Doctor Who is a long-running, award-winning British science fiction television programme produced by the BBC. The programme depicts the adventures of a mysterious alien time-traveller known as "the Doctor" who travels in his space and time-ship, the TARDIS, which appears from the exterior to be a blue police phone box. With his companions, he explores time and space, solving problems and righting wrongs.

The programme is listed in Guinness World Records as the longest-running science fiction television show in the world and is also a significant part of British popular culture. It has been recognised for its imaginative stories, creative low-budget special effects during its original run, and pioneering use of electronic music (originally produced by the BBC Radiophonic Workshop). In Britain and elsewhere, the show has become a cult television favourite and has influenced generations of British television professionals, many of whom grew up watching the series. It has received recognition from critics and the public as one of the finest British television programmes, including the BAFTA Award for Best Drama Series in 2006.

The programme originally ran from 1963 to 1989. A television film was made in 1996 as a backdoor pilot for a new series (which never entered production), and the programme was successfully relaunched in 2005, produced in-house by BBC Wales. Some development money for the new series is contributed by the Canadian Broadcasting Corporation (CBC), which is credited as a co-producer. Doctor Who has also spawned spin-offs in multiple media, including the current television programmes Torchwood and The Sarah Jane Adventures.

The show's lead character is currently portrayed by David Tennant. A Christmas special co-starring Kylie Minogue aired in December 2007, and a fourth series, scheduled to air in 2008, is in production. For that series, Catherine Tate will reprise her role of Donna Noble, from the 2006 Christmas special, as the Doctor's latest companion. Midway through the series, Freema Agyeman will also return to her role of Martha Jones, following a multi-episode guest appearance in the Doctor Who spin-off series, Torchwood. John Barrowman is to film for the show after Christmas 2007, continuing his role as Captain Jack Harkness, and Billie Piper will return as Rose Tyler for three episodes.

After a 2008 Christmas special and three further specials starring David Tennant, scheduled to air in 2009, Doctor Who is planned to return in 2010 for a fifth full length series.

Doctor Who (unofficially called Enemy Within by Philip Segal, the film's executive producer) is a television movie based on the British science fiction television series Doctor Who. Developed as a co-production between Universal Television, BBC Television, BBC Worldwide, and the Fox Network, The 1996 television film premiered on 12 May 1996 on CITV in Edmonton, Alberta, fifteen days before the BBC One showing, and two days before it aired on Fox in the US. The film was the first attempt to revive Doctor Who, the original series having ended in 1989. It was intended as a back door pilot for a new American-produced Doctor Who TV series, and introduced Paul McGann as the Eighth Doctor in his only television appearance. Despite being a ratings winner in the United Kingdom, the film did not fare well on American television, and no new series was purchased. The series was later relaunched on the BBC in 2005. The production was filmed in Vancouver, British Columbia, the first and only time any episode of Doctor Who was filmed in Canada.

The Doctor is a renegade Time Lord: an eccentric, highly-intelligent scientist from a distant planet. He travels through time and space in the TARDIS, a curious device, larger on the inside than on the outside, which was designed to change its appearance to suit its surroundings. Unfortunately, the Doctor's TARDIS seems to be broken, and always appears as a blue British police box. The Doctor has a soft spot for the planet Earth, and often visits there, either to save it from various alien threats or to whisk a choice few inhabitants away to the distant parts of the galaxy to help him fight evil there. The Doctor has many foes, including Daleks (led by Davros), and The Master, another renegade Time Lord. Time Lord biology enables them to regenerate their bodies, and so both the Doctor and the Master appear evolve over the years... Written by Murray Chapman

The Doctor is a eccentric alien scientist from the planet Gallifrey, planet of the Time Lords, a race of supreme beings who have discovered the secrets of time travel and they never interfere with the affairs of other planets and they only observe and gather knowledge. The Doctor decides to leave Gallifrey because he is bored and he decides to go and explore the universe on-board a space/time machine "The TARDIS" which is in the shape of a police box from the 1950's. Like all Time Lords, The Doctor can "Regenerate" (Change his appearance and personality when his body is worn out and he is mortally wounded). During the many years of The Doctor's travels through time and space, he is joined by various companions: His granddaughter Susan, School Teachers Ian and Barbara, crash survivor Vicki, space pilot Steven, Trojan handmaiden Katarina, Space Special Security agent Sara, Cockney girl Dodo, secretary Polly, Cockney sailor Ben, Scottish highlander Jamie, Girl from Victorian times Victoria, Intelligent astropyscist Zoe, Military officer Brigadeer Alistair Gordon Lethbridge Stewart, scientist Liz, U.N.I.T agent Jo, journalist Sarah, Naval medical officer Harry, tribal warrior Leela, Time Lady Romana, mathematical genius Adric, determined Nyssa, Australian flight attendant Tegan, alien exile Turlough, shape-shifting android Kamelion, American student Peri, computer programmer Mel and explosives expert Ace. The Doctor battles the galaxy's most evil beings: The Daleks, mutants into robotic bodies hell bent on exterminating all life in the galaxy, The Cybermen, robotic humanoids from the doomed planet Mondas, Davros, the Dalek's crippled creator and The Master, a time lord gone bad. The Doctor is also scientific advisor to U.N.I.T (United Nations Intelligence Taskforce) commanded by Brigadeer Lethbridge Stewart to combat alien menaces that threatens Earth. Travelling with The Doctor through time and space on-board "The TARDIS" and fighting alien menaces and the galaxy's most evil begins is the adventure of a lifetime you'll never forget... Written by Daniel Williamson

