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In the conclusion of the six-part episode "Planet of the Daleks," the revived Dalek warriors prepare to launch their campaign to conquer the Universe from their new home base on the planet Spiridon. Though it may be too late, the Doctor hopes to prevent this cataclysmic event with the strategic application of a powerful bomb -- not to mention the assistance of a group of Thals, who have a trick or two up their sleeves as well. Written by Terry Nation, "Planet of the Daleks, Episode 6" first aired on May 12, 1973.