The TARDIS arrives on the planet Marinus on an island of glass surrounded by a sea of acid. The travellers are forced by the elderly Arbitan to retrieve four of the five operating keys to a machine called the Conscience of Marinus, of which he is the keeper. These have been hidden in different locations around the planet to prevent them falling into the hands of the evil Yartek and his Voord warriors, who plan to seize the machine and use its originally benevolent mind-influencing power for their own sinister purposes.
Genres:
William Hartnell as The Doctor
Carole Ann Ford as Susan Foreman
Jacqueline Hill as Barbara Wright
William Russell as Ian Chesterton
George Coulouris as Arbitan
Martin Cort as Voord / Warrior / Ice Soldier / Aydan
Peter Stenson as Voord / Ice Soldier / Second Judge
Gordon Wales as Voord
Robin Phillips as Altos
Katherine Schofield as Sabetha
Heron Carvic as Voice of Morpho (voice)
Edmund Warwick as Darrius
Francis de Wolff as Vasor
Michael Allaby as Ice Soldier / Larn
Alan James as Ice Soldier / First Judge / Guard
Anthony Verner as Ice Soldier
Henley Thomas as Tarron
Raf De La Torre as Senior Judge
Fiona Walker as Kala
Donald Pickering as Eyesen
Stephen Dartnell as Yartek
Dougie Dean as Eprin (uncredited)
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