Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a Time Lord, a time-travelling, humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior appears as a blue police box from 1963 London, when the series first aired. Along with a succession of companions, he faces a variety of foes while working to save civilisations, help people, and right wrongs.