The Nightmare Fair (unproduced TV story)
The Nightmare Fair was an unproduced TV story for the original Season 23, before it was put on hiatus. It would have featured the return of Michael Gough as The Celestial Toymaker.
It was later adapted into a Telos novelization of the name name, and that was adapted into an audio adventure.
Plot set-up
The main villain would have been The Celestial Toymaker, who's actor Michael Gough, had been convinced to return.
The story would have continued strait from Revelation of the Daleks, with the Doctor's destination for Peri being "Blackpool."
The idea had come to John Nathan-Turner to set the story in Blackpool when Colin Baker had opened a ride there called "Space Mountain." The story would also have been set partially there, with the Celestial Toymaker making strange things happen.
Peri would have been attacked by robot miners in a gold mine adventure ride, and the Doctor would have been forced to play a video game, that's outcome would decide the fate of the planet.
By the end, the Toymaker was defeated, and the Doctor and Peri continued their holiday in Blackpool.