The concept of the megatext has undergone significant theoretical expansion over the past four decades, evolving from a narratological construct into a framework for understanding large-scale cultural and digital formations. Initially introduced by Christine Brooke-Rose (1981) to describe the background systems supporting fantastic narratives, the term was later developed by Damien Broderick (1995) to denote the shared body of genre conventions that enable communication between science fiction writers and readers. Subsequent scholarship, including The Encyclopaedia of Science Fiction, consolidated this view by defining the megatext as a collective repository of tropes and narrative practices. Despite this sustained scholarly engagement, there remains no unified typological framework that adequately accounts for the megatext’s transformation under contemporary digital, transmedia, and large-scale informational conditions. In the twenty-first century, Allen Stroud (2018) extended the concept to participatory and transmedia fantasy cultures, while Bradley J. Fest (2017, 2021) reconceptualized the megatext as a materially and digitally vast aesthetic object marked by scale and partial unreadability. This paper traces the historical development of the concept, proposes a typology of megatexts, and argues that the megatext functions both as a mode of literary communication and as a model for understanding contemporary informational totality.
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