Now doesn't that make you want to go out and take a look? No? Me neither! ---- A great story which probably shouldn't have been changed in the least.
Because I'm a glutton for punishment . . .
Nightfall (2000)
Direct-to-video version of the Asimov story. The conflicting forces are the Watchers (religion) and the University (science.) Starts with a Watcher archaeological expedition of some sort opening a pit containing the remains of the folks who went mad and killed each other the last time there was darkness, a millennium ago. The daughter of David Carradine, the head of the University (and the only big name in this thing), although forbidden to enter, sneaks in. (The Watchers only leave one guard, and he falls asleep, even though this is supposed to be a very big deal and vital to keep the University folks out.) Even though this pit was covered up until just now, it's full of a huge number of cobras. (This was filmed in India, and you can tell. The Watcher temple is quite obviously a Hindu temple.) A Watcher rescues her with his amazing telekinetic powers, setting the snakes on fire. You see, he was born with these superpowers, left to die by his parents, and adopted by the evil head of the Watchers for his own sinister purposes. Since this superhero is our Good Guy, however, he doesn't really believe in the Watcher stuff. He goes with the heroine out into the desert. After a random battle with "sand searchers" (folks with faces painted black and white, wielding huge swords, and riding horses), they go into a cave, have a random battle with "darklings" (underground folks with, again, big swords) and meet a woman who is living in yet another set of ruins from the last time of darkness. They make their way back with a telescope. (Even though the heroine has a Flash Gordon style zap gun to fight with, apparently this civilization never got as far as telescopes. Oh, by the way, the clue that led them to the cave was the fact that the hero found a camera there sometime in the past; another form of technology they don't have, it seems.) The two become lovers, of course. It all boils down to darkness coming, and the Watchers launching an attack on the University with, you guessed it, big swords, intent on killing them all. Instead of the appearance of the stars driving people mad, as in the story, apparently civilization falls every time it gets dark because of this kind of violence.
This version is a tiny bit better than the 1988 version, I think, although it's not very good at all. It's got a few little bits that actually have something to do with the original story. (The fact that the folks have an inherent fear of darkness, so that a "thrill ride" is just walking through a dark tunnel. When the heroine finds a notebook in the cave, the text, apparently the observations of a witness to the last time of darkness, is taken from the last few lines of the story.)
But there are a lot of bad points. The hero's god-like superpowers are ridiculous, and the heroine seems more like a whiny teenager than the bold scientist she's supposed to be. The film doesn't really need the seemingly endless scenes of sword fights, explosions, fires, and the like.