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In the fourth episode of the six-part story "Genesis of the Daleks," the Doctor (Tom Baker) and his friends are still stranded on the war-ravaged planet Skaros, sometime in the distant past. Their principal nemesis is Kaled scientist Davros (Michael Wisher), who alone possesses knowledge of the mutation process that will eventually create the dreaded Daleks. Welcoming this disastrous metamorphosis, Davros intends to use whatever means possible to prevent the Doctor from destroying the Daleks before they can be unleashed on the universe. First telecast on March 28, 1975, "Genesis of the Daleks, Episode 4" was written by Terry Nation.