The TARDIS arrives on Earth in a new ice age. The travellers make their way into a base where scientists, commanded by Leader Clent, are using an ioniser device to combat the advance of a glacier.

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Main Cast: Patrick Troughton, Frazer Hines, Deborah Watling, Peter Barkworth, Peter Sallis, Wendy Gifford, Angus Lennie, Peter Diamond, George Waring, Malcolm Taylor

Director: Derek Martinus

Writer: Brian Hayles

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Cinematographer:

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