The only actor to have acted in all the final TV stories of the first three 21st century Doctor Whos: The Parting of the Ways (2005) (Christopher Eccleston), The End of Time: Part Two (2010) (David Tennant) and The Time of the Doctor (2013) (Matt Smith).

Doctor Who (2005) is deceptively difficult to write. I think people think it's easy. It's not. It's very difficult to get right.