Emily Watson as Valya Harkonnen in "Dune: Prophecy."HBOHBO's "Dune: Prophecy" explores the origins of the Bene Gesserit sisterhood.The show is loosely based on a "Dune" prequel novel but expands past its scope.Showrunner Alison Schapker spoke with BI about bringing the franchise to the small screen."Dune: Prophecy" goes way back, thousands of years into the history of the powerful women who shaped the history of the entire "Dune" universe."Any 'Dune' fan knows it's just so endlessly deep in its lore, and its worldbuilding, and its specificity," showrunner Alison Schapker told Business Insider.