Instead of writing, financing and producing single, one-off works – a novel, a movie or an interactive experience – generative AI tools enable storytellers to take a more economical approach. Writers define a storyworld, including characters, locations and sample storylines; and translate it into multiple media products using generative AI, building from low-cost formats like books, audioplays and graphic novels to film, tv series or games. This approach also lays the foundation for personalized experiences produced in realtime, e.g. to continue user-created storylines in roleplaying games or personalise experiences for therapeutic use. Taking the development of the Guardians of Naxos project as an example (a project aiming to empower students of Naxos to generate AR experiences), the presentation traces the path from AI-generated audioplays to generated illustrations, interactive dialogue and immersive scenes, building a pipeline for transmedia storytelling from script to interactive XR.