Mr. Wilson is painting his house and Dennis invites himself over to help out. Needless to say, Dennis' "helping" gets Mr. Wilson close to a nervous breakdown. Dennis accompanies Henry to an auto showroom, where Dennis harasses the poor salesman so, that Henry buys a new car almost to avoid a law-suit. He discovers that the purchase entitles him to watch the actual car being built on the assembly line, with the hapless salesman acting as their guide. Now Dennis turns his impulsiveness toward the robot assembly line, screwing it up completely, and their "new" car comes ...

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An alien from another planet lands in Dennis room in a quest for peace and quiet... but Dennis wants to show him around! A mad romp ensues with Dennis taking the alien to Mr. Wilson's house. When Wilson calls the police he is thought to be a quack and carted away. Dennis and his family go on a trip on a train, however Dennis forgets his suitcase. Mr. Wilson, trying his best to make sure Dennis leaves, runs onto the train to give him the suitcase... but, he cannot get back off and is now stuck with Dennis on the train! While there, Dennis sees a man with a trenchcoat ...

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Mr. Wilson slips on Dennis' skateboard and has to go to the hospital. Once there, Dennis arrives to cheer Wilson up... Wilson is in for the time of his life! The kids discover an abandoned old gothic house that Dennis decides would make a great club-house. The kids begin cleaning the place up until a pair of ghosts appear! The others want to leave the place, but Dennis who never once sees the ghosts chides them for being scaredy cats, and gets them to stay. Finally the "ghosts" are revealed as a couple of crooks who are using the old house to hide their ill-gotten ...

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They're shooting a "Jaws"-type movie at the beach, when the remote control falls into the mechanical shark's mouth, and it zooms off. Dennis finds the fake shark, and crawling inside it, has fun frightening his friends. The shark talks to amazed Mr. Wilson, who summons the press, claiming he's found a talking shark! Naturally, he looks foolish when Dennis climbs out of it. Henry takes Dennis and Joey to a drive-through Lion Country Safari-type place... then, thanks to Dennis, the car breaks down. He locks the kids in, while he heads back on foot, making them promise ...

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Dennis and his family visit Mt. Rushmore, which is in the middle of being renovated. Dennis scales the scaffolding in an effort to help out. There he meets an old man holed up in one of the president's nostrils. Dennis wants to help the old man. A chase ensues with the workers trying to catch Dennis. With the old man's help the scaffolding is blown away with dynamite and a fifth face appears on the mount... Dennis goes to the local lake with his parents to do some fishing. He is very happy to get away from Margaret for a few days-however, once at the lake he finds ...

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Dennis goes fishing with Mr. Wilson, who's out to finally catch "Old Gramps", smartest trout in the whole lake. After a number of zany mishaps due to Dennis' over-eagerness, Wilson manages to hook the prize-winning fish -- only to have Dennis cause it to escape back into the water. When Mr. Wilson gets his hands on a radio that PeeBee has invented -- one that seems to predict future event-his mind races with thoughts of great wealth. But a garbage truck has accidentally carried off the radio, and now Ä with Dennis along - Wilson races to follow the garbage truck. It's...

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Mrs. Wilson has bought George a gift membership at a Health Spa. Dennis accompanies Wilson on his first visit, where he proceeds to drive poor Wilson nuts, speeding up his exercycle, pouring bubble bath in the spa water, etc. Finally the management tears up Wilson's membership. Grateful that he won't have to go back, he buys Dennis, and himself, a huge fudge sundae. Henry is sent to Alaska to track down a crash-landed satellite. Dennis, Ruff, and Joey stowaway along on the trip, and after misadventures involving Eskimo kayaks, icebergs, etc., Dennis discovers the "...

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Dennis brings home a stray kitten which Alice makes him turn over to the Wilsons. But the "kitten" is actually a baby mountain lion, which proceeds to wreck the Wilson's home. Things get worse when it's angry mother shows up, looking for its cub!. Mr. Wilson takes Dennis and Joey to the circus and ends up being the main event. His unwitting participation is a big success which spoils a former ringmaster's efforts of revenge. Dennis and Tommy set traps for the Mudville Swamp Monster while Margaret whines, but allows them to use her "tracking equipment." The monster ...

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Dennis is made the prop man for the community theater whereupon he turns a serious drama into a roaring comedy. When Henry takes Dennis and the gang on a tour of his aerospace company, the gang slips away. They find a rocket ship and decide to investigate. Once inside, Dennis hits a button and WHOOSH! they are blasted into outer space. There they encounter meteor showers, hyper-space, etc. Fortunately, the kids discover that they aren't in a real rocket -- but a "Flight Simulator!". Dennis finds an East Indian flute, that causes objects to rise and dance, snake-like. ...

