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
Paradise Towers headed to the top of the building, and are captured by a party of Blue Kangs. Before the pair are freed the Kangs reveal to Mel that Pex survived by fleeing from the war. The Doctor finds the Great Architect is named Kroagnon, and is reunited with the Red Kangs. They explain that Kangs and Caretakers have been disappearing in ever greater numbers. While the Doctor is being interrogated, the Caretakers track him down to the Red Kang headquarters and attempt to break down the door. Elsewhere Mel has visited Tilda and Tabby again and soon finds herself under threat