Doctor Who: The Keys of Marinus

The story

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.

Cast

W William HartnellThe Doctor C Carole Ann FordSusan Foreman J Jacqueline HillBarbara Wright W William RussellIan Chesterton G George CoulourisArbitan M Martin CortVoord / Warrior / Ice Soldier / Aydan P Peter StensonVoord / Ice Soldier / Second Judge G Gordon WalesVoord R Robin PhillipsAltos K Katherine SchofieldSabetha H Heron CarvicVoice of Morpho (voice) E Edmund WarwickDarrius

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F Francis de WolffVasor M Michael AllabyIce Soldier / Larn A Alan JamesIce Soldier / First Judge / Guard A Anthony VernerIce Soldier H Henley ThomasTarron R Raf De La TorreSenior Judge F Fiona WalkerKala D Donald PickeringEyesen S Stephen DartnellYartek D Dougie DeanEprin (uncredited)