Paradise Towers the Great Architect of Paradise Towers, also designed Miracle City, a cutting-edge development which killed its occupants. It seems Kroagnon had an aversion to people actually populating his buildings. The Blue Kangs arrive suddenly, overpowering the Red ones, but it soon becomes clear their game is over and they must now work together. Mel and Pex finally find the swimming pool. When Mel takes a dip in the pool, she is attacked by a robotic killer crab. The Red Kangs know of the monstrosity in the basement, and guess it must be linked to the terror in the Towers. The
The Name of the Doctor of the Doctor's prior incarnations is used during scenes in which Clara and the Great Intelligence interact with the Doctor. Footage of the First (from "The Aztecs", 1964, with dialogue from "The Web Planet", 1965), Second, Third (both from "The Five Doctors", 1983), Fourth ("The Invasion of Time", 1978), Fifth ("Arc of Infinity", 1983), and Seventh ("Dragonfire", 1987) Doctors was shown. Stunt doubles were used for some other brief appearances, including the Sixth Doctor walking past Clara while she is in a corridor. The Ninth Doctor can also be seen running past her in the Doctor's time stream. The opening