Disney refused Charles Mintz's ultimatum and lost most of his animation staff, leaving only Ub Iwerks as his principal creative ally. The collapse of the Oswald arrangement was both a financial blow and a humiliating lesson in the dangers of working without ownership of a character. Universal later terminated Mintz's contract and allowed Walter Lantz to form an in-house animation operation, but Disney had already moved on. Working with Iwerks, he developed a replacement character, Mickey Mouse, whose exact inspiration remains uncertain. Disney supplied Mickey's voice in the early years, while Iwerks redesigned the provisional sketches into a figure that could be animated efficiently. The dispute over Oswald therefore became one of the pivotal reversals in animation history: Disney lost a successful creation, but the resulting break helped produce the character that made his studio internationally famous.
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