I only have vague memories about this but it's an American or maybe British sci-fi film or TV-show set in our past, present time or in a near future judging by the environments, that includes aliens that forces a worm to enter restrained humans' heels or mouth from glass vials. A terrified victim strapped to a chair in a surgical room of sorts at one point had his mouth forced open with a steel ring so that the worm could enter. If I recall correctly there were also floating metal orbs in the sky and a horse-carriage driver wearing a very oddly shaped mask. Hope I'm not mixing up things here but this is all I remember and I haven't found anything about it. It's not body snatchers. Any ideas? Thanks in advance!
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Seems like a mash-up of Stargate SG-1 and Doctor Who– Anthony XApr 22 at 18:03
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2In roughly which year did you watch this and when do you think it might've been made?– LogicDictatesApr 22 at 18:16
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1The worms in the mouth made me thing of the TV show Dark Skies from the late 1990s. Dont know about the horse carriage driver though... you can watch it here, see if it rings any bells... youtube.com/…– skyjackApr 22 at 22:31
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1It's a pilot for a failed TV series called White Dwarf! Stay tuned for a full answer– Vanguard3000Apr 24 at 13:58
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1@Bastron It's pretty obscure now. I remember being fascinated by it as a kid when it aired, and for years I thought I might have imagined it (the visuals of the floating orbs you mentioned really stuck with me) until I finally remembered the name a few years ago and was able to watch it again.– Vanguard3000Apr 24 at 14:25
1 Answer
This is White Dwarf (1995).

Originally a TV pilot that flopped after (I recall) significant hype, it stands alone as a TV movie.
From Wikipedia:
In the year 3040, New York medical student Driscoll Rampart (Neal McDonough) is completing his internship on Rusta, a rural planet which due to it being tidally locked to its primary, is divided into contrasting halves of day and night with the halves separated by a wall. The two sides are involved in a civil war: The day side containing a Victorian-styled colony is at odds with the night containing a medieval kingdom. The differences between the two cultures leaves Rampart in a state of wonder. Rampart arrives from Earth for a six-month stint at the Light Side clinic run by Dr. Akada (Paul Winfield). Rampart's ambition is to eventually set up a private practice in Manhattan on Park Avenue.
...set in our past, present time or in a near future judging by the environments...
The film had a bizarre mix of sci-fi, medieval fantasy, and pastoral frontier aesthetics, which is possibly why it failed to impress, and is probably why you're having a difficult time remembering the era in which it was set.
...aliens that forces a worm to enter restrained humans' heels or mouth from glass vials....
(Trigger warning for the very squeamish.)
There is a worm-like parasite that is used at one point to assassinate a sleeping man. The parasite is in a glass bottle held against the man's heel.
If I recall correctly there were also floating metal orbs in the sky...

The planet, having a distinct day side and night side, is kept habitable by "Regulators" - floating steel orbs of ancient alien origin. They don't rally factor into the film's story much aside from explaining how a tidally locked planet could be habitable, but they feature in a lot of establishing shots.
...and a horse-carriage driver wearing a very oddly shaped mask.

The carriage that brings Rampart from his (unseen) landing site to the day side colony is an old horse & buggy, but the coachman is wearing a strange gas mask.
Here is an article with a bit more detail about the show's plot, setting, and production. The film is pretty obscure now, but I was able to watch it online a year or so ago (even if I remembered the link I doubt I'd be able to add it here) and while it's a bit clunky at times, it's a lot of fun.
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1Unfortunately not. Google isn't giving me much, and I can't recall where I was able to stream it a few years back. I couldn't even find many good screenshots for this answer. But I'll keep an eye out for it for you, because I recommend watching it. It's weird, but totally unique. Apr 24 at 14:34
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2@Bastron Try with this proxy site. First, choose Youtube in the quick links below. Then paste the link of one of the Youtube videos into the search bar, and there you go. Apr 24 at 16:26
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2Nice! Thanks, @Clockwork! I've used this to get some screenshots to illustrate the answer. @Bastron I hope you enjoy the show. It's one of those shows that had a lot of potential, but bit off a bit more than it (or audiences) could chew. Apr 24 at 20:10