This volume builds on previous notions of transmedia practices to develop the concept of transtexts, in order to account for both the industrial and user-generated contributions to the cross-media expansion of a story universe. On the one hand exists industrial transmedia texts, produced by supposedly authoritative authors or entities and directed to active audiences in the aim of fostering engagement. On the other hand are fan-produced transmedia texts, primarily intended for fellow members of the fan communities, with the Internet allowing for connections and collaboration between fans. Through both case studies and more general analyses of audience participation and reception, employing the artistic, marketing, textual, industrial, cultural, social, geographical, technological, historical, financial and legal perspectives, this multidisciplinary collection aims to expand our understanding of both transmedia storytelling and fan-produced transmedia texts.