IMHO, Pitch Black was one of the better sci-fi movies of the past 10 years.
As for the campaign, I did something like this a few years ago for a D&D campaign designed to introduce some people to 3Ed. The world wasn't plunged into darkness- that was what my homebrewed critters- The Dark (a kind of demon)- were aiming to do. I used some Lovecraftian & Pitch Black elements, as well as a dose of Mark Z. Danielewski's
House of Leaves. (
http://en.wikipedia.org/wiki/House_of_Leaves )
By and large the campaign was a success. It lasted about 2 years and only broke up because RW problems intruded.
Caveat- I was a bit burned out on D&D when I was asked to run this campaign by friends. Because of this, I made one crucial error in my creature design.
The Dark had the ability to make creatures succumb to a minor and very focused form of mind control- they could force you to extinguish light sources or make you reconsider using attacks that shed light (including spells like lightning bolt or fireball, flaming weapons, etc.). I resolved this by using a Will save mechanic. They attacked by doing a little HP damage with a chance of ability damage on a crit.
My error was that I usually had them damage Str, but high level PCs would routinely make their Will saves and use terribly damaging light-shedding attacks. I should have had The Dark drain
Wis instead. The result was that the climactic battle was a bit less epic than it should have been.