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 Towers before he was killed and trapped in the machine in the basement. The remaining rezzies, led by a woman named Maddy, join them all at the swimming pool and pledge to work together with the Kangs to defeat the menace in the building. Pex pledges to help too. The Deputy Chief Caretaker and the surviving Caretakers, who have become convinced of the peril in the basement, soon join them. The Chief Caretaker has now been killed and his corpse animated by the artificial intelligence of Kroagnon. He now intends to use the Cleaners to kill everyone in the Towers