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38 Episodes 1961 - 1962
Episode 1
Sun, Oct 1, 196125 mins
Mr Wilson goes for a haircut in preparation for a magazine taking his picture for an article. Unfortunately, Dennis scares the barber and the back of George's hair is accidentally shaved off.
Episode 2
Sun, Oct 8, 196130 mins
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.
Episode 3
Sun, Oct 15, 196130 mins
A new regulation says no one can walk on the grass in the park. When a policeman chases Dennis and his friends off the grass, Henry talks to the policeman. Henry gets a ticket for walking on the grass in order to talk to the policeman.
Episode 4
Sun, Oct 22, 196130 mins
Thanks to Dennis, Mr. Wilson forgets the combination to his new safe.
Episode 5
Sun, Oct 29, 196130 mins
George and Henry buy an investment property only to find out it's haunted.
Episode 6
Sun, Nov 5, 196130 mins
Chaos ensues when Dennis handcuffs Mr. Wilson to Tommy while rehearsing a school play and there's no key.
Episode 7
Sun, Nov 12, 196130 mins
With Mr. Finch offering a free 5-minute shopping spree for the 50,000th customer at his pharmacy, Mr. Wilson tries to calculate the exact moment that it will happen so that he can walk through the door and claim the prize.
Episode 8
Sun, Nov 19, 196130 mins
When Henry becomes sick, Mr. Wilson manages Dennis' Pee Wee League baseball team.
Episode 9
Sun, Nov 26, 196130 mins
Mr. Wilson believes he's a millionaire when he inherits his aunt's estate.
Episode 10
Sun, Dec 3, 196130 mins
School teacher Miss Perkins tells the Mitchells that Dennis scored so high on an IQ test, he is a genius. When the words gets out, all of his friends from Margaret to Seymour want nothing to do with him. And Mr. Wilson is in shock.
Episode 11
Sun, Dec 17, 196130 mins
Mr Wilson gives Dennis a coin with Good Luck written on it for mowing his lawn. Dennis thinks it is a lucky coin, and he seems to have a lot of good things happening to him.
Episode 12
Sun, Dec 24, 196130 mins
Dennis, Henry, and Mr. Wilson go out in search of the perfect Christmas tree to chop down. As problems arise, their quest turns into quite an odyssey.
Episode 13
Sun, Dec 31, 196130 mins
After Mr. Wilson takes a temporary position at the bank, Dennis opens up a bank account and stops at the bank daily to check on his money and keep Mr. Wilson company.
Episode 14
Sun, Jan 7, 196230 mins
The Mitchell's host a circus act for a cub scout event. They need someone in the back end of a lion costume. He asks Mr Wilson to help out.
Episode 15
Sun, Jan 14, 196230 mins
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.
Episode 16
Sun, Jan 21, 196230 mins
Mr. Wilson wagers his large magnifying glass, betting that Dennis can't refrain from talking to him for five straight hours.
Episode 17
Sun, Jan 28, 196230 mins
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.
Episode 18
Sun, Feb 4, 196230 mins
With Mr. Wilson's help, Dennis enters his frog in a frog jumping contest.
Episode 19
Sun, Feb 11, 196230 mins
Mr. Wilson has a memorable birthday after he decides to leave Dennis his gold watch in his will.
Episode 20
Sun, Feb 18, 196230 mins
George is expecting a visit from his Uncle Ned, a rocker-chair addict. When Ned arrives, he is active, fit, and energetic. Ned forces George and Henry into a fitness program.
Episode 21
Sun, Feb 25, 196230 mins
Mr. Wilson's plans for a quiet evening with his coin collection go awry when he unexpectedly has to babysit Dennis, Margaret, and Seymour.

Episode 22
Sun, Mar 4, 196230 mins
Dennis gets a new Private Eye Detective Kit and has fun with Tommy solving crimes. When they hear that Mr Wilson's wallet was stolen, Dennis and Tommy use their new found skills to find the culprit.
Episode 23
Sun, Mar 11, 196230 mins
To help Martha, Mr. Wilson hires a housekeeper. But this backfires when the stern housekeeper won't let Mrs. Wilson do anything, and rearranges the kitchen cabinets to Mr. Wilson's dissatisfaction.
Episode 24
Sun, Mar 18, 196230 mins
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.
Episode 25
Sun, Mar 25, 196230 mins
Dennis has a history project for school to take pictures of historical places around town, and then write a composition about them. Mrs Wilson suggests Mr Wilson help Dennis because he has a movie camera.
Episode 26
Sun, Apr 1, 196230 mins
Henry buys an antique car to enter the Horseless Carriage Road Race. He hopes the win the prize and become the president of his and Henry's local chapter for the club. Dennis talks Mr Wilson to take him & his friends on a drive in the car.
Episode 27
Sun, Apr 8, 196230 mins
George hopes to become a member of the Pioneer Club in order to get a free cabin vacation each year. He agrees to help Dennis' Junior Pathfinders Club build a fire with just two sticks in order to assure his membership in the Pioneers.
Episode 28
Sun, Apr 15, 196230 mins
Dennis gets an old chest from Mr Wilson who thinks the chest has nothing of value. Dennis & Tommy play pirates with the items in the chest, and even draw up a map to a pretend treasure. Mr Wilson later finds it and thinks it is real.
Episode 29
Sun, Apr 29, 196230 mins
Dennis, with a loose tooth, wants to visit a new dentist who gives presents to first-time patients. But when Dennis's tooth falls out before he can go to the dentist, he convinces Mr. Wilson to go in his place so Dennis can still get a present.
Episode 30
Sun, May 6, 196230 mins
Mr Wilson installs his own burglar alarm after a series of burglaries in the neighborhood. Dennis thinks the new neighbor is the stocking bandit. This is the last episode with Joseph Kearns who died after filming the episode.
Episode 31
Sun, May 13, 196230 mins
Dennis & Tommy get Mr Quigley to coach their baseball team. Mr Quigley hopes it improves store sales. He manages to get the Dodgers to play an exhibition game for the town. Mr Wilson is said to be going on a trip which explains his absence.
Episode 32
Sun, May 20, 196230 mins
George's Uncle Ned visits while George is out of town. He decides to plant flowers to win a flower contest in the summer. Dennis says he will help plant the flower bulbs so he does not have to play with Margaret.
Episode 33
Sun, May 27, 196230 mins
While Mr. Wilson is out-of-town, his brother, John, moves in with Mrs. Wilson.
Episode 34
Sun, Jun 3, 196230 mins
Dennis' school is raffling off live chickens, and Dennis gets John Wilson to buy tickets. He wins and wants to cook the chicken but Dennis won't allow it.
Episode 35
Sun, Jun 10, 196230 mins
A bully at school beats up Dennis. John Wilson helps him to learn to fight.
Episode 36
Sun, Jun 17, 196230 mins
When Dennis sets out to join a club, John Wilson begins to question his sanity.
Episode 37
Sun, Jun 24, 196230 mins
John Wilson and Henry Mitchell compete in the games at the community picnic.
Episode 38
Sun, Jul 1, 196230 mins
John Wilson is writing an article about witch doctors. But some strange occurrences and odd accidents convince his new neighbors that he really is a witch doctor and is out to hex them.