The basic story that unfolds in Horizon is interesting enough, and could have been the basis for an above-average sci-fi flick. Unfortunately the screenwriters did not exhibit similar rigor and creativity when fleshing it out. Plot holes abound, especially towards the end. Lines voiced by actors range from cliched but reasonable, to cliched and awkward, to, in some cases, idiotic. ("Give them hell!" "I intend to" is an instance of both--extremely commonplace-boring, and at the same time, it makes absolutely no sense in context.)
The acting ranged from reasonably good to awkward to cringe-inducing. There were too many fistfighting and gunfighting scenes, going on for far too long. And one or two scenes near the middle added nothing to the story.
I don't regret watching it, but would only recommend it to someone with a taste for B-grade or lower sci-fi.
Review by KFL from the Internet Movie Database.