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 private detective in order to "help the helpless". Though praised for presenting a unique and progressive version of the archetypal noir hero as a sympathetic vampire detective, it was criticized as being lesser than its parent show, in context of having been derived from a more popular original work. Despite this, it won a Saturn Award for Best Network TV Series and the three episodes "Waiting in the Wings", "Smile Time" and "Not Fade Away" were nominated for Hugo Awards for Best Dramatic Presentation, Short Form in 2003 and 2005. The WB Network announced on February 13, 2004 that "Angel"