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.

Cast:Patrick Troughton, Frazer Hines, Deborah Watling, Peter Barkworth, Peter Sallis, Wendy Gifford,

Genre:Drama, Adventure, Science Fiction,

country:United Kingdom,

Production:BBC,