Dennis' School has a contest that any student who collects the most stamps wins a trip to Cape Canaveral and meet an Astronaut. Unfortunately, Dennis comes down with the chicken pox right when he is about to win.

Dennis and his friends help a boy who is poor and feels that he doesn't fit in prepare for and play in the school basketball game.

Mr. Wilson enters a contest that requires having children, so he passes Dennis and his friends off as his kids.

Dennis does a documentary film of the town for a school project with Mr. Wilson's help.

Dennis eludes a babysitter to go to the movies that his parents are at.

Dennis replaces a fallen signpost... backwards.

Henry and Mr.Wilson try to go fishing without Dennis.

Dennis tries to fix his Grampa Perkins up with Miss Cathcart.

Mr. Wilson thinks he has discovered a space satellite.

Mr. Wilson's garden originally consisted of Dahlia bulbs. When Dennis sees them, he thinks they are ""sweet potatoes"" and after his bedtime, he ""secretly exchanges"" what is in his garden with what is in Mr. Wilson's garden. Dennis eventually raises the Dahlia bulbs & wins a 1st prize medal. After the garden judges see Mr. Wilson's garden, he is also given a medal.

Dennis helps Mr Wilson sell a neighbors house.

Dennis and Tommy camp out in the back yard. Dennis' parents friends The Melton's play a record containing wild animal sounds to entertain the boys while they are camping out in the yard. Mr. Wilson can hear the record from his house and is convinced that wild animals have escaped from the circus and are after the boys so Mr. Wilson goes out to the yard to try and save Dennis and Tommy from danger.

Dennis thinks his dad is broke so he sells bottles to try and help his dad out. However, when Dennis tells some of the neighbors what he is doing the neighbors get the wrong idea about the Mitchell's and think that they are in trouble financially.

Dennis starts a rumor that him and his family are moving to New York only to keep Mr. Wilson in town to get his award.

Dennis is going crazy trying to find his gifts.

Dennis meets Whip Crawford his cowboy idol after Mrs Webster tells Dennis he will be in the play.

Dennis Haunts Mr. Wilson's house due to him and his friends starting a club house in Mr. Wilson's basement.

Mr. Wilson attempts to teach Dennis about bird watching, then Dennis takes care of a sick bird

George Wilson is looking for a rare coin. But George is in for a sad shock $250.00 (that's what he paid for the coin) But the coin is fake!

To get a bike Dennis sells a fishbowl of beans which he has to count before 5pm!

The Mitchell's are having a party and the guests are late, So Dennis tries to help people find the house by taking an open House for Free!

Dennis's duck (George) causes problems for Mr. Willson who is running for The Garden Club. He tries to get the duck to the lake.

Henry tries to take Alice out on their Anniversary. Meanwhile Dennis tries to build a swing in his yard and ends up chasing a cat up a tree in the process.

Dennis cares for a dog named Charlie who wins a prize for his painting!

Dennis meets Helen and wants to be pirate.