The fictional universe established by television series Buffy the Vampire Slayer and Angel and the film Buffy the Vampire Slayer has been parodied or paid tribute to by a number of unofficial productions, most notably fan films and adult films.
Several notable fan films have been inspired by the Buffyverse. Although 20th Century Fox and its licensees are the only organizations legally allowed to create any commercial products with the name and trademark Buffy and Angel, related fan films have become more common, as computer and digital technology has advanced, to allow films to be produced for less money. Furthermore, the growth of the internet has allowed such films a way be distributed amongst a potentially wide audience. This has led to several productions which have received hundreds of thousands of downloads, an entry on Internet Movie Database, and at least some attention from external media. In 2006, the periodical technology magazine, Wired featured a two-page article about several of these films. These films include Cherub, an internet series that parodies Angel; a machinima series produced by Foiled Productions; Fluffy the English Vampire Slayer, a short film described as "one of the first widely watched Whedonverse fan films"; and Forgotten Memories, an Australian production, written by Emma Paige Langley and directed by indie actor and director Darren K Hawkins. Buffy – The alliance, a French fan film by Lmpp Production is planned for shooting in May 2010.
The huge success of the Buffy franchise led to a number of erotic parodies in comic and film formats. None of these stories were licensed by 20th Century Fox as official Buffy merchandise, and none would be considered Buffyverse canon. These parodies have included:
The 2000 Friends episode The One Where Chandler Can't Cry shows a brief scene from the fictional Buffay the Vampire Layer.