"Doctor Who" is the longest sci-fi television series in the world [1], three times included in the Guinness Book of Records (as the longest [1] and the most successful sci-fi project according to the number of viewers, book sales and illegal downloads, and the special issue " Doctor's Day ", dedicated to the 50th anniversary of the series, was included in the book for the largest simultaneous display of TV drama [2]). As of June 24, 2017, the series contains 36 seasons and 838 episodes, including a television film, combined in 275 series. In addition, mini-episodes were shot, cartoons and series of games were released.
