Here’s an interesting roundup of films that have either never made it onto the screen, or were botched so badly that they shouldn’t have made it. It’s hard to argue with most of these.
Visions of awesomeness flashed through my head, a Blade Runner-ish Earth with sprawling, filthy buildings, huge, flashing billboards with giant Asian women on them, eat-up flying cars whooshing by and steam always rising from the streets for some reason. Then, the aliens start breeding in the sewers until the creatures come boiling up out of manholes by the hundreds, to be cut to pieces by Marines with pulse rifles and maybe in the climax, the Army has to nuke the city…
(One of the comments suggests bringing Zelazny’s Lord of Light to the big screen. As if.)