Doctor Who is a British science fiction television programme produced by the British Broadcasting Corporation (BBC). The programme depicts the adventures of a mysterious, humanoid alien known as the Doctor who travels through time and space in his spacecraft, the TARDIS (an acronym for Time And Relative Dimensions In Space), which normally appears from the exterior to be a blue 1950s British police box. With his companions, he explores time and space, faces a variety of foes and rights wrongs.

Source: Wikipedia.org