A few years later, Disney discovered that Winkler and her husband, Charles Mintz, had stolen the rights to Oswald, along with all of Disney’s animators, except for Iwerks. Right away the Disney brothers, their wives and Iwerks produced three cartoons featuring a new character Walt had been developing called Mickey Mouse. The first animated shorts featuring Mickey were Plane Crazy and The Gallopin' Gaucho, both silent films for which they failed to find distribution. When sound made its way into film, Disney created a third, sound-and-music-equipped short called Steamboat Willie. With Walt as the voice of Mickey, the cartoon was an instant sensation.