Sonic has declared he is no longer friends with Mario because of Sonic's need for action and Mario's urge to settle down with Peach. So Sonic runs off back to his world, only helping his own world. But on the way there, he stumbled upon the Fire Emblem world when Tabuu took that world, and Sonic accidentally with it. He eventually got lost and thought he was wrong about being friends with Mario just because of what they do. It's what they are. Then by the final battle of this movie, when Tabuu was going to destroy all the fighters, both main and back from being trophies, Sonic saved them and "spin-dashed" Tabuu, and giving Mario help.
Fan Casting
Ben Schwartz
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