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
Before the Flood (Doctor Who) "Before the Flood" is set in both 2119 and 139 years before, in 1980. In the cold opening, the Doctor explains to the audience the nature of the bootstrap paradox, posing that if a time traveller recreated Beethoven's music after learning Beethoven never existed, what is the origin of the music, or "Who really composed Beethoven's Fifth?" The Doctor, O'Donnell, and Bennett arrive in 1980, before the town was flooded and the day the alien craft landed. Bennett asks why they are in Russia, and the Doctor explains they are still in Scotland, but in a mock Soviet town. They