20 Cancelled Doctor Who Episodes You Need To Know About

One of RTD’s hopes for the 2008 Christmas special was to secure another big-name guest star, someone on the level of a Catherine Tate or Kylie Minogue.

Having just finished reading the final Harry Potter book and enjoying it immensely, an idea suddenly occurred to him: what if the 2008 Christmas companion was JK Rowling?

Davies had actually asked Rowling to write for the show back in 2004, but having her actually appear in the show was a different prospect entirely.

He was also keen to continue the trend of having the Doctor meet famous authors, having previously featured Dickens, Shakespeare and Agatha Christie.

Had this story gone ahead, it would've involved a space bug leaping onto Rowling’s back and bringing the world of her imagination to life, enabling wizards, witches and magic to feature in the Doctor Who universe.

However it was quickly kiboshed by David Tennant, who felt it sounded too much like a spoof, and Rowling herself wasn't too keen.