The Doctor and Adric learn from the wizened Keeper of Traken that a great evil has come to his planet in the form of a Melkur - a calcified statue. The Keeper of Traken is nearing the end of his reign and seeks the Doctor's help in preventing the evil from taking control of the bioelectronic source that is the keystone of the Traken Union's civilisation.

Genres

Cast

Tom Baker

The Doctor

Matthew Waterhouse

Adric

Sarah Sutton

Nyssa

Geoffrey Beevers

Melkur (voice) / The Master

Anthony Ainley

Tremas / The Master

Sheila Ruskin

Kassia

John Woodnutt

Seron

Robin Soans

Luvic

Graham Cole

Melkur