Doctor Who is a British sci-fi television programme produced by the BBC. First airing in 1963 featuring William Hartnell as the Doctor, the series has featured a number of actors in the lead role. Currently Peter Capaldi is the Doctor, but he is due to bow out of the role following the end of series 10 and the Christmas special. The Doctor usually travels with companions - his latest, Bill Potts, played by Pearl Mackie, is to be introduced at the start of series 10. Doctor Who has an extensive history, below you can find episode guides and reviews for every episode ever made.