The Twelfth Doctor is a Time Lord from planet Gallifrey.
Gallifrey ( [ ˈɡælᵻfreɪ ] or [ ˈɡælᵻfriː ] ) is a planet in the long-running British science fiction television series Doctor Who . In the long running British science fiction television series Doctor Who , regeneration is a biological ability exhibited by the Time Lords , a race of fictional humanoids originating on the planet Gallifrey . Time Lord . Originally they were described as a powerful and wise race from the planet Gallifrey , from which the Doctor was a renegade ; details beyond this were very limited for the first decade of the series . Twelfth Doctor . Within the series ' narrative , the Doctor is a time travelling , humanoid alien from a race known as the Time Lords .