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"A sort of formless, shapeless thing floating about in space like a cloud of mist, only with a mind and will!"
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In order to escape an attack in space, the TARDIS makes an unscheduled landing and ends up deep inside the London Underground. Here the travellers soon find themselves engulfed in a thrilling battle with the Great Intelligence and the Yeti, a deadly enemy set to invade the Earth. But as events take a turn for the worse, it becomes clear that the golden prize is not just the Earth, but the Doctor's mind too...
The Doctor: Patrick Troughton
Jamie McCrimmon: Frazer Hines
Victoria Waterfield: Deborah Watling
Professor Edward Travers: Jack Watling
Colonel Lethbridge-Stewart: Nicholas Courtney
Anne Travers: Tina Packer
Captain Knight: Ralph Watson
Harold Chorley: Jon Rollason
Staff Sgt. Arnold: Jack Woolgar
Driver Evans: Derek Pollitt
Producer: Peter Bryant
Director: Douglas Camfield
Scriptwriters: Mervyn Haisman and Henry Lincoln