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
Joss Whedon the film, he explained that the core of the movie was about "finding yourself from community" and the togetherness derived from a group that ultimately doesn't belong together. It became the fourth-highest-grossing film of all time at the North American box office, and received considerable praise from critics. In retrospect, Whedon thought the film had "imperfections", begrudging its quality in comparison to that of "The Matrix" and "The Godfather Part II". Nonetheless, he felt he "pulled off" the endeavor of making a summer movie reminiscent of those from his childhood. In March 2012, Whedon stated that although television involves more