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) "Her days, yes, her "nights"...well...that's between her and me". After this episode, the banter and gentle sexual innuendo between them becomes less teasing and more serious. Later, in "The Name of the Doctor" (2013), the Doctor kisses a holographic projection of River Song, based on the copy of her mind archived in the great Library of the 51st century. During this episode, both the Doctor and River call her his wife. He reveals that the reason he has avoided mentioning her since her death was for fear that the memory would hurt too much – as River notes to colleagues,