5. The Dark Dimension
To celebrate Doctor Who's thirtieth anniversary in 1993, the BBC's original idea was to make a feature-length TV special, featuring multiple Doctors. Entitled The Dark Dimension, it was to star Tom Baker with cameos from all other surviving Doctors Jon Pertwee, Peter Davison, Colin Baker and Sylvester McCoy. It would have seen the villainous Hawkspur (the first choice for the role was comic Rik Mayall) avert the regeneration of the Fourth Doctor at the end of Tom Baker's final episode Logopolis, thereby creating 'a dark dimension'. Realising this would wipe out his future incarnations from history, the Fourth Doctor would battle to get his timeline back on track. The special would also have featured redesigns versions of classic monsters; the Daleks would have been equipped with bigger weapons while the Cybermen would have sported a shiny, skeletal new look (see above). The aim seemingly being to make them resemble Frank the Rabbit from Donnie Darko! The whole idea sounds completely barmy and convoluted but you can't fault its ambition. In the end, it never got the funding it needed and the show's 30th was signified by a 20 minute Children in Need special, Dimensions in Time, which saw Doctors Four to Seven alongside various companions trapped in a time loop in soap opera Eastenders' very own Albert Square. If you thought it was impossible to make a barmier and more convoluted idea for a Doctor Who special than the Dark Dimension, think again.