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In the third episode of the four-part story "The Robots of Death," the Doctor (Tom Baker) tries to clear himself and Leela (Louise Jameson) of murder accusations while onboard the huge mining-refining vehicle Sandminer. Investigating the killings, the Doctor is puzzled by the fact that each of the bodies has a red corpse-marker on it -- suggesting that the murders were preprogrammed. And what should be made of the fact that one of the robotic crew members of the Sandminer has suddenly developed the powers of speech? Written by Chris Boucher, "The Robots of Death, Episode 3" first aired on February 12, 1977.