K is for... Kroagnon

Kroagnon was a famous 22nd Century architect. So celebrated was he that he was known simply as "The Great Architect". Projects he had been involved with included Golden Dream Park, the Bridge of Perpetual Motion, Miracle City and Paradise Towers.

However, he was so obsessed with the perfection of his buildings that he resented them having to be populated. Inhabitants only spoiled them. His obsession turned to a sociopathy and he began to sabotage the projects - turning them into lethal death-traps for their inhabitants.

Nothing could be proven, but with Paradise Towers the residents decided to take matters into their own hands. They attacked him and left him a disembodied brain, confined to the basement which was made out of bounds to all. 

It was written into the caretakers' rule book that he was to be killed if he ever returned.

However, being linked to the building's infrastructure, Kroagnon was able to take over the automated cleaning machines, and use them to seek out suitable biological material for him to create a new body. In this he was aided by the Chief Caretaker. Eventually, he decided to use corpoelectroscopy to transplant his brain directly into the Chief's body.

One mobile again he had the Cleaners begin wiping out the residents and the caretaker staff. The Doctor lured him into a trap where he was killed by a young man named Pex, who sacrificed himself to blow him up with dynamite.

Played by: Richard Briers. Appearances: Paradise Towers (1987).

• Briers was the nephew of comedy legend Terry-Thomas, and was himself best known for comedy roles, such as in The Good Life.
• His wife Ann Davies had appeared in the series as Jenny in The Dalek Invasion of Earth.
• In 2008 he featured in the Torchwood episode A Day in the Death, as the dying millionaire Henry Parker.
• Kroagnon's backstory makes little sense. Why would the residents leave him alive, even as a disembodied brain? The Chief Caretaker seems to know who he is, yet also accuses the Doctor of being him. Why gather all those dead bodies when he can simply transplant his brain into a living one?