The Tardis, carrying the Doctor (Tom Baker) and his new companion Leela (Louise Jameson), arrives aboard a huge sandminer on a deserted world. The small human crew rely almost entirely on robots to carry out their every task and whim while they mine the planet's rich minerals. Suddenly, one by one, members of the team start to disappear. The time travellers discover that someone or something is murdering the sandminer crew - but, of course, nobody believes it could possibly be the robots...
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