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 1999 episode "Hush". The 2001 episode "The Body" was nominated for a Nebula Award in 2002, and the fall 2001 musical episode "Once More, with Feeling" was nominated for a Best Dramatic Presentation Hugo Award and a Best Script Nebula Award. The final episode "Chosen" was nominated for a Best Dramatic Presentation, Short Form Hugo Award in 2003. All written and directed by Whedon, they are considered some the most effective and popular episodes of the series. Scholar A. Asbjørn Jøn recognized that the series has shifted the way vampires have since been depicted in popular culture representations. Since the