Dr Who - Ultimate Time Traveller

David Tennant (born David John McDonald on 18 April 1971 in West Lothian, Scotland) is a Scottish actor. In addition to his work in the theatre, Tennant is best known for his role in Doctor Who as the tenth incarnation of the Doctor.

Prior to this however, his name was known in Casanova as the title character, and as Barty Crouch, Jr. in Harry Potter and the Goblet of Fire.

Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a mysterious alien time-traveller (called a Time Lord) known as "the Doctor" who travels in his time and spaceship, the TARDIS, which normally appears from the exterior to be a blue 1950s police box. With his companions, he explores time and space whilst facing a variety of foes and righting wrongs.

The programme is listed in Guinness World Records as the longest-running science fiction television show in the world, and as the "most successful" science fiction series of all time, in terms of its overall broadcast ratings, DVD sales, book sales and iTunes traffic, as well as "illegal downloads." 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). The show is a significant part of British popular culture; in the United Kingdom and elsewhere, it 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. After an unsuccessful attempt to revive regular production with a backdoor pilot in the form of a 1996 television film, the programme was successfully relaunched in 2005, produced in-house by BBC Wales in Cardiff. The first was produced by the BBC and seasons two and three of the new series had some development money contributed by the Canadian Broadcasting Corporation (CBC), which was 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 standalone K-9 and a single 1981 pilot episode of K-9 and Company.

The show's protagonist, the Doctor, has been played by ten actors over the history of the show so far. The transition from one actor to another is written into the plot of the show as regeneration, and the different portrayals are often treated as distinct characters, to the extent that they have on occasion encountered one another and worked together. The Doctor is currently portrayed by David Tennant, who will leave the role after appearing in four special episodes throughout 2009 and early 2010. In the programme's most recent series, which ended on 5 July 2008, Catherine Tate played the Doctor's companion, reprising her role of Donna Noble from the 2006 Christmas special. Following the 2009?2010 special episodes, a fifth series will air in 2010, in which the Eleventh Doctor will be portrayed by Matt Smith with Karen Gillan playing his companion, Amy Pond. On 6 October 2009, a redesigned logo was unveiled. The new logo accompanies a redesign of the iconic TARDIS, to be shown in 2010.Gallery of Doctor Who

Billie Piper (born Lianne Paul Piper on 22 September 1982) is a British singer and actress.

She began her career as a pop singer when she was a teenager and progressed to acting; her roles include Rose Tyler, companion to the Doctor in the television series Doctor Who from 2005 to 2006, a role she reprised in 2008. In 2007, Broadcast magazine listed Piper at no. 6 in its "Hot 100" list of influential on-screen performers, the top woman on the list. She has also portrayed the prostitute Belle de Jour in Secret Diary of a Call Girl.