The League of Extraordinary Gentlemen is a comic book series written by Alan Moore and illustrated by Kevin O'Neill, first published in 1999. According to Moore, the concept behind the series was initially a "Justice League of Victorian England" but quickly grew into an opportunity to merge all works of fiction into one world. Moore and O'Neill have stated that they plan to map out many different eras in the League series. Elements of Volume I were adapted and used in an eponymous feature film released in 2003.