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
Tim Minear (which he also created, with Howard Gordon). Minear had another series, "Drive", airing on Fox in April 2007, however it was cancelled by the network after only four episodes. "Drive" was set to return with two additional episodes on July 4, 2007, but these were rescheduled to July 13 and then cancelled. This continued his tradition of short-lived work on Fox. Minear often works with Joss Whedon, and his work is typically characterized by a sharp, black humour and an ability to portray characters who are sympathetic and understandable, but morally ambiguous. An example of this is "Angel" Season Two,