A household is inhabited by three feline characters: Sylvester, the paternal figure; Mrs. Sylvester, the maternal counterpart; and Sylvester Jr., affectionately referred to as "Spoiled Brat" due to his demanding disposition. The tranquil atmosphere of their domestic routine is disrupted when Sylvester Jr. expresses discontent with their porridge diet, yearning for the more traditional sustenance of mice. Seeking to remedy this culinary dissatisfaction, Sylvester proposes a walk in the woods to allow the porridge to cool.

During their absence, Goldimouse, distinguished by her distinctive curly blonde locks, seizes the opportunity to infiltrate the household through a diminutive entrance and consumes the porridge before reclining in Sylvester Jr.'s bed. Upon the family's return, they are greeted by evidence of Goldimouse's intrusion, sparking a humorous exchange concerning the altered state of their belongings.

Initially relieved by the absence of his porridge, Sylvester Jr. is unsettled upon discovering the intruder in his bed. Goldimouse, startled by Sylvester Jr.'s presence, seeks refuge with Sylvester, only to realize his true feline nature and hastily escapes through the tiny entrance.

Motivated by his son's insistence, Sylvester embarks on a series of futile attempts to remove Goldimouse from her refuge, culminating in comedic failures, including an ill-conceived explosives scheme. Upon his return to his son, Sylvester begrudgingly offers a breakfast of porridge, met with Junior's typical petulance.

The narrative concludes with Sylvester's evident exasperation, as he departs from the shelter, tacitly acknowledging Junior's persistent demands. The cyclical nature of the story is highlighted by Junior's renewed complaints about the porridge, emphasizing the enduring tension within the familial dynamic.

• Mel Blanc as Sylvester / Sylvester Jr.
• June Foray as Narrator / Mrs. Sylvester / Goldimouse (uncredited)

• Goldimouse and the Three Cats at IMDb