Doctor Who is a long-running British sci-fi TV show produced by the BBC. It follows the adventures of a Time Lord known as the Doctor who travels through time and space in his ship called the TARDIS. There have been two different series - the original series from 1963-1989 and the new series starting in 2005 which is still ongoing. Over the course of the series, there have been 11 different actors who have portrayed the Doctor, each with their own companions as they battle recurring foes like the Daleks and Cybermen.