While all forms of art require imagination, the genre of science-fiction is one in which it is especially crucial. Films in this category envision entire worlds of a bright (or dark) future or one inhabited by lifeforms of a greater intelligence — much like the filmmakers who created some of the following films that earned a Rotten Tomatoes score of more than 90%. The following are some of the all-time greatest sci-fi movies that won over most critics, according to the review aggregator site.