David Tennant provides a spoof introduction to Doctor Who's 50th Anniversary Special, The Day of the Doctor.

A special one-off drama that travels back to 1963 to see how Doctor Who was first brought to the screen. Actor William Hartnell felt trapped by a succession of hard-man roles. Wannabe producer Verity Lambertwas frustrated by the TV industry's glass ceiling. Both of them were to find unlikely hope and unexpected challenges in the form of a Saturday tea-time drama. Allied with a team of unusual but brilliant people, they went on to create the longest running science fiction series ever made.