. . . . . . . . "2011-04-23" . . "impending death" . "the Doctor's death" . "2700.0" . "sixth series premiere" . . . . . . "The Impossible Astronaut" . . . "future execution of the Doctor" . . . . . "\\\"The Impossible Astronaut\\\" prequel" . "The Impossible Astronaut" . . . . . . . . "the Series 6 premiere" .