While audiences are gearing up for The Day Of The Doctor, Doctor Who fans can also expect another great special coming from the BBC called An Adventure In Space And Time – telling the story of how Doctor Who came to be in real life, 50 years ago on November 23 – an valuable depiction of the beginning of what would become a cultural phenomenon and the longest-running sci-fi series in history.

Mark Gatiss, of Doctor Who and Sherlock fame, writes and produces the special, which features David Bradley (Harry Potter, Game of Thrones) as William Hartnell – the first Doctor – in a piece of casting that sees Bradley look just like Hartnell. The similarities are eerie.

An Adventure In Space And Time tells of how the television show came into being, the importance of first showrunner Verity Lambert (played by Jessica Raine), and the world-shattering approach in the impossible task of trying to tell stories on poor budgeting and how much of a phenomenon the series quickly became.