
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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