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In the second episode of the four-part story "Underworld," the Doctor (Tom Baker) has his doubts concerning the avowed mission of the Minyan spacecraft R1C. According to Commander Jackson (James Maxwell), the R1C crew is in search of their sister ship P7E, containing the Minyans' "race bank," with which they hope to repopulate their dying, war-ravaged planet. Though Jackson is telling the truth, he doesn't know that the R1C is being lured into a trap. First telecast January 11, 1978, "Underworld, Part 2" was written by Bob Baker and Dave Martin.