Searching for the third segment to the Key to Time brings the Doctor and Romana to present-day Earth, where the travellers have to contend with stone circles, Druidic rituals and a not-so-mythical goddess known as the Cailleach.

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Main Cast: Tom Baker, Mary Tamm, John Leeson, Beatrix Lehmann, Susan Engel, Nicholas McArdle, Elaine Ives-Cameron

Director: Darrol Blake

Writer: David Fisher

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