When two school teachers enter a London junkyard one foggy night in 1963 in search of a mysteriously advanced student, they do not suspect that it will be the beginning of an adventure across the infinite reaches of time and space. For there they encounter a crotchety old man who calls himself 'The Doctor', who apparently lives inside an old police telephone box... which is, in fact, an astounding time and space machine larger inside than out, called a TARDIS. Over the course of the series, companions would come and go, the Doctor himself would 'regenerate' into different men at the point of death and develop into a champion of justice and freedom, and numerous evils would arise to challenge him and threaten the universe with domination and destruction, such as the evil pepperpot Daleks and the soulless, emotionless Cybermen. And it would be revealed that the Doctor is a renegade Time Lord, from a world called Gallifrey... or is he? Written by Scott

The Doctor is a mysterious time traveller from a distant planet. He travels through time and space in the TARDIS, (Time And Relative Dimensions In Space) The TARDIS is disguised as a 1960's London Police Box which is larger on the inside than on the outside. His adventures take him through time and space to other planets and galaxies and any period of time within the history of these Planets and galaxies. He has a fondness for Earth and it's inhabitants and has visited there many times at various stages in it's history. His main aim is to fight evil and oppression whereever he finds it. He is usually aided and sometimes hindered in this quest by one or two traveling companions he picks up at various points in his adventures. His greates foes have been the Daleks, the Cybermen and an evil opposite from his own race called the Master. The original series aired on BBC TV from 1963 through to 1989 - in 2005 the legend continues! Written by Steve Lynch

Rose Tyler, a young shop assistant in a London department store, lives a humdrum and profoundly average life - until the night the shop dummies where she works wake up and try to kill her. Her life is saved by a strange man who only calls himself The Doctor, and intrigued by him, she finds herself thrown headlong into a hectic battle to stop an alien presence from invading Earth and annihilating the human race. She comes to learn that her new friend is even stranger than she thought - in fact, the Doctor's an alien adventurer called a 'Time Lord', seemingly the last of his race, who travels through time and space in his TARDIS battling evil where he finds it. And if she travels with him, she'll find herself witnessing the heat-death of the Earth five billion years in the future, meeting Charles Dickens in the past, and encountering lifeforms and invaders stranger than she'd ever thought possible. Only one thing is certain - it'll be the ride of a lifetime... Written by Scott Nisbet

19-year old cockney girl Rose Tyler, working as a shopping assistant at a superstore in London, England is about to find her life is about to change. One night when she meets The Doctor, who saves her from plastic aliens creatures known as "The Autons". Curious about the man who saved her, Rose discovers The Doctor is not human, he is a Time Lord from the planet Gallifrey. The Doctor's race The Time Lords have been wiped out by the Daleks in a war and the Doctor is the last Time Lord alive. Rose decides to join The Doctor on-board his space/time machine "The Tardis" and the Doctor and Rose travel through the time/space continuum where they travel to distant planets, through Earth's history (Past and Future) and travel back in time to historic events. Where the Doctor and Rose do battle with the galaxy's most evil beings and menacing aliens and encountering all sorts of people of lifeforms on their adventures. It is the ride of a lifetime Rose will never forget... Written by Daniel Williamson

The Doctor, an alien time traveller from the planet Gallifrey, is transporting the remains of his nemesis, the Master back to their homeworld. However the Master is not as dead as the Doctor thinks. The Master's essence escapes and sabotages the TARDIS, the Doctor's time machine causing it to crashland in San Franscisco on December 30th 1999. The Doctor requires a beryllium atomic clock to repair the TARDIS, but is shot as he leaves the Ship. Taken to hospital, the Doctor's seventh regeneration is triggered by a medic, confused by his alien metabolism, while the Master takes over a paramedics body. He needs a Time Lord's body to survive - the Doctors'. Newly regenerated the Doctor must fight to save his own eighth body, and the world when the Master sabotages the TARDIS power-source. By midnight on December 31st 1999, the Earth will be pulled through this power-source, a mini-black hole, and only the Doctor can stop if only he can remember who he is... Written by Dave Gardner

While transporting the remains of the Master, an evil Time Lord, the Doctor suffers a TARDIS malfunction and ends up in San Francisco in 1999. The Master escapes and assumes a bodily form, the Doctor regenerates, and with the help of an attractive heart surgeon the Doctor must locate and defeat the Master before the turn of the millennium at midnight. Written by Michael C. Berch