The latest issue of the newspaper carries shocking news: a ferocious and brutal killer gorilla has escaped from the zoo. The paper warns citizens to lock their doors to avoid harm and offers a huge reward for the capture of the gorilla. Mickey (voiced by Walt Disney) reads this news with great anxiety. He calls his girlfriend Minnie (voiced by Marcellite Garner) to remind her to be extremely careful and not fall into the gorilla's hands. However, Minnie seems unfazed; she even plays a cheerful tune called "All Alone" on the piano over the phone to let Mickey know she is perfectly safe. 　　Perhaps Mickey is overly nervous, but Minnie might be too optimistic. Just as she is playing the piano, the gorilla sneaks into her yard and slowly approaches the singing Minnie. A piercing scream cuts through the night sky...