In earlier movies (and future ones as well), whenever a character takes Polyjuice Potion, their voice does not change to sound like that person and they continue to sound like themselves. However, when Barty Crouch Jr. takes Polyjuice Potion to look like Mad-Eye Moody for almost a year, his voice always changes to sound like Moody's. It should be noted that in the books, your voice does change when you take Polyjuice Potion to sound like that person.

Film

Harry Potter e il calice di fuoco (2005)

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