The Dark Dimension (unproduced TV story)
The Dark Dimension was a planned direct to video film commissioned by BBC Enterprises, it was to have been released in 1993 to commemorate the 30th Anniversary of Doctor Who.
It was to be a direct to video release, written by Adrian Rigelsford (a 'fan scholar').
The Dark Dimension ran into obstacles which prevented it from being produced. Large among which was that BBC Enterprises (which was in charge of generating revenue, not producing films) it therefore lacked facilities, staff and experience in producing something such as The Dark Dimension. Actor availability was another of the problems which faced the production which began at some (indeterminate time) in 1992 (with an aimed release data of November 1993) scheduling all the surviving actors who played the Doctor (Jon Pertwee, Tom Baker, Peter Davison, Colin Baker and Sylvester McCoy) up to that point would have been incredibly challenging and almost impossible considering the set date of release. Finally when Philip Segal (then part of Amblin Television) joined with Universal Television to co-produce a new TV series of Doctor Who (for the American Market), BBC Enterprises had to pull out of the project due to a conflict of interest. [1]
Central Characters and Ideas
The Dark Dimension would have featured all surviving actors who played the Doctor. Plus Ace and a slew of monsters (in particular Cybermen, Daleks, Ice Warriors, Yeti). Alistair Gordon Lethbridge-Stewart would also have appeared along with a character named Summerfield (who could be then Virgin Publishing's Bernice Summerfield).
The central idea to the story was that a creature prevented the Fourth Doctor from dying when he fell off the Pharos Project (at the end of Logopolis), however his future incarnations do survive (some how), but in doing so the creature creates a 'Dark Dimension'. [1]