Viewers around the world saw Peter Capaldi make his first - all be it brief - appearance as The Doctor in the 50th anniversary episode.
Glasgow-born actor and Oscar winner Peter Capaldi has been unveiled as the 12th incarnation of Doctor Who.
The identity of the Doctor to replace Matt Smith will be announced on television tonight with Peter Capaldi still the bookmakers' favourite
Matt Smith's swansong episode as Doctor Who had to be reritten after he injured his leg, according to reports. The injury was written into the script of the Christmas Day show so fans will see the timelord lose a leg after a battle with the weeping angels.
The Sun reported that fans will see the doctor grow old fighting cybermen and daleks after being drawn back to a planet called Trenzalore by the sound of a bell.
Smith, who is replaced by Peter Capaldi in the Christmas Day episode, said he was excited about his final appearance.
The 50th anniversary episode of Doctor Who has broken a Guinness World Record for the world's largest ever simulcast of a TV drama.
Last night's episode set the record after its was broadcast in 94 countries across six continents following a massive global campaign.
In addition to the TV broadcasts, the episode was screened in more than 1,500 cinemas worldwide, including in the UK, US, Canada, Latin America, Germany, Russia and Scandinavia.
More than half a million tickets were sold for the theatrical screenings at which fans were able to watch the episode in 3D.
This clip from episode one of the Doctor Who story 'The Enemy of the World' shows the Doctor, played by Patrick Troughton, going for a dip in the sea.
The 1967 episode is one of nine tracked down in a store room at a Nigerian TV station, where they were gathering dust.
Footage courtesy of BBC Worldwide.
The newly found programmes - which introduce the character of Alistair Lethbridge-Stewart, better known to audiences as The Brigadier - will be available on iTunes from today and will later come out on DVD.
Phillip Morris, the director of Television International Enterprises Archive, unearthed the programmes by looking up the records of overseas shipments of tapes made by the BBC.
The stories, The Enemy Of The World (1967) and The Web Of Fear (1968) and both starring Patrick Troughton as the second Doctor, have now been remastered by BBC Worldwide, the corporation's commercial arm.
Nine long-lost episodes of Doctor Who which have not been seen since the 1960s have been recovered after they were tracked down to a store room in Nigeria, gathering dust.
The discovery will cause much excitement for devotees of the long-running series, for which there are dozens of missing episodes dating back to its early years
The previously lost nine shows were among 11 traced to a television relay station and the find brings back to life an entire six-episode story, while another is almost complete.
An article penned by Peter Capaldi in 1976 and published in a Dr Who fanzine has appeared online. It comes after Capaldi was named as the star to replace Matt Smith as the Time Lord.
The article describes the opening sequence of Doctor Who and praises the 'artistic integrity and sensitivity' of Bernard Lodge, the man behind five opening titles sequences.
Clearly in awe of Lodge's work, and an avid fan, Capaldi writes: "The wonder of the opening is that it manages to capture in only a very few moments of screen time the atmosphere of Dr. Who."
He adds: "When that blue police box zooms in from a morass of complex light forms, there is no question of its right to be there. So already, within seconds of starting, the title designer has drawn us into the world of Dr. Who."
The outgoing Doctor Who, Matt Smith, welcomed the decision to cast Peter Capaldi.
In a pre-recorded message he said: "I just want to wish my successor all the best and just say good luck and good on you for getting it, because I know he is both a huge fan of the show and a really nice guy.
"The casting of it made me really excited genuinely, and as a fan I think it's a really canny choice, so good luck mate, it's going to be a thrill."
Peter Capaldi, who was the bookies' favourite, is the first Oscar winner to take on the role of Doctor Who.
He said: "Being asked to play The Doctor is an amazing privilege. Like the Doctor himself I find myself in a state of utter terror and delight. I can't wait to get started."