Science fiction has always been something of a gamble for film studios. While there have been some epic films like 2001: A Space Odyssey, for the most part, the genre is filled with a smattering of good movies, duds, and financial disasters. The biggest problem with sci-fi isn't that the movies aren't amazing; it's that the films tend to garner fan support from a niche community. When that happens, movies that are generally perceived as being bad because of their box office performance aren't bad at all.
These sci-fi films have received generally poor reviews or had a terrible showing at the box office when they first hit theaters. Despite this, they are beloved by fans all across the world.
For this list, only films that have a 69% or lower on Rotten Tomatoes are considered. Vote up the films worth a rewatch!