Season 3 Plot Summaries Go to Episode List for original air dates
1) "Trouble from Mars." Mr. Wilson accidentally gets Dennis' space helmet stuck on his head.
2) "Best Neighbor." Dennis and Mr. Wilson camp out on a mountain so that Dennis can join the Junior Pathfinders club.
3) "Keep Off the Grass." 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.
4) "Mr. Wilson's Safe." Mr. Wilson has something very important in his safe. Unfortunately, no one can remember the combination.
5) "Haunted House." George and Henry purchase a house as an income property and later find out that it is known to be haunted.
6) "The School Play." Mr. Wilson ends up being in a play at Dennis' school after he and Tommy get handcuffed together before the play starts.
7) "The Fifty-Thousandth Customer." Mr. Finch is having a contest in which his store's fifty-thousandth customer of the year will win five minutes of free shopping. Mr. Wilson is determined to be the winner.
8) "Dennis and the Pee Wee League." Mr. Wilson coaches Dennis' Pee Wee League baseball team because Henry, the team's original coach, becomes ill.
9) "Mr. Wilson's Inheritance." Mr. Wilson receives an inheritance from his aunt and thinks about starting a foundation to help the less fortunate.
10) "Dennis Is a Genius." A school intelligence test labels Dennis a genius.
11) "The Lucky Piece." Dennis mows Mr. Wilson's lawn, and instead of the silver dollar he's promised, Mr. Wilson tricks him into taking a silver coin with a horseshoe and the words "Good Luck" written on it.
12) "The Fifteen-Foot Christmas Tree." Dennis, Henry and Mr. Wilson go out in the woods and cut down a big Christmas tree that almost ends up getting destroyed before they get it home.
13) "Dennis' Bank Account." Dennis wants to open an account at the bank where Mr. Wilson is temporarily working in the new-accounts department.
14) "Through Thick and Thin." Dennis' Cub Scout troop is putting on a circus, and Dennis convinces Mr. Wilson to be the lion.
15) "Calling All Bird Lovers." Mr. Wilson holds a bird lovers' session at his home that includes a woman who does realistic bird calls.
16) "Silence Is Golden." Mr. Wilson agrees to give Dennis his magnifying glass as long as he doesn't say a word to him or around him for the rest of the day.
17) "Dennis Has a Fling." Dennis is put on the spot when he asks both Mr. Wilson and Mr. MacTavish to represent Scotland for his school project.
18) "Frog Jumping Contest." Dennis enters his frog in a jumping contest with Mr. Wilson as his partner. Mr. Wilson bets Sergeant Mooney that Dennis' frog will win.
19) "Where There's a Will." Mr. Wilson decides to leave Dennis a gold watch in his will. Soon after, Mr. Wilson begins to feel old and is convinced that he has only a short time to live.
20) "Mr. Wilson's Uncle." George's Uncle Ned comes to visit and convinces George that he isn't in shape. Ned starts a physical fitness program and forces George and Henry to participate.
21) "A Quiet Evening." Mr. Wilson plans to have a quiet evening at home, but his plans change when Henry needs a sitter for Dennis.
22) "The Private Eye." Mr. Wilson's wallet is taken by a pickpocket, so Dennis and Tommy try to help the police find the crook.
23) "Mr. Wilson's Housekeeper." Mr. Wilson hires a housekeeper for Mrs. Wilson but soon regrets it when the housekeeper tries to tell Mr. Wilson what he can and cannot do in his own home.
24) "A Dog's Life." A big shaggy dog follows Mr. Wilson home from the market.
25) "Dennis' Documentary Film." Dennis enlists the help of Mr. Wilson in creating a documentary film of the town for a school project.
26) "Horseless Carriage Club." Dennis charges admission to his friends for rides in Mr. Wilson's 1912 Winton.
27) "Junior Pathfinders Ride Again." An Indian fire-starting demonstration is scheduled for Dennis' Junior Pathfinders club, and Mr. Wilson is drafted to start a fire by rubbing together two sticks.
28) "The Treasure Chest." Mr. Wilson buys a treasure chest at auction thinking that it has pirate treasure in it.
29) "Wilson Goes to the Dentist." Dennis has an appointment to go to a new dentist in town who gives a gift to each child that sees him for the first time.
30) "The Man Next Door." Mr. Wilson thinks his next-door neighbor is the stocking bandit and he tries to prove it. (note: this is the last episode that Joseph Kearns appeared in)
31) "Dennis and the Dodger." The mayor agrees to give the team new uniforms if Mr. Quigley can get Sandy Koufax and the Dodgers to play an exhibition game in town.
32) "Dennis' Lovesick Friend." In order to get out of playing house with Margaret, Dennis decides to help Mr. Wilson's Uncle Ned plant flower bulbs in his yard.
33) "John Wilson's Cushion." George Wilson's brother John comes to stay with Martha while George is out of town.
34) "John Wilson Wins a Chicken." After selling a rare 1919 dime for $150, Mr. Wilson buys ten raffle tickets from Dennis and ends up winning a chicken. When he wants to cook the chicken for dinner, Dennis and his friends try to talk him out of it.
35) "The Bully." Alice makes Dennis promise not to fight after he is picked on by the school bully.
36) "The Club Initiation." Dennis wants to join an older boys club, but in order to do so he has to go through an initiation.
37) "Community Picnic." Mr. Brady and Tiny, an employee at his store, challenge Henry and John to compete against them in the sporting events at an upcoming community picnic. (Sylvia Field's last appearance in the series.)
38) "Dennis and the Witch Doctor." Mr. Wilson is writing a magazine article about voodoo. Dennis gets the wrong idea and tells the whole neighborhood that Mr. Wilson is a witch doctor.
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