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Xastaroth, aka X, is a Time Lord, created by Simon Birch. He was Alban's tutor and, later, joined him in exile from Gallifrey. His name evokes that of the demon Astaroth, although he was generally genially befuddled, rather than malevolent. He appears in The Testament of a Time Lord and Nomads of the Timestreams. He also appears in the spoof The Five Doctors.

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