Several scholarly fields investigate the reuse of source texts, most relevantly adaptation studies and fanfiction studies. The limitation of these two fields is that adaptation studies focuses narrowly on retelling, usually in the form of film adaptations, but is not as well equipped to treat other uses of source material like prequels, sequels, and spinoffs. On the other hand, fanfiction studies has the broad reach adaptation studies lacks but is generally interested in "underground" production rather than material that goes through the official publication process and thus enters the...