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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BBC
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United Kingdom
Astro
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Date: 2013-12-20T21:28:33.000Z
Doctor Who | The Key to Time (Season 16) Trailer | Tom Baker