Mr. Finch is having a contest that when the fifty-thousandth customer walks in his store they will win 5 minutes of free shopping of which Mr. Wilson is determined to be the one who wins.

Dennis is determined to get a horse for Christmas, So on Christmas day he goes around the neighborhood trying to find what he thinks is his horse.

Mr. Wilson accidentlly gets a space helmet that belongs to Dennis stuck on his head.

Mr. Wilson holds a bird lovers session at his home Where a woman does bird calls that sounds just like a bird.

Dennis convinces Mr. Wilson to run for park commissioner because the playgroung is closed except on weekends.

Mr. Wilson takes Dennis and his friends to a camp to visit for a day and end up getting stranded there for a week because a bridge went out due to a storm.

Dennis overhears Mr. Wilson saying that he wishes he had his racoon coat back, so he gives the story to the newspaper and so all day people are bringing Mr. Wilson racoon coats.

Mr. Wilson wants to represent Scotland for Dennis' School

Mr. Wilson tricks Dennis into taking a silver coin that says GOOD LUCK and a horseshoe on it instead of 50 cents that he owes him for cutting his lawn. Mrs. Wilson is very angry with him about it. So, she and Alice start a scheme of their own by making lucky things happen to Dennis all day. Mr. Wilson soon starts to believe that the coin was lucky after all and is sorry he ever let it go. He then realizes that it was all a charade to teach him a lesson.

Dennis, Henry and Mr. Wilson go out in the woods and cut down a big Christmas tree which ends up getting almost destroyed by the time they get it home.

Mr. Wilson thinks his next door neighbor is the stocking bandit and tries to prove it.

Dennis replaces a fallen signpost... backwards.

Dennis writes a composition for school on his best friend and he chooses Mr. Wilson to write about.

Dennis accidently steps on one of Mr. Wilson's plants and so he buys him a replacement and plants it in Mr. Wilson's flower bed. When Mr. Wilson sees it, he is convinced that his new miracle plant food that he invented works like a miracle.

Henry gets a ticket for walking on the grass in the park. When Mr. Wilson hears about it he thinks it isn't fair, So he convinces Henry to go to court and contest it.

Mr. Wilson gives Dennis a Gold watch in his will. Soon after that Mr. Wilson begins to feel old and is convinced that he has short time to live.

Dennis gets an electric car for his mom from the lady who won the Raffle.

Dennis attempts to find Miss. Cathcart a best friend, so he gets her a dog from the pound. However the dog's owner is looking for him and ends up showing up at Miss. Cathcart's house before Dennis brings the dog over to Miss. Cathcart. So she mistakenly thinks that the guy is the friend instead of the dog.

Miss Cathcart's cat is accidentally locked in the trunk of Mr. Wilson's car.

Mr. Wilson has a hundred doller bill which he drops and a crow picks it up and flies away with it. He later finds it in an old tree in a park which the park commissioner is going to cut down, So Mr. Wilson climbs the tree to get his hundred doller bill and to also save the tree from being cut down.

Mr. Wilson builds a barbecue in his backyard with help from Dennis' friend, Fred Bains.

Dennis enters a soapbox derby and Mr. Wilson accidently ends up being the one driving it in the race.

Mr. Wilson is supposed to take a picture of a plant that bloomes at night but ends up dozing off when it bloomes, So Dennis takes the picture of the plant for him.

Dennis' school is putting on a play which Mr. Wilson ends up being in (not by choice) because him and Tommy (who is also in the play) get handcuffed together before the play starts.

Mr. Wilson takes Dennis and his friends up to the lake and back in an old car. Mr. Wilson then gets elected president of the Horseless Carriage Club.