Mr. Wilson and Dennis' father plan a secret early-morning fishing trip without Dennis, but he suspects something is afoot due to various clues they leave. Their sleep the night before is disrupted by Dennis' restless curiosity.Watch Now:Amazon
Dennis successfully eludes a babysitter and sneaks out of the house to go to a cowboy movie that his parents are also attending.Watch Now:Amazon
Mr. Wilson attempts to teach Dennis about bird watching. Dennis takes care of a sick bird, which proves to be the first of its species ever found in their region, prompting a visit by an excited bird club official.Watch Now:Amazon
George and Dorothy's nightly television viewing has been getting interupted by Hazel who's excuse is that her television set in her room is broken. This leads to George taking her down to the store to by her one, which is where she decides to get a color TV and quickly becomes the talk of the town.
Jan comes down with a mysterious allergy and Carol and Alice try to determine just what is causing it. They deduce that the cause is Tiger, the family dog. Or is it?
Dennis tries to fix up his Grandpa Perkins with Miss Cathcart and other ladies in the neighborhood.Watch Now:AmazoniTunes
Dennis helps Mr. Wilson sell a neighbor's house.Watch Now:Amazon
Mr. Wilson returns from a camping trip, inspiring Dennis and Tommy to camp out in the backyard. That night, Mr. Wilson mistakenly thinks the circus train has crashed and the animals have escaped, but the noises are only the Mitchells' neighbor playing a sound-effects record.Watch Now:Amazon
While the Baxters are out for the evening, Hazel entertains dinner guests who arrive at their house on the wrong night.
Dennis thinks his father is broke, so he sells bottles in an attempt to make some extra money while informing the neighborhood of the Mitchells' dire straits.Watch Now:Amazon
Dennis and Tommy fix a fallen street signpost but fail to notice they've put it up with the street names facing in the wrong direction.Watch Now:Amazon
When his parents won't buy him his own bicycle, Dennis attempts various ways to get one on his own, including guessing beans in a glass bowl.Watch Now:Amazon
A competitor of Dorothy's is trying to get her to join her interior decorating business but Dorothy is content with her own small business despite few customers. This prompts Hazel to try to influence the new neighbors into hiring Dorothy to furnish their home.
While trying to teach Harold how to kick a football, Hazel realizes that what is needed in town is a playground for the children. This leads her to go all out to try to get one despite George and his clients' opinion.
Henry tells Dennis that he and the family are moving to New York in order to keep Mr. Wilson in town for an award he is to receive. Dennis then informs the neighborhood of their supposed move.Watch Now:Amazon
Dennis gets a pet duck that causes havoc in the neighborhood.Watch Now:Amazon
Dennis goes to any length to get his own TV. Meanwhile, Mr. Wilson gets a remote control for his, which Dennis takes advantage of.Watch Now:Amazon
Dennis asks a reporter to write a story about his dad with hopes of getting his picture in the paper.Watch Now:Amazon
Dennis winds up babysitting a little boy who is a guest of the Wilsons after his father and Mr. Wilson mistakenly both cancel their respective sitters.Watch Now:Amazon
The Driscolls are new neighbors, but problems arise as their phone is on a shared line with the Mitchells. Henry gets angry at Mr. Driscoll for monopolizing the line, not realizing that Dennis and his friends actually were the ones using it, and furthermore that Mr. Driscoll is a valued client of Henry's company.Watch Now:Amazon
It's that time of the year when Hazel begins warming George up to the idea of a raise but this year, he absolutely refuses, leaving Hazel furious. Later, when Hazel falls and hurts herself, she decides to draw up a will, but George thinks she's planning a lawsuit against him.Watch Now:Amazon
Dennis is going crazy trying to find his gifts, which include a new sled.Watch Now:Amazon
Dennis meets Whip Crawford, his cowboy idol, after Mrs. Webster tells Dennis that Whip will be in the community pageant.Watch Now:Amazon
Dennis meets Mr. Wilson's sister, Helen who reads the book Treasure Island to Dennis and his friends, and they become fascinated with buried treasure. Mr. Wilson draws a treasure map to trick the boys into tilling his garden plot.Watch Now:Amazon
Dennis has nobody to play with after Joey goes home. Since nobody can drive him, he decides to walk to his grandfather's house but is stopped by the police. At the police station, he refuses to tell his name, is given ice cream, and causes further havoc including putting cement in Mr. Wilson's bowling ball and accidentally handcuffing an officer.Watch Now:Amazon
Dennis starts a rock collection and ends up finding what he thinks is real gold on Mr. Wilson's lot.Watch Now:Amazon
Mr. Wilson tricks Henry out of playing golf so that he'll spend more time with Dennis, and Dennis won't bother Mr. Wilson. Meanwhile, Dennis and Tommy try to deal with a hole Dennis accidentally put in the fish tank.Watch Now:Amazon
Mr. Wilson purchases a rare coin for $250, but Dennis finds it and throws it in a wishing well, which was the town fountain.
Dennis sells Valentine's Day cards in July to by swim fins, which end up causing a run on Valentine's day cards around the entire neighborhood.
Hazel is putting on a trick bowling exhibition at the bowling alley and tries to get Frank Gifford to attend.
Harvey Griffin becomes involved in a possible business merger between him and George thanks to Hazel.
Mrs. Holland tells Dennis that anyone who collets the most newspapers for a paper drive will win a 1985 silver dollar. Mr. Wilson finds out and wants it for his coin collection.
Tommy has a saxophone that he doesn't want, so Dennis wants to buy it from Tommy's mother. When Mr. Wilson learns that Dennis is going to ask Henry to buy it for him, Mr. Wilson tries to talk Henry out of it.
Dorothy goes away for a couple days to visit her sister and George gets down in the dumps so Hazel tries to cheer him up.
Hazel's friend Laura wants to get the attentions of a new gardner in the neighborhood but has some trouble doing so. This leads her and Hazel to take a class in changing your personality. Soon, Hazel begins doing so to hers and begins doing just what the instructor tells the class, shower everyone with compliments. However, Hazel's constant complimenting gets her into hot water with George and Dorothy.
While Dorothy is away on a trip, Hazel sees George having dinner with a pretty woman and jumps to the wrong conclusion.
George's nephew, Kevin and his wife break up after she discovers that he is having an affair, so as usual, Hazel steps in to try to get the two back together.
Mr. Wilson has a bunch of starlings in his tree and wants to get rid of them. Dennis eventually gets rid of the starlings by putting liver in Mr. Wilson's tree which attracts a lot of cats.