 The Ninth Doctor 's origins were originally not explored in 2005 , but were given in the show 's fiftieth anniversary special , " The Day of the Doctor " , in 2013 . In the aftermath of the Time War , the War Doctor ( John Hurt ) succumbs to old age . The regeneration scene is cut short before Eccleston 's likeness can be fully seen , as the actor declined to return for the episode and showrunner Steven Moffat wished to honour Eccleston 's decision . Eccleston does , however , appear in stock footage and stills alongside the first eight Doctors . 
