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 of my time. We never [wanted] to make the same movie; none of us knew that". Whedon also pitched a screenplay to adapt Batman for the same company as development started on what would eventually become "Batman Begins". It was described as having included a new, "more of a 'Hannibal Lecter' type" villain, and portrayed Bruce Wayne as "a morbid, death-obsessed kid" whose grief was overcome by protecting a girl from being bullied in an alley similar to where his parents were murdered. In March 2017, Whedon was in negotiations to direct, write, and produce "Batgirl" set in the DC