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Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a mysterious alien time-traveller known as "the Doctor" who travels in his space and time-ship, the TARDIS, which appears from the exterior to be a blue police box. With his companions, he explores time and space, solving problems, facing monsters and righting wrongs.

Viewing Doctor Who Season 4 Episode 11: Turn Left

Donna's entire world collapses, but there's no sign of the Doctor. Instead, she finds help from a mysterious blond woman – a traveler from a parallel universe.