Dennis the Menace Strikes Again!

At the Wilsons' house, Dennis presents George with a menagerie of pets for his birthday, including frogs, lizards, snakes, insects, a baby alligator, and more. The gesture is well-meaning but chaotic, setting up Dennis’s meddling presence. The family reacts with a mix of amusement and exasperation as the day begins.

Dennis’ lively gift-giving culminates in a mishap when George, in Dennis’ red wagon, rolls down the stairs. Martha accidentally gets a cake splashed in her face during the chaotic moment. The incident cements the rocky dynamic between Dennis and George.

Mr. Johnson announces that he is moving in with the Wilsons, adding another adult to the already crowded household. Dennis begins spending more time with him than with George, altering the family balance. The new living arrangement creates fresh tensions for everyone.

George is duped by two crooked con men who claim to sell a rare root that makes people younger. Dennis interrupts and reveals that he already owns a similar root, undercutting the scam. The encounter foreshadows later infatuations with youth and manipulation.

The Professor and Sylvester return and sell George a machine that allegedly makes people younger. The device triggers a reversal of attitudes, with Mr. Johnson enjoying a renewed sense of youth while George grows resentful of Dennis. The purchase escalates the neighborhood comedy into chaos.

While Dennis is trying to clean up a pile of garbage, he accidentally destroys George’s machine with a cotton candy mix that he mistakes for soap. Dennis is sent to his room, spanked by his mother, and ultimately grounded by his dad. The incident deepens the rift between Dennis and George.

George declares that he and Martha will move away from Dennis for good, signaling a potential exit from the neighborhood chaos. Mr. Johnson decides to move into the Wilsons' house, sealing a dramatic change in living arrangements. Dennis’s mischief has real consequences for everyone’s home life.

The Professor and Sylvester decide to exploit George’s desire to escape Dennis by pressuring him into a new scam to drain his money. Dennis helps the policemen catch them when the criminals pretend to be various workers at the Wilsons’ house. The caper highlights Dennis’s precarious mix of trouble and aid.

The police return the uncashed checks, nullifying much of the criminals’ plan. George decides not to move after Dennis begs him to stay, marking a fragile reconciliation. The neighborhood steadies, but the tension remains under the surface.

Mr. Johnson vows to retrieve his camper so he can take Dennis to the Grand Canyon, a last chance for adventure before any permanent changes. Dennis’s conduct continues to test Mr. Johnson’s patience and affection. The Grand Canyon plan becomes the film’s vehicle for a final misadventure.

In the camper at the Grand Canyon, Dennis tries to bring home a rock for George, accidentally taking the wrong one. The rock rolls down the incline with Mr. Johnson inside, creating a perilous moment. The sequence blends slapstick danger with a test of their bond.

Back home for Christmas, George and Martha learn of the accident via the news as Dennis explains the events to the camera. Mr. Johnson is airlifted to safety, and the community processes the crisis. Dennis delivers a parting shoutout to George, leaving him flabbergasted.

The film closes with Dennis addressing the camera, prompting George to mutter the iconic line, He’s a menace. The moment solidifies Dennis’s status in George’s eyes as a lovable, troublesome boy. The dynamic between neighbor and nuisance remains unresolved but endearing.