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.
Derek Martinus
Director
Brian Hayles
Writer
Patrick Troughton
The Doctor
Frazer Hines
Jamie McCrimmon
Deborah Watling
Victoria Waterfield
Peter Barkworth
Clent
Peter Sallis
Penley
Wendy Gifford
Miss Garrett
Angus Lennie
Storr
Peter Diamond
Davis
George Waring
Arden
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