Plane Crazy is an American animated short film directed by Walt Disney and Ub Iwerks. The cartoon, produced in 1928 by The Walt Disney Studio, was the first to feature the character Mickey Mouse. It was made as a silent film and given a test screening to a theater audience on May 15, 1928, but failed to pick up a distributor. Later that year, Disney released Mickey's first sound cartoon, Steamboat Willie, which was an enormous success. Following this, Plane Crazy was released as a sound cartoon on March 17, 1929. It was the fourth Mickey film to be released after Steamboat Willie, The Gallopin' Gaucho, and The Barn Dance (1929). This leads to some ambiguity as to which is the first Mickey Mouse cartoon, as Plane Crazy was the first to be produced while Steamboat Willie was the first to be released.