Despite having only been announced as the new Doctor a few months ago, Scottish actor Peter Capaldi already has something of a Regenerate-by date on his time as a time traveler.
Show runner Stephen Moffat has raised concerns that we'll be seeing a 13th Doctor before this time next year by mentioning the length of Capaldi's contract in an interview. He has since confirmed that The Thick of It star is signed on to play The Doctor for just 13 episodes, to be split into two 6 episodes series and one special over 2014. After which he will either go all orange and fizzy and turn into someone else or, if he's popular enough, stick around for a wee while longer.
