Not true. After the initial trilogy there was The Quatermass Conclusion with John Mills. The version released in the US (which I saw) wasn’t complete, it turns out. It was very disappointing.
There were other Quatermass appearances on radio and elsewherre, and remakes of the original series. See here, for instance: Bernard Quatermass - Wikipedia
From what I read, I’m not terribly interested.
The original TV serials, by the way, are significantly different from the films that were made of them. Only part of The Quatermass xperiment survive (and are available on DVD), but the script survives, and was published by Penguin books many years ago. It’s worth reading. The other two 1950s series scripts were published by Penguin as well, although the serials survive (I have Quatermass and the Pit – it has a more “realistic” space ship than the film, although I prefer the filmed version overall).
Nigel Kneale, the writer of all the Quatermass entries, also wrote the scripts for the Abominable Snowman of the Himalayas and First Men in the Moon. He apparently hated science fiction fans.
Xchange (2001) and Strange Days (1995) are both worth a look, I think. Strange days especially gets a lot of the mood of nasty cyberpunk/noir just right.
ETA: I second “the quiet earth”
+1
2001 overshadowed Silent Running. I think the special effects of SR were just as good (for the time). I especially loved the scene of the robots cheating him at poker.
Someone has surely said both of these delightfully flawed films but I didn’t catch it if they did…So, my error.
Battle Beyond the Stars with George Peppard, Richard Thomas, Robert Vaughn, John Saxon and Sam Jaffe. A wonderfully cheesy Roger Corman creation. It is a science fiction remake of the Magnificent Seven and one of the coolest thing about that is, in this joyously painful movie, Robert Vaughn does the same role he did in the Western.
Zardoz with Sean Connery as an out of time Conan the Barbarian type. This film too is an homage to an earlier film and part of the fun is figuring out which film. Granted it beats you over the head with the homage, but still it is fun because of that.
I was right Boyo Jim did mention Battle Beyond the Stars, but it is so delightfully campy, it deserved two mentions.
I know that this film is far from “lesser known” on this board. In fact, I believe it is mandatory for membership to SDMB to be an expert on the film, but the general public may not be overly conversant with it.
The Adventures of Buckaroo Banzai Across the 8th Dimension with (among others) Jeff Goldblum. Still, after all these years, one of my favorite SF films.
Planet Of The Vampires-
Low budget but cool looking 60s B-movie, psst there are no actual vampires more like zombies.
Galaxina-
WOW if you thought Battle Beyond The Stars was cheesy and corny get a load of this one, it even veers into parody at times(Alien) but is oddly loveable. You’ll either love or hate this goofy inept movie. Great for late night THC tinged viewing.
Sky Captain and the World of Tomorrow is a loving homage to the 1930s era Sf adventures. Much has been made of Gwyneth Paltrow fucking up the film, but she is merely competent, she does not really harm the film because her role as written, could not have “made” the film … she was merely a Type II Spunky 1930s heroine. It is a beautiful film to look at and moves right along plotwise.
I’ll second “Mom and Dad Save The World” – on the surface it’s a family film with an emphasis on kids, but it’s a lot smarter than it pretends to be, and is fun for all ages.
Galaxina absolutely SUCKS. This from someone who is going to recommend some SyFy Channel original movies to you tomorrow. All it has is Dorothy Strattens’ good looks. Otherwise, a dead loss. you’d do better to spend your time getting dental work without an anesthetic.
Really? I thought the narrative change completely ruined it.
Plus one for Primer
First of all, there is the SyFy six-episode miniseries “The Lost Room” which is about as good as science fiction gets. Period. No disclaimers, no nothing, it is so good that it’ll make the hair on the back of your neck stand on end when you realize that it’s a SyFy Channel original … what magic is this? At just six episodes, you can think of it as a long movie. Really, it’s EXCELLENT.
These are a couple of SyFy Channel movies, which is to say, they reside squarely at the bottom of the science fiction barrel. These are not great movies, but they ARE exceptional among SyFy Channel movies in that IMHO they are solid little B movies that move right along rather trudging dully along as most SyFy movies do.
I found a list of the ten best SyFy original movies. Don’t know that I agree with them, but there’s some good ones in there, especially their top pick.
In addition, I recommend Alien Apocalypse, and not just because it’s got Gabby, Xena’s BFF, gagged and suspended at one point. It also has Bruce Campbell in the hero role, with elements of Postman and Planet of the Apes moving the story along.
I’m also particularly fond of “Anacondas: The Hunt for the Blood Orchid” which is actually a pretty good jungle adventure movie (set in Borneo) that happens to feature giant snakes eating people. A nice little B movie once again.
There are more good SyFy Channel movies I can’t think of offhand, but a lot of them are "only watch if there’s no actual good stuff around.
The Bed Sitting Room, an odd little no budget post-apocalyptic movie with Peter Cook, Dudley Moore, Michael Hordern, Ralph Richardson and spike Mulligan, directed by Richard Lester. I’m pretty sure drugs were involved.
I jusr watched Iron Sky on Netflix and boy is it a doozy 
If Nazis from the moon sounds like something you’d dig, check it out.
Totally agree! I was hoping they’d make it into a series–seems like they were setting things up for that, but I guess it didn’t pan out. I like to say The Lost Room is the best Stephen King story that wasn’t written by Stephen King.
I watched that on DVD about a year ago. Pretty well done and definitely worth watching.
Equilibrium- a surprisingly good Sean Bean flick.
Cube- Not sure if this is horror or SciFi, but it’s pretty great.
ETA: I can’t believe nobody’s mentioned Pi - a classic, with one of the best soundtracks ever!
OK, how about Galaxy Quest?
Although it’s mostly a comedy, and a parody of Star Trek and Trekkies, this very funny movie is actually a great SciFi movie in it’s own right.
Lesser known?
Well, *The Day the Earth Stood Still *was mentioned on the first page, and that has to be one of the the all-time classic SciFi movies! I mean, it was even re-made a few years ago (of course, the re-make stunk).
So, I figure that Galaxy Quest rates…
There’s “Outerworld” which is on netflix, which is very good IMO. Made on only $175,000 in the 80’s, I really like cyberpunk and depictions of corporate warfare.
Starcrash-
This is one of the more fun “so bad its good” movie experiences I’ve had, I love how Stella appears to hopped up on crack most of the time. Also love the fact her hair is still styled and all when working in a brutal death camp(all the other prisoners look the part).
A favorite, and I have the DVD set. It’s incredibly well-liked and since the chief special effect is putting a 200-watt bulb behind a door it can’t have been expensive to do. I’d rather have had this series than Eureka or Warehouse 13.