One of Iwerks' most long-lasting contributions to animation was a refined version of a sketch drawn by Disney that would later go on to become Mickey Mouse. Iwerks was responsible for much of the animation for the early Mickey Mouse and Silly Symphony cartoons, including Steamboat Willie, The Skeleton Dance and The Haunted House, before a falling out with Disney led to Iwerks' resignation from the studio in January 1930. Iwerks' final Mickey Mouse cartoon was 1930's The Cactus Kid. Following his separation with Disney, Iwerks, operating under Iwerks Studio, created the characters Flip the Frog and Willie Whopper along with the ComiColor Cartoons series as part of a contract with Metro-Goldwyn-Mayer, but the new studio failed to rival its competitors. Iwerks later directed two Looney Tunes cartoon shorts for Leon Schlesinger Productions and several Color Rhapsody cartoons for Screen Gems before joining Disney again in 1940, after which he worked with special visual effects on productions such as 1946's Song of the South.
One of Iwerks' most long-lasting contributions to animation was a refined version of a sketch drawn by Disney that would later go on to become Mickey Mouse. Iwerks was responsible for much of the animation for the early Mickey Mouse and Silly Symphony cartoons, including Steamboat Willie, The Skeleton Dance and The Haunted House, before a falling out with Disney led to Iwerks' resignation from the studio in January 1930. Iwerks' final Mickey Mouse cartoon was 1930's The Cactus Kid. Following his separation with Disney, Iwerks, operating under Iwerks Studio, created the characters Flip the Frog and Willie Whopper along with the ComiColor Cartoons series as part of a contract with Metro-Goldwyn-Mayer, but the new studio failed to rival its competitors. Iwerks later directed two Looney Tunes cartoon shorts for Leon Schlesinger Productions and several Color Rhapsody cartoons for Screen Gems before joining Disney again in 1940, after which he worked with special visual effects on productions such as 1946's Song of the South.