Ηθοποιοί επεισοδίου
William HartnellThe Doctor
Carole Ann FordSusan Foreman
William RussellIan Chesterton
Jacqueline HillBarbara Wright
Ilona RodgersCarol
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Stephen DartnellJohn
Peter GlazeThird Sensorite
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Arthur NewallFourth Sensorite
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Bartlett MullinsSecond Elder
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Anthony RogersSensorite
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Eric FrancisFirst Elder
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Gerald MartinSensorite
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Ken TyllssenFirst Scientist
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Joseph GreigWarrior