As of this writing, the third film in director Denis Villeneuve’s “Dune” series has yet to receive an official greenlight. (The project technically remains in development.) Nonetheless, parent company Warner Bros. Discovery and producer Legendary Television have already begun the work of converting the movies’ billion-plus dollars in combined box office into a multimedia franchise; in fact, a TV spinoff was already in the works before “Dune: Part One” was even in theaters. This week, prequel series “Dune: Prophecy” finally arrives on HBO, following “The Penguin” in turning HBO — once the most rarefied of prestige outlets — into a reliable purveyor of blockbuster IP. Tasked with making more
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