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 Buffyverse. Like many writers of the show, he contributed to the series' comic book continuation, writing for the anthology "Tales of the Slayers", and the main storyline of the miniseries "Tales of the Vampires". Whedon and the other writers then released a new ongoing series, taking place after the series finale "Chosen", which he officially recognizes as the canonical eighth season. Whedon returned to the world of "Fray" during the season eight-story arc "Time of Your Life". "Buffy the Vampire Slayer Season Nine" was published from August 2011 to September 2013, for which Whedon wrote "Freefall, Part I–II" (with