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 Master (Doctor Who) is travelling through time kidnapping the Doctor's companions as revenge, the Master having presented himself as another 'victim' of the Doctor rather than the villain he truly is. His role in the plan culminates in an out-of-sequence encounter with the Eleventh Doctor after Adam abducts Clara Oswald, the Doctor noting that it has been a pleasantly long time since he saw this version of the Master. However, when the Eleventh Doctor manages to summon his previous ten selves to Adam's fortress to rescue their companions when Adam threatens to kill them all, the Master reveals that his true plan is