
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
The Doctor

Carole Ann Ford
Susan Foreman

Jacqueline Hill
Barbara Wright



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May 16, 1964
2h 30m
5.9
John Gorrie
Terry Nation
12


BBC
GB
William Russell
Ian Chesterton

George Coulouris
Arbitan

Martin Cort
Voord / Warrior / Ice Soldier / Aydan

Peter Stenson
Voord / Ice Soldier / Second Judge

Gordon Wales
Voord

Robin Phillips
Altos

Katherine Schofield
Sabetha
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