Mickey Mouse universe
In "Plane Crazy" (1929), the first produced Mickey Mouse story, Mickey is seen at a farm. In all of his early films Mickey is in a rural setting, but most commonly at a farm. This setting was succinctly presented in the first sentences of one of Mickey's first storybooks:
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.