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When Henry and Alice leave to go to a "Poor People's" charity auction, Dennis decides to help the poor people by selling most everything in the Mitchell household. Mr. Wilson, who is supposed to check on Dennis but arrives late, is shocked when he sees what Dennis is doing. So, he and Dennis go on a madcap scavenger hunt throughout the neighborhood to retrieve the pieces Dennis has sold before Henry and Alice get back home. By the time they get back with all of the pieces, Henry and Alice arrive with lots of "new" junk. So much so that Henry declares that maybe they ...

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Slippery ice causes chaos when Henry and Dennis set out to make a snowman. After tumbling and sliding all over the ski resort, they end up as part of a snowman and receive hot cocoa for their efforts. Joey gets soaked with PeeBee's newest solution and he disappears. His shoes escape the solution and the tow is terrified by a pair of shoes walking around. Mrs. Wilson suggests a bath might restore Joey to sight, which it does, but not before Mr. Wilson is duped. Dennis "helps" his father build a new playroom onto the house. Chaos reigns as Mr. Wilson laughingly looks on.

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Dennis keeps his eye on the secret solar powered moonwalker for his Dad. But when Joey touches the wrong button, it takes them for a stop-and-go-ride around town, eventually leading two crooks who want to steal it to the police. Dennis and Joey build a raft to go down the local river. With Margaret as the unwilling guest, they proceed down the rapids, the Margaret forever watching out for her new hairdo. The kids are able to survive the wildest of adventures, and it isn't until they walk back home that Margaret finally has her hair soaked by way of Mr. Wilson's garden...

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Dennis visits a supermarket and completely dismantles it. The Mitchell's visit New York. The Statue of Liberty will never be the same. The gang goes to the beach and decide to look for treasure with a metal detector. Once there, a bully tries to take it away from them. Ultimately, Dennis saves the bully from danger by way of the metal detector's powerful magnet.

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Henry's father comes to visit, and he tells Dennis what Henry was like as a little boy. Not surprisingly, the child-sized Henry and the present-day Dennis had a lot in common. They both create chaos wherever they go. Dennis and PeeBee enter a friendly challenge of building and flying their own airplanes. Dennis' turns out to be a rickety old thing, while PeeBee's makes a Lear jet look like scrap metal. Once in the air PeeBee flies rings around Dennis, making him look bad. However, in the end, PeeBee's plane malfunctions and Dennis has to rescue him. Dennis ultimately ...

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Dennis, George, Henry, and Joey all enter a balloon race. Dennis wins the race, but only after a wild series of adventures. A take-off on King Kong, in which PeeBee, experimenting with a gas-filled balloon, loses control of it, and he, Dennis, Margaret, and Joey, are carried off, ending up on a banana-shaped island. There they meet a giant ape, who falls instantly in love with Margaret. Returning home by raft, they put the giant ape in show biz, doing a ballet dance duo with Margaret. During the show, the ape panics... and so does the audience! The ape climbs a high ...

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When Ruff upsets one of PeeBee's experiments, the dog and Joey end up with their brains switched, Ruff can speak, while Joey can only bark! PeeBee and Dennis chase them around town, trying to capture them and re-switch their brains back to their owners. The kids meet a looney Professor at the Science museum who has built a time machine that is ever so close to actually working. When their teacher tells the kids that they must have a science project turned in the next day, Dennis gets the wild idea of going back in time and taking actual photographs of actual dinosaurs...

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Mrs. Wilson will not return until Mr. Wilson gets rid of all the mice. PeeBee's special mousetraps are regarded as circus rides by the mice and they come from everywhere to play, which costs Mr. Wilson a lot of quarters, the price he pays to the boys for each mouse captured. A take-off on the "Wizard Of Oz", in which Dennis and Ruff are carried off to Munchie-Land by a cyclone... there they meet Joey, PeeBee, and Gina, each looking for Courage, a Brain, and a Heart, respectively. Before reaching the City of Odd, they escape the clutches of Margaret, the wicked Witch. ...

