While enormous franchises have dominated the sci-fi film genre for decades, not every great sci-fi movie is meant to be a part of one. Some films are so well done, and tell such a complete story, that a follow-up would be unnecessary — and often, if one is attempted, it's a total failure. Other sci-fi movies open the door for expansion, but never have the opportunity to explore it. While some have been box office flops, others have been poorly received by critics, and at least one even lost the interest of its original director. Here are 10 awesome sci-fi movies that never got a sequel.
