Possible Clues:

• BBC time traveler
• Time-traveling TV character
• Hit BBC series since 1963, informally
• Last of the Time Lords
• BBC sci-fi classic
• TV time traveler
• Show featuring an alien from the planet Gallifrey
• '___ and the Daleks' (1965 sci-fi film)
• One travelling in time: how?
• 'Torchwood' was spun off from it