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.
The Doctor
Jamie McCrimmon
Victoria Waterfield
Clent
Penley
Miss Garrett
Storr
Davis
Arden
Walters
Voice of the Computer
Varga
Zondal
Turoc
Isbur
Rintan
