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Ben Hammersley meets creators and fans to investigate how extended fictional universes, from Star Wars and Harry Potter to Game of Thrones, took over global culture. He examines the huge financial success of the world’s biggest franchises, and argues that their stories – the identity of Luke Skywalker’s father, for example – have become common cultural touchstones around the world.

To understand how these expansive fictional universes are created and maintained, Ben visits professor Dumbledore's office to talk to Stuart Craig, production designer on the Harry Potter films. He goes to Los Angeles to meet Lauren Faust, creator of My Little Pony: Friendship is Magic. And, he travels to San Diego Comic Con where he discusses a number of different universes with Marc Zicree, writer on numerous film and TV series, including Star Trek.

Ben also speaks to authors Robin Hobb and Warren Ellis, and to Axel Alonso and Ryan Penagos from Marvel. He hears from numerous fans, including Game of Thrones super-fans Linda Antonsson and Elio Garcia about the joys of fandom.

(Photo: A group of costumed fans attend Comic-Con International at San Diego Convention Center 2015. Credit: Getty Images)