‘Doctor Who’ thing of the day: “Lost In The Dark Dimension” fan trailer

“Castrovalva” tells us:

'(Lost In) The Dark Dimension' was a name given to a potential 30th Anniversary Doctor Who special feature length film, which would have been written by Adrian Rickelsford, and in which the 3rd - 7th Doctors would have starred. Unfortunately, the film was never produced, but here is an example of how the trailer for it might have looked.

The Doctor Who TARDIS Index File elaborates:

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'.

I’m sure it would have been really cool. Even if those multi-Doctor stories always squicked me out a little. I mean: He’s supposed to be the same man all the way through, right? So how are these stories any different from one in which, say, multiple Sylvester McCoys were all running around?

(If you stumble across a cool Doctor Who thing, feel free to email me with a link.)