 Indeed, earlier on in the episode, both the Tenth and the Eleventh Doctors mistakenly believe that the War Doctor killed all of the Time Lords on the last day of the Time War.After being informed that the plan to save Gallifrey was successful, the Eleventh Doctor sets out to find Gallifrey and restore the Time Lords.In "The Time of the Doctor," the Doctor visits the planet Trenzalore where he discovers a question being broadcast through all of time and space through a crack in the universe