Dennis the Menace is a family comedy centered on the mischievous but well-meaning young boy Dennis Mitchell (Mason Gamble). Living in a quiet suburban neighborhood, Dennis is notorious for causing trouble, often unintentionally, for his grumpy next-door neighbor, Mr. George Wilson (Walter Matthau). Despite his antics, Dennis has a kind heart and adores Mr. Wilson, although his “help” often leads to chaos.
When Mr. Wilson prepares to host a garden party to showcase his prized flower, Dennis inadvertently sabotages the event, leaving Mr. Wilson frustrated and angry. Meanwhile, a sinister drifter named Switchblade Sam (Christopher Lloyd) arrives in town, stealing from residents and causing tension.
One day, Dennis crosses paths with Switchblade Sam, and his innocent curiosity leads him to become the unwitting target of the thief. However, Dennis’s cleverness and resourcefulness ultimately outsmart the criminal, leading to Sam’s capture and restoring peace to the neighborhood.
In the end, despite all the mayhem, Dennis wins back Mr. Wilson’s affection, proving that his intentions were always good. The film concludes with a heartwarming message about forgiveness, family, and the enduring bond between neighbors.