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Luca cements itself in the shared Pixar universe through Pixar Easter eggs and references.
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So upon its release, Luca automatically fit into the shared universe. By the time she was an old woman, she became the witch from Brave. Negroni initially came out with the Pixar Theory in 2013, but has been able to easily place all movies released since then somewhere into the theory. She spent her entire life learning magic and wrapped up in this mission.
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She remembered the magic of the doors that allowed him to enter her world, so she learned how to harness them in order to travel across space and time to search for him. But the heart of this theory is Monster s, Inc's Boo. According to Negroni, she made it her life's mission to find Sully after he left her at the end of Monsters, Inc. That radiation brings animals and machines to life. This leads to the near-mass extinction of humans and the exodus of its survivors off the planet. The Pixar theory is focused on the Toy Story franchise's Buy n Large, which is a mega-corporation that ends up poisoning the planet with toxic waste. According to Negroni, each movie that chronically falls in between the two chronicles the fall of humanity and the rise of machines and animals. The setting of Pixar's canon is spread over millions of years, starting with Good Dinosaur taking place about 65 million years in the past and ending with the Monsters, Inc.franchise, which is set thousands of years in the future.
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While it's never been confirmed as canon by Pixar, Negroni's theory has been widely accepted by fans. The Pixar shared universe stems from the popular fan theory by Jon Negroni simply dubbed, the Pixar Theory.
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