Science fiction fandom other groups including LGBT communities, libertarians, neo-pagans, and space activist groups like the L5 Society, among many others. Some groups exist almost entirely within fandom but are distinct and cohesive subcultures in their own rights, such as filkers, costumers, and convention runners (sometimes called "SMOFs"). Fandom encompasses subsets of fans that are principally interested in a single writer or subgenre, such as Tolkien fandom, and ("Trekkies"). Even short-lived television series may have dedicated followings, such as the fans of Joss Whedon's "Firefly" television series and movie "Serenity", known as Browncoats. Participation in science fiction fandom often overlaps with other similar
History of science fiction films Frederik Pohl wrote in 1962 that the last good science fiction film most readers would be able to name was "Forbidden Planet". He explained that the studio system produced "very big" or "very little" films. Large films were often remakes of other large films, few of which were science fiction, and B movies used non-genre writers instead of being based on existing quality science fiction. In 1968, he said after "2001" that "the science fiction movie we've all been waiting for still hasn't come along", and that "Things to Come" was the most recent serious large-budget film with good actors