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.
Tom Baker , Matthew Waterhouse , Sarah Sutton , Geoffrey Beevers , Anthony Ainley , Sheila Ruskin , John Woodnutt , Robin Soans
BBC
