot Captain to materialise it around smaller planets and plunder their resources.
Length 100 minutes
Tom Baker | Mary Tamm | John Leeson | Bruce Purchase | Andrew Robertson | Rosalind Lloyd | David Warwick | David Sibley | Ralph Michael | Primi Townsend