Fun and Fancy Free
Disney had provided the voice for Mickey Mouse since his debut in 1928, and "Fun and Fancy Free" was the last time he would voice the role regularly, as he no longer had the time or energy to do so. Disney recorded most of Mickey's dialogue in the spring and summer of 1941. Sound effects artist Jimmy MacDonald would become the character's new voice actor, starting in 1948. Disney, however, did reprise the role for the introduction to the original 1955–59 run of "The Mickey Mouse Club".
Minnie Mouse
In 1928, Walt Disney and Ub Iwerks created Mickey Mouse to act as a replacement to his previous star Oswald the Lucky Rabbit. But Mickey could not fill the void alone. Among the few consistent character traits Oswald had developed before moving on to Universal Studios was his near-constant pursuit of potential sweethearts. So for Mickey to have a chance to emulate his predecessor at flirting, someone had to replace Oswald's many love interests. This replacement to Miss Rabbit, Miss Cottontail, Fanny and an uncertain number of unnamed nurses and dancers was to become Minnie Mouse.