It's been a decade since Disney's last Mickey Mouse short film was released in theaters, following an 85-year run. The Disney mascot and undisputed symbol of Disney, Mickey Mouse, is also one of the most famous and iconic characters of all time. He is quintessential Disney and has been around almost as long as the Walt Disney Company itself. After multiple attempts to introduce him in previous shorts failed, Mickey Mouse, whose original name was Mortimer Mouse, made his first official appearance in the animated short film, Steamboat Willie, in 1928.

https://screenrant.com/disney-mickey-mouse-last-movie-get-a-horse/