Oswald the Lucky Rabbit Mouse cartoon to be filmed was "Plane Crazy" in the summer of 1928, but it was produced as a silent and held back from release. The first Mickey Mouse film with a synchronized soundtrack, "Steamboat Willie", reached the screen that fall and became a major hit, eclipsing Oswald. "Plane Crazy" was later given its own synchronized soundtrack and released on March 17, 1929. Mintz, meanwhile, opened his own studio consisting primarily of former Disney employees, where he continued to produce Oswald cartoons, among them the first Oswald with sound, "Hen Fruit" (1929). While things were going in Mintz's favor, animators
Oswald the Lucky Rabbit acres of land in the desert. They also invested in an oil-drilling venture. Iwerks also invested his income in several stone mills to crush paint pigment he used to make paint formulas that were utilized by animators for decades. As time passed, Disney feared that Mintz would forgo renewal of the contract, partly due to Iwerks informing Disney that George Winkler, at the behest of Mintz, had been going behind Disney's back during pick-up runs for Oswald reels and hiring away his animators. Eventually, Walt traveled with his wife Lilly to New York to shop the series to other distributors,