Paradise Towers two elderly residents ("rezzies") live. Tilda and Tabby explain that all the able-bodied men left the Towers to fight a war, leaving behind only children and the elderly. The only other man still loose in the Towers is Pex, a would-be hero, who appoints himself Mel's guardian. At the Caretaker control centre, the Doctor meets the Chief Caretaker, who greets him as the Great Architect, designer of Paradise Towers, and then promptly calls for him to be killed The Doctor cites an imaginary rule from the Caretakers' manual, confusing them enough to make his escape. Mel and Pex meanwhile have
The Doctor (Doctor Who) Doctor, characters reply "Doctor who?" The story arc running throughout the tenure of the Eleventh Doctor involved the oldest question in the universe, revealed in "The Wedding of River Song" to be "Doctor who?", giving the phrase in-universe significance. In "The Name of the Doctor", the Doctor's real name was revealed to be the password used to enter the Doctor's tomb following his death on the planet Trenzalore. The story arc was resolved in "The Time of the Doctor", wherein it was revealed to be projected by the Time Lords across all of time and space through a "crack in