Time Lords

They are an ancient civilisation of a humanoid species. They were the oligarchic rulers of the planet Gallifrey,

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The Time Lords had rewarded The Doctor with extra regenerations for ending the Last Great Time War and saving Gallifrey. Thus allowing The 12th Doctor to exist.

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Time Lords have been said to only be able to regenerate 12 times. But it's really limited by the politicians of Gallifrey.

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Each hemisphere of a Time Lords' brain controls that half of their body, as opposed to how each hemisphere of a human's brain controls the opposite side.

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