"Doctor Who" is a British Broadcasting Corporation series following the adventures of a mysterious time-traveller known only as "the Doctor" and the various companions who travel with him. It is among the world's longest-running science-fiction television series and has a worldwide fan following. The show began in 1963 and ran for 26 seasons until it was put "on hiatus" (and not officially cancelled) in 1989; a television movie was made in 1996. While it was off the air, books and audio dramas continued the Doctor's adventures. The programme was relaunched in 2005, with a full season and a Christmas special each year through 2008, four specials in 2009, and a fifth series in 2010 - 2014. Actors who have played the Doctor are:  William Hartnell,  Patrick Troughton,  Jon Pertwee,  Tom Baker,  Peter Davison,  Colin Baker,  Sylvester McCoy,  Paul McGann,  Christopher Eccleston,  David Tennant,  Matt Smith, and  Peter Capaldi.
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BBC One: Doctor Who
Official website provides news, episode guide, video clips, image galleries, characters, monsters, games and DW50 guide.
Tardis Data Core, the Doctor Who Wiki
Wikia encyclopedia extensively covering stories, characters, technology, locations and species for Doctor Who, Torchwood, Sarah Jane and K9.
The ?-Mark Doctor Who Page
A concise guide to the first 8 Doctors.
Alden's Doctor Who Page
New Zealand site offering news, local fan club information, a guide to the audio adventures, fan fiction and a Mel Bush appreciation section.
BBC America: Doctor Who
Official website for the television series featuring videos, images, cast bios, premiere information and trailers.
The Blue Box Project
Instructions for building a TARDIS from the series.
Defending the Earth
Games and puzzles, with a special section devoted to unmasking the true identity of the mysterious character known as "The Doctor".
Doctor Who Answers
A questions and answers wiki on the series and spin-offs.
Doctor Who Dynamic Rankings
An ongoing survey of on-line fandom's likes and dislikes, including favourite episodes and Doctors.
Doctor Who Online
Offers news and reviews, with forums, episode guides, audio interviews and links.
Doctor Who Products
Reviews and discussion on products about the series.
Doctor Who Scarf
Describes how to recreate the 4th Doctor's scarf. Includes instructions, a guide to yarns, knitting patterns and photographs.
Doctor Who: A Brief History of Time (Travel)
Offers news, episode details, and features about the show and its spin-offs.
Doctor Who: Devious
Amateur film producers. Contains production notes, galleries, movie clips and news about the project Halfway to Oblivion, featuring a cameo performance by Jon Pertwee.
The Earthbound TimeLords
An academic research site devoted to the series.
Eye of Horus
Fan enterprise offering detailed plot synopses, episode and DVD reviews, articles, interviews, merchandise and details of the Big Finish audio productions.
The Guardian - Doctor Who
Ongoing collected coverage includes news, features, interviews, blogs, notes and queries.
IMDb: Doctor Who
Offers a synopsis, cast and crew list, user comments, a message board and links.
Former series consultant Ian Levine's suite of discussion forums covering a variety of Doctor Who related topics.
Radio Free Skaro
A podcast about the series news and episodes.
Original artwork, recent convention photographs and exclusive online comic adventures.
Tabula Rasa: Doctor Who
A collection of stories and articles concentrating on the seventh Doctor and the darker aspects of the show.
The TARDIS Library
Information on the show's TARDIS props and the real police boxes that inspired them, along with details on fan replicas and a guide to building your own.
The TARDIS Rebuilders
Message board for fans interested in constructing replicas.
Features puzzles, polls, bloopers, a list of books, DVDs, videos and audios.
TV.com: Doctor Who
Contains cast and crew information, episode guides, news and links.
An illustrated guide to the Doctor Who books published by Virgin Publishing during the 1990s.
Who's Doctor Who?
Offers a biography and chronology of the Doctor.
Computer generated artwork, tutorials, downloads, news and a forum.
Weekly articles on all aspects of the series.
Wikipedia: Doctor Who
Features the history of the Doctor and his companions, as well as information about the various aliens and villains that have featured throughout the series.