Question

What short film did Mickey Mouse first appear in

Answer 1

Mickey first appeared in the short film "Plane Crazy" («Безумный самолёт») on May 15, 1928.

Это если нужно первое появление персонажа на экране. А официально днём рождения Микки считается 18 ноября 1928 года. Именно в этот день был показан  мультфильм Steamboat Willie («Пароходик Вилли»).

Answer 2

Mickey Mouse first appeared in a short film titled "Steamboat Willie." It was released on November 18, 1928. This short film was one of the earliest sound cartoons and became significant as it introduced Mickey Mouse as well as his girlfriend Minnie Mouse. The film was also notable for being the first cartoon to feature synchronized sound. Mickey Mouse's creation marked the beginning of a new era for animation and brought great success to Walt Disney and his company.