Ezra Miller, Miller, a self-described “obsessive Harry Potter nerd,” explains how Fantastic Beasts relates to to the final book in the series, Harry Potter and the Deathly Hallows.
While the eight Harry Potter films were all based on prior books, the source material is rather thin for the Fantastic Beasts series.
Well, what excites Ezra Miller is that Fantastic Beasts takes place around the same time that Grindelwald was attacking Europe.
After all, with less source material to adapt, Rowling likely will look to include as many household names (at least to Potter fans) as possible.