Wasn'y the first telemovie that much of a reboot though? Basically it remade the series final and allow them to wrap it up by filming what would of been the first episode of the second season.
I've read the scripts for both "Soul Trail" (which would have been the second season premiere) and the original Dark Horizon script written in 1990 (which would have been the first of two movies to wrap everything up airing in 1991).
"Soul Train" is basically Dark Horizon without Aphossno, but there are several b-stories that never made it to Dark Horizon. One is that a kind of telepathic depression begins to overwhelm all Newcomers as they face their exctinction.
Another is George coming to terms with what religion means to him in a time of crisis. A remnant of this story survives in one scene of Dark Horizon, when Matt tells George he should get a priest for Emily, and he tells Matt he doesn't believe priests determine where her soul will go. In the original script, Matt continues to press George, leading to a scene where George admits to Matt that his religion is only for cultural identity.
An unnecessary story is Matt meeting up with an old friend to help him with the case who turns out to be -- wait for it -- working with the purists! Making this yet another friend of Matt's who turns out to be either a criminal or a d*ck (Jim Trenner, Theo Miles, that guy who hit on Cathy in "Real Men," etc.)
The Buck story was originally resolved in one short scene where Buck tells principle Fischer what he thinks of him and storms off. That's it.
Instead of Aphossno bring down the chopper, Matt shoots the fuel tank and it explodes. The episode ends with the DH scene where Matt tells a sleeping Cathy how he feels.
After the series was was cancelled, Fox ordered two movie scripts in order to wrap up the series' loose ends, and the original Dark Horizon and Body and Soul scripts were written.
The original DH didn't differ too much from what we eventually saw. The main difference was that there were no offworld scenes at all in the first script. Although Ken Johnson indicated in interviews that the overseers were drawn to Earth by the signal sent in the episode "Contact," the script I read had the homeless overseer carrying a beacon, just as in the aired film.
Several b-stories from the first B&S script were saved for future movies. A variation of the Emily storyline from "Millennium" was in this script, as was the story of Albert and May wanting a baby that later showed up in "The Enemy Within.". Those stories were excised from the final film to make room for more conspiracy stuff Fox requested (because since conspiracies worked on X-Files, they should automatically be included in AN). Most of the final act of the aired film is totally different from the script. The original ending, too, was a bit of a downer. The giant and child go off into the desert. Matt says, "They don't have a chance." George adds grimly, "They never did." George's line in the final film is changed to something like, "The spirits of those who were lost -- they give them a chance."
There were other scripts, as well, written for a second season that never came. One was "On Seperate Ways," where George and Matt track down baby-knappers in France. The only things I remember from that was that Vessna was going to be used as bait, and there was a scene where George looks out of a plane at open ocean and says to Matt, "Do you know what this plane will go down in if it crashes?" Matt, his usual self, replies, "A buncha flames?"
Another script was "The Change," which was novelized. I never read the script for that one, though. Just the novel.
Oh, yeah, and there was one more movie script written called "City of Angels," but after the poor ratings of the last movie, "The Udara Legacy," it never saw the light of day.