2013 was one of the biggest years in Doctor Who history. Clara Oswald had just joined the TARDIS, the Great Intelligence returned, and the 50th anniversary was on the horizon. But behind the scenes, one question dominated: when would Matt Smith’s Eleventh Doctor say goodbye? At first, it looked like he’d stay for Series Eight. But behind the scenes, he wasn’t even signed for the 50th, and Steven Moffat had a wild backup plan with famous guest actors playing the Doctor. By June, Smith confirmed h