Pictures: Doctor Who official 50th celebration in London

23 November 2013 Last updated at 12:27 GMT

Thousands of Doctor Who fans are at a special three-day event in London to celebrate the show's 50th anniversary.
Fans pose in front of the 11 Doctors
Thousands of Doctor Who fans are at a special three-day event in London to celebrate the show's 50th anniversary, from Friday to Sunday.
Doctor Who shopping bags
The first ever Doctor Who episode, An Unearthly Child, was shown on TV on 23 November 1963.
Cyberman meets a fan
A special 50th anniversary episode, The Day of the Doctor, is being broadcast on Saturday night at 7:50pm on BBC One. It's also being shown around the world in more than 90 countries!
A Silurian with three fans
Fans at the event are coming face-to-face with some Doctor Who characters... There's also a special effects show and a chance to learn how to walk like a monster!
Peter Davison, Sylvester McCoy and Colin Baker
Former Doctors Peter Davison, Sylvester McCoy and Colin Baker take part in a question and answer session.
Steven Moffat, Jenna Coleman and Matt Smith
These guys are there too! Doctor Who boss Steven Moffat poses with Jenna Coleman and Matt Smith, who's leaving at the end of the year.
Doctor Who monster masks
Monster masks from the past 50 years are on display.
Fan dressed as Tardis poses with Daleks
This fan - dressed as the Tardis - poses with two Daleks.
Fan meets Dalek
And this brave boy has an even closer encounter with a Dalek!
Doctor Who fan dressed as a Dalek
But this fan goes one step further by coming dressed as a Dalek!
Billy dressed as one of the Doctors
Can you guess which Doctor this fan has come as?