Beppo the Gorilla is seen in one of the projector screens in Tomorrow City, that being the transition stages of Mickey's Mechanical Man. The original cartoon featured Beppo fighting a mechanical white robot named Champ created by Mickey Mouse.
In Scene One - Beppo is seen fighting Champ the Robot again and having the apparent victory smacking Champ's head in the boxing ring. While Champ's head springs up in the air, Mickey can get E-Tickets and a Film Reel above the ring.
In Scene Two - Beppo is seen losing the battle being jumped on by Champ on the back.