Mickey Mouse
Created as a replacement for a prior Disney character, Oswald the Lucky Rabbit, Mickey first appeared in the short "Plane Crazy", debuting publicly in the short film "Steamboat Willie" (1928), one of the first sound cartoons. He went on to appear in over 130 films, including "The Band Concert" (1935), "Brave Little Tailor" (1938), and "Fantasia" (1940). Mickey appeared primarily in short films, but also occasionally in feature-length films. Ten of Mickey's cartoons were nominated for the Academy Award for Best Animated Short Film, one of which, "Lend a Paw", won the award in 1942. In 1978, Mickey became the first cartoon character to have a star on the Hollywood Walk of Fame.
Jerry Mouse
On his own, Jerry Mouse appears in a fantasy sequence in the 1945 Gene Kelly MGM musical film "Anchors Aweigh". Jerry appears as the ruler of a kingdom where music is banned because he feels he lacks talent, and Kelly persuades the mouse into performing a song-and-dance number with him. Kelly and MGM had originally wanted Walt Disney's Mickey Mouse as Kelly's dance partner for the sequence, but Disney was unwilling to license the character.