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Creation

Mickey Mouse was created as a replacement for Oswald the Lucky Rabbit, an earlier cartoon character that was created by the Disney studio but owned at the time by Universal Pictures. Charles Mintz served as a middleman producer between Disney and Universal through his company, Winkler Pictures, for the series of cartoons starring Oswald. In a February 1928 meeting with Mintz to renew the Oswald contract, Disney was met by a disappointing budget cut proposal, along with Mintz's revelation that several of the most important Disney animators were coming over to his studio. Among the few who stayed at the Disney studio were animator Ub Iwerks, apprentice artist Les Clark, and Wilfred Jackson.

A new character was workshopped out of necessity and in relative secret. Various myths exist of Walt Disney's inspiration for Mickey (including some which were likely ghostwritten), such as that the starving artist drew inspiration from a tame mouse (or pair of mice) at his desk at Laugh-O-Gram Studio in Kansas City, Missouri, or that he undertook a romantic search for inspiration on the train ride home from his disappointing meeting with Mintz. At Disney's behest, Iwerks sketched new character ideas based on various animals such as dogs and cats, but none of these appealed to Disney. A female cow and male horse were rejected, as was a male frog. In 1925, Hugh Harman drew some sketches of mice around a photograph of Walt Disney, reputedly based on Disney's own designs (similar to those he included on family birthday cards). These inspired Iwerks to create a new mouse character for Disney.

"Mortimer Mouse" had been Disney's original name for the character before his wife, Lillian, convinced him to change it. It has been speculated that Disney saw the name on a similarly named Performo toy. Additionally, actor Mickey Rooney claimed that during his time performing as the title character of the Mickey McGuire film series (1927–1934), he met Walt Disney at the Warner Bros. studio, inspiring Disney to name the character after him; however, Disney Studios was located on Hyperion Avenue at the time, with Disney conducting no business at Warner Bros.

The first feature-length movie with dialogue sequences, The Jazz Singer starring Al Jolson, was released on October 6, 1927. Several additional talkies followed, and movie theaters began installing the necessary equipment. Walt Disney reputedly discussed making sound cartoons in late May 1928. After composer Carl W. Stalling initially voiced Mickey for the 1929 talkie shorts The Karnival Kid and Wild Waves, Disney himself provided the often-shy falsetto voice—a large part of the character's onscreen persona.