

16/05/1964
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.

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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