Factual error: When the Guardians start collecting the teeth, the skylines indicate that their first destination is Shanghai, but the billboard that the Tooth Fairy flies into is in a heavily Japanese visual style, from font weight to outlines and pastel colors. (00:37:05)
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Rise of the Guardians (2012)
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Directed by: Peter Ramsey
Starring: Alec Baldwin, Hugh Jackman, Chris Pine, Isla Fisher
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Answer: Jack is the guardian of fun. It's stated in the film.