Doctor Who is a long-running British science fiction television series that follows the adventures of a Time Lord known as the Doctor as he travels through time and space in a sentient spaceship called the TARDIS, with various companions.
The font used in the title card of the TV show resembles a font named Doctor Who, which was created by James Easton. This font comes in uppercase letters, numerals, and a few punctuation marks, and it can be downloaded for free from the Font Used Section.