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Zero (disambiguation)for other, similarly-named pages.
Zero was a Lord Cardinal of the High Council of the Time Lords. Like the Doctor, he was a Prydonian. He was a member of the Council of the Great Mother, and specialised in the politics of regeneration.
He had a very dry wit and enjoyed using jokes, for example after regenerating into one of the avian species and causing the Doctor to flee all according to his plan, he commented that he "had hit two birds with one stone".
He regenerated into one of the native avian species on the planet he was living on in his exile after dying from touching the Yolk of Darts plant.