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
Tales of Tomorrow "Versatile Varieties", which had its last broadcast on December 14, 1951. While the television version of "Tales of Tomorrow" was still being produced in 1953, ABC decided to try a radio version. The radio show ran from January 1 to April 9, 1953. Unlike the TV version, scripts were adapted from stories appearing in "Galaxy Science Fiction"; the contemporary series "Dimension X" previously had a similar relationship with "Astounding Science Fiction" magazine. The radio series was not successful. After only a few episodes, on February 26 it moved to CBS for the remainder of its 15-episode run. The TV version