 However, within a specific incarnation, a Time Lord is able to age, albeit much more slowly than a human.The War Doctor and Eleventh Doctor,<ref name="totd"></ref> over the course of the Last Great Time War and the Battle of Trenzalore, respectively, are seen to age within their respective incarnations to what would appear to a human to be old age; both conflicts are suggested within the series to last hundreds if not thousands of Earth years.In "The Daleks' Master Plan",<ref></ref> the First Doctor is able to resist the effects of the Time Destructor better than his companions, who are visibly aged by it; one of them, Sara Kingdom, ages to dust before the Destructor device can be reversed.