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In the third episode of the four-part story "Underworld," the Minyan space ship R1C has located its sister ship P7E, containing the "race bank" with which the ancient Minyan astronauts hope to revitalize their race. Alas, the P7E is under control of a malevolent computer, which has no intention of yielding its race banks. In fact, unless the Doctor (Tom Baker) acts quickly, everyone on board the R1C will perish -- including the Doctor and his companion Leela (Louise Jameson. First telecast January 18, 1978, "Underworld, Part 3" was written by Bob Baker and Dave Martin.