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The First Doctor's gradual downfall constituted a story arc that stretched across four stories and eleven episodes. In "The Daleks' Master Plan", he is aged a century by the Time Destructor, in The Celestial Toymaker he is overexerted facing the Mandarian, in "The Savages", he is drained of his life-force, and loses the rest in "The Tenth Planet", when the Cybermen drain Earth's energy to replenish that of their own world.