The Kingdom Hearts franchise is known for merging Square Enix and Disney characters. The games somehow take the serious and often dark designs of Square Enix and seamlessly insert them into the more whimsical worlds created by Disney. A leak from a reputable source indicates that Sora and the gang nearly got transported into the world of a very unexpected Disney creation.
Kingdom Hearts superfan 13th Vessel revealed the information on X (formerly Twitter): "It looks like Cars was originally considered for KINGDOM HEARTS III." According to some leaked footage and files from Kingdom Hearts 3, the world list originally contained the entry カーズ（仮）, which translates to "Cars (Tentative)." This implies that Square Enix was tentatively considering sending the protagonists of KH3 into the world of the Disney/Pixar movie Cars.
Every time the Kingdom Hearts protagonists travel to a different Disney world, they change to resemble the residents of that world. This means, as YouTube user windy4566 puts it in a comment on 13th Vessel's video on the leaked footage, "Somewhere deep in Square's [HQ,] there are concept drawings for car Sora and I'm not sure the world is ready for it."
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