Tony Dinero enlists Mickey to watch the shop while he's away at lunch. Unfortunately, Beppo the Gorilla escapes from his cage and uses Minnie as Fay Wray in a King Kong imitation.
This short marks the last time to have a song-and-dance routine in the middle of a Mickey Mouse short. By this point, song-and-dance routines were now considered old-fashioned as Disney traded them in for more story-driven narratives in the next short, Giantland.
This is the Second Time Beppo kidnaps Minnie, The first time was in The Gorilla Mystery.