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Television episodes built around the same sorts of incidents found in Hank Ketcham's long-running comic strip.

The store owner tries to keep a dog out of his store. He puts the dog outside, and when Mr Wilson leaves the store, he follows Mr Wilson home. Now, Mr Wilson tries to keep the dog out of his yard.

Mr. Wilson's plans for a quiet evening with his coin collection go awry when he unexpectedly has to babysit Dennis, Margaret, and Seymour.

A neighbor's cat is bothering Mr Wilson; he thinks cats are a nuisance. When he finds out there is an ordinance that requires cats to be licensed, he unwillingly volunteers to do the job of rounding them up.

While Henry is out of town Dennis wants his mom to have a nice birthday with lots of presents. Mr. Wilson sends him down to Finch's drug store to shop for his mom. When he goes down to Finch's drug store he ends up causing chaos down there with Mr. Finch and to make matters worse he puts a sign on him advertising people to get his mom lots of birthday presents.

Concerned that Eloise will be destitute if he should pass away suddenly, John Wilson hopes that his Aunt Emma will leave her money to him, so that he can in turn provide for Eloise. However, when Aunt Emma and Dennis become friends, Mr. Wilson fears that Dennis will inherit Aunt Emma's money instead.

When Dennis sees Mrs. Wilson knitting booties (for Mr. Wilson's golf clubs), he jumps to the conclusion that the Wilsons are about to have a baby, and innocently spreads the word all over town.

Mr. Wilson takes Dennis camping on a cold and windy mountainside, so that Dennis will be able to join the Junior Pathfinders and Mr. Wilson will improve his own odds of winning a Best Citizen award.

Hoping to be selected as a delegate to a bird lovers' convention, Mr. Wilson hosts a reception for the organization at his home. The program includes a special guest who does actual bird calls. However, after seeing a sign for the meeting in a music shop window, ("Remember the Bird"), two beatniks think the occasion is to honor a music legend, and they show up to turn it into a jazz program.

John Wilson and Henry Mitchell compete in the games at the community picnic.

Dennis and a boy that Mr. Wilson was responsible for are left without a babysitter after agreeing to let one sitter sit for the boys cause Mr. Wilson and Henry both end up canceling theirs.

Dennis wants his dad to be a hero so bad after Johnny Brady's dad always seems to get his picture in the paper for some heroic act. So Dennis tries to talk to the town reporter to put Henry's picture in the paper and make him a hero.

Mr. Wilson is eager for Dennis to go to summer camp. And when Henry is unexpectedly unable to take Dennis and several of Dennis's friends to visit the camp, Mr. Wilson is happy to step in, and takes them there himself.

When Dennis is appointed by the mayor to go to Washington, DC to ask their state senator to make the local forest a national park, Mr. Wilson believes his own Washington contacts can help.

Dennis sneaks out on his sitter to go to the movies where his parents are and causes trouble at the theater.

Dennis' school is putting on a play about all nations. Each student has to ask someone to represent a different nationality to be in the play. Dennis asks Mr Wilson and Mr. MacTavish to represent Scotland. The 1961 Miss Scotland appears.

Dennis, Tommy, and Stewart start a clubhouse in Mr. Wilson's crawl-space. After a fortuneteller tells Mr. Wilson that he will hear from one of his late relatives, he hears noises in the house and thinks a late relative has come back from the dead, but it's Dennis and his friends in the basement.

Dennis' school teacher stops by to tell the Mitchells that Dennis scored high on an IQ test at school. They try to help Dennis with his intelligence, and later find out there was a mistake in the grading.

Both Dennis and Mr. Wilson are ashamed that they have never learned to whistle, and try everything they can think of, including eating very sour cherries, to be able to do so.

In a case of mistaken property, Dennis takes Mr Wilson's lawn edger to give his father. When Mr Wilson finds his edger is missing, he takes one from Mrs Elkins.

After Joey has to go home Dennis has no one to play with Henry is going golfing, Mr. Wilson is going bowling, Alice has a date to play bridge and his other friends aren't around So, Dennis decides he wants to go visit his Grandfather which is far away so when he asks Alice to take him to his Grandfather's and she can't Dennis decides to start walking there but, he doesn't get far as he ends up getting stopped by the police.

Dennis thinks that his dad is in money trouble so he starts out selling bottles and before you know it everyone in town thinks that the Mitchell's really are in trouble with money.

To help the bees find honey Dennis sprays a fragrant smell on Mr. Wilson's camellias, Mr. Wilson of course gets carried away thinking he has developed a rare flower that will make him a fortune only to discover that the fragrant smell is from Dennis spraying perfume on his flowers.

Dennis wants a bike so bad that he will do almost anything to get one such as taking one away from another child, Trying to win one in a bean contest, riding Mr. Wilson's exercise bike. Finally in the end Henry takes Dennis shopping for a bike.

A fellow-garden-club member asks George to take a picture of a special delicate plant that only blooms at night. George is ready with his camera, but falls asleep before the flower blooms. Dennis asks Mr Wilson to be the Scout Den Mother.