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 and work as a movie, which meant I had to cope with problems like introducing nine main characters who'd already met!" The script was based on unused story ideas for "Firefly"s unfilmed second season. On writing the dialogue, Whedon felt that part of it came from "getting to invent the language", which "once I had ... reads like a kind of poetry". The narrative centers on Captain Malcolm Reynolds as the hero accompanied by River Tam acting as the catalyst for what he does. The score was composed by David Newman, and according to Whedon was intended to "deglorify space—to