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.
Patrick Troughton , Frazer Hines , Deborah Watling , Peter Barkworth , Peter Sallis , Angus Lennie , Peter Diamond , George Waring , Roy Skelton , Bernard Bresslaw
BBC