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Dennis and his parents visit the beautiful ranch of his favorite Uncle Bud. Uncle Bud has always wanted to win the local rodeo, and Dennis helps him out by riding the wildest bronc in six counties!. Henry's company has developed a sophisticated self-inflating tent to be used by space explorers on the moon. An Army General, anxious to see if the tent actually is "simple enough for a child to operate", insists that he be allowed to borrow Dennis for an over-night camping trip. Before the camping trip is over, Dennis has the poor General cornered by a hungry grizzly, ...

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Dennis buys a magician's hat and gives it to Margaret at her cello recital. The hat goes wild, spewing frogs and rabbits all over the place, creating all kinds of comedy. Dennis and George Wilson take the wrong vacation plane and end up in South America, being pursued by Mayan natives. They have all kinds of wild adventures trying to get back home. Dennis, Ruff, and Henry visit a city power plant. Ruff gets loose on the big control board, and Dennis chases him. They hit every power switch on the board, turning the entire town into a pinball machine.

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Dennis is blasted by a "strength ray" that Peebee has invented, and suddenly has super muscles. he goes around using his new-found strength to do various good deeds; rescuing kittens from tall trees, etc. Dennis challenges the town bully to a fight, not realizing that his super strength has worn off. But the bully proves to be a coward, and runs off anyway. The Mitchells and PeeBee visit Gold Field Air Force base in the desert to watch a test flight of a rocket plane developed by Henry's company. More interested in finding gold, Dennis and PeeBee stumble upon some ...

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A blob from outer space enters various forms tree, Ruff, Alice, Henry, Mr. Wilson, baseball in search of a good place to plan an invasion. But Dennis manages to make the blob uncomfortable no matter where it hides. The invasion is called off since the blob feels a planet full of people like Dennis is unconquerable. Henry and Alice take Dennis to a western-type theme park, where he sees a re-enactment of a stage-coach hold up. Think the hold up is real, Dennis leaps aboard the getaway stagecoach to stop them, and ends up at a boarded-up Ghost Town Saloon. There Dennis,...

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On a bicycle-built-for-two Henry and Mr. Wilson race after Dennis, Margaret and Joey who have accidentally taken flight in Henry's newest invention, a dirigi-blimp. It's the men who need rescuing however, after pedaling over a cliff, disturbing a bear and hornets and ending in a swamp. Dennis and Henry enter a variety of contests at a father-son picnic. Despite the ruthless efforts of a crooked father-son team, the Mitchells triumph, winning the first prize trophy. Dennis and Ruff try to capture a backyard squirrel and fail hilariously. Dennis eventually decides it's ...

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After making the barber's guard dog sick, Dennis volunteers Ruff for watch dog. When bank robbers next door drill a hole in the wall of the barber ship to escape through, Dennis and Ruff capture them but make a shambles of the barber shop. Dennis, his parents, and the Wilsons visit an Army base in Arizona. Somehow, Dennis and George Wilson become trapped in a runaway, computerized tank...which is headed straight for the Grand Canyon!. The Mitchells return to the lodge where they spent their honeymoon. Dennis brings his frog and causes so much disturbance that they are...

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Dennis accidentally locks the keys in the car while out in the country with Mr. Wilson for a demonstration of homing pigeons. Dennis ties a note to the pigeon which gets stuck in a tree and then Mr. Wilson gets stuck after freeing the bird. Mrs. Wilson arrives with the fire department after seeing him on the news. PeeBee's newest invention accidentally makes four more of Dennis to the terror of Margaret, Mr. Wilson, and his parents. PeeBee and the original Dennis lure the clones back into the invention with an ice cream truck bell and the neighborhood is restored to "...

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Wrapped head to toe in bandages while playing hospital, Joey gets picked up by an ambulance and taken to the hospital. Dennis and Margaret attempt to rescue him and make a shambles of the hospital corridors. Dennis makes friends with an old horse named Horace. He rides him in the Town Derby, and they win spectacularly. The Mitchell's visit Pamplona, Spain just before the running of the bulls. But Dennis accidentally releases the bulls a day earlier, and Henry finds himself chased into a bull ring. He fights off literally hundreds of bulls, becoming the greatest ...

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After Dennis gets his father stopped by a policeman, Ruff swipes the cop's hat and Dennis and the cop chase him through the city streets leaving a mess in their wake. Dennis stops a bank robber when Ruff is found and is made an honorary policeman. When an aggravated Mr. Wilson tells Dennis to think of his house as gone, Dennis takes him literally and directs the house-movers to Mr. Wilson's house. Mr. Wilson returns to find his house gone with Mrs. Wilson inside! They pursue the truck and house and watch as it careens down a cliff settling in a beautiful, peaceful ...

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