Mickey Mouse is more than just a character; he’s an iconic figure for the Disney brand. But he almost didn’t exist. Mickey Mouse was only created to replace Walt Disney’s original successful creation, Oswald the Rabbit. Oswald was made by the Disney studio for Charles Mintz, a film producer and distributor through Universal Studios. With so much success from Oswald, Disney asked Mintz to increase the studio’s budget, but instead, Mintz demanded Walt take a 20 percent cut. He then reminded Disney that Universal owned Oswald and that he had already signed most of Disney’s current employees to his new contract. Disney refused to sign the new contract, finished the final Oswald comic of his contract, and ended his work with Universal.

With just himself and two loyal animators, Ub Iwerks and Les Clark, Disney had to start from scratch. From this experience, he learned to ensure he owned all the rights to characters produced by his company. His inspiration for Mickey came from a tame mouse at his desk at Laugh-O-Gram Studio in Kansas City, Missouri. The original name for the character was Mortimer Mouse until his wife, Lillian, convinced him to change it, ultimately creating Mickey Mouse.

On May 14, 1928, Mickey appeared in a test screening of the cartoon short “Plane Crazy”, but failed to impress audiences and attract distributors. Walt then produced a second Mickey short called “The Gallopin’ Gaucho”, which also suffered from a lack of distributor interest. “Steamboat Willy”, first released on November 18, 1928, in New York, was co-directed by Walt Disney and Ub Iwerks. Intended as a parody of Buster Keaton’s “Steamboat Bill, Jr.”, it was the third Mickey film produced and the first to find a distributor, serving as Mickey’s debut.

:https://nationaltoday.com/mickey-mouse-day/