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
Paradise Towers he realises that the Chief Caretaker has been allowing the Cleaners to kill people in the Towers, but this has got out of hand and the Chief Caretaker is no longer in control. The creature the Chief keeps in the basement is demanding more sustenance and making its own hunting arrangements. When the Chief heads off to investigate the deaths of Tabby and Tilda, the Red Kangs attack the HQ and rescue the Doctor. He returns with them to their base, taking with him the Illustrated Prospectus for the Tower, which they all watch. It reminds the Doctor that Kroagnon,