The focus of this thesis is how fanfiction, an underground subculture of web literature written about popular books, films, television shows, and comics, treats the original works it derives from. In this study I will examine the ways in which fans reshape the original stories of the works they write about, and the ways in which they do not, and speculate the reasons they have chosen to do so. This project examines fanfiction surrounding three young adult novels: Twilight, The Hunger Games, and Harry Potter. I examine each of these works and their respective fanfiction in order to highlight important themes in each work and problems inherent in each story to account for the changes fanfiction writers make in their literature. I have chosen one overarching theme in the fanfiction in each fandom and will explore why fanfiction authors have overwhelmingly chosen to change the source material to suit that theme.