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
Great Intelligence in several New Adventure novels ("All-Consuming Fire", "Millennial Rites", "Business Unusual", "The Quantum Archangel" and "Divided Loyalties") in which it is identified with H. P. Lovecraft's Yog-Sothoth, a being from the universe before this one. The Great Intelligence also appeared in a back-up comic strip in "Doctor Who Weekly" Nos. 31–34. The Great Intelligence had no physical form and thus relied on possession of living creatures to manipulate its environment. It existed on the astral plane and could enter the people it encountered. It allowed Padmasambhava to live over 300 years while he created the Robot Yeti and it also