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
Parenthood (1990 TV series) Huffners of the film were renamed the Merricks on the TV series. The pilot episode was considered by "USA Today" and the "New York Post" as the best movie-to-TV spinoff since "M*A*S*H". However, ratings for the series were low and "Parenthood" was canceled after 12 episodes. The series is notable for featuring a number of people who at the time were unheard of but later became famous. One of the writers on the show was Joss Whedon. The cast featured Leonardo DiCaprio, David Arquette, and Thora Birch (billed simply as "Thora" here). The show was featured on the now-defunct cable