Fantastic Beasts: The Secrets of Dumbledore is a noticeable step up from its predecessor, which is in no small part down to veteran Harry Potter screenwriter Steve Kloves. The future of the Fantastic Beasts series is still doubtful after The Secrets of Dumbledore became the lowest-grossing movie in the Harry Potter universe. The box office failure of Fantastic Beasts 3 though, shouldn't be attributed to the movie's screenplay, which had a significant boost from the Harry Potter franchise’s secret weapon.
Though J.K. Rowling wrote all the Harry Potter books, screenwriter Steve Kloves adapted all but one of the subsequent movies. J.K. Rowling switched from author to screenwriter for 2016's Fantastic Beasts and Where to Find Them and 2018's Fantastic Beasts: The Crimes of Grindelwald. While the first Fantastic Beasts movie was relatively well-received, the critical reception of The Crimes of Grindelwald was far more scathing. Its low-stakes plot was needlessly complicated and full of holes, while the introduction of too many new characters meant that most of them were given little to do. By the time Fantastic Beasts: The Secrets of Dumbledore was announced, it became clear that the Harry Potter prequel series needed to be reinvigorated.
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Bringing in Harry Potter's main screenwriter Steve Kloves to co-write Fantastic Beasts: The Secrets of Dumbledore was a wise creative decision by the Fantastic Beasts producers. Adapting the Harry Potter books gave him a valuable understanding of the cinematic qualities that a screenplay needs, as opposed to the structure of a novel, which The Crimes of Grindelwald often feels like. His knowledge of the Wizarding World
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