Mads Mikkelsen replaced Johnny Depp as Gellert Grindelwald in the Harry Potter prequel franchise’s third installment Fantastic Beasts: The Secrets of Dumbledore Mads Mikkelsen says it’s entirely possible Johnny Depp could return to his Fantastic Beasts role after his latest legal outcome. Depp, 59, last played Harry Potter villain Gellert Grindelwald in 2018’s Fantastic Beasts: The Crimes of Grindelwald …