S3E1 - Trouble from Mars
Mr. Wilson accidentlly gets a space helmet that belongs to Dennis stuck on his head.
Oct. 1, 1961, midnight
S3E2 - Best Neighbor
Dennis and Mr. Wilson camp out on a moutain so that Dennis can join the Junior Pathfinders club.
Oct. 8, 1961, midnight
S3E3 - 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.
Oct. 15, 1961, midnight
S3E4 - Mr. Wilson's Safe
Dennis is using numbers for a football play which is the combination to Mr. Wilson's safe, So Mr. Wilson and Henry get Dennis so confused that he forgets the combination. Then Mr. Wilson forgets it. Now they are in a real mess because Mr. Wilson has something very important locked in the safe. So Mr. Wilson tries everything including trying to hypnotize Dennis so he can remember the combination. He ends up hypnotizing himself and remembers the combination at last.
Oct. 22, 1961, midnight
S3E5 - Haunted House
Mr. Wilson and Henry both invest in a house that is known to be a haunted house.
Oct. 29, 1961, midnight
S3E6 - The School Play
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.
Nov. 5, 1961, midnight
S3E7 - The Fifty-Thousandth Customer
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.
Nov. 12, 1961, midnight
S3E8 - Dennis and the Pee Wee League
Mr. Wilson coaches Dennis' Pee Wee League baseball team because Dennis' dad (who originally was the coach) got sick.
Nov. 19, 1961, midnight
S3E9 - Mr. Wilson's Inheritance
Mr. Wilson wants to represent Scotland for Dennis' School
Nov. 26, 1961, midnight
S3E10 - Dennis Is a Genius
The school test scores mistake Dennis as a genius.
Dec. 3, 1961, midnight
S3E11 - The Lucky Piece
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.
Dec. 17, 1961, midnight
S3E12 - The Fifteen Foot Christmas Tree
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.
Dec. 24, 1961, midnight
S3E13 - Dennis' Bank Account
Dennis opens a bank account at the bank of where Mr. Wilson works at and causes a lot of chaos at the bank.
Dec. 31, 1961, midnight
S3E14 - Through Thick and Thin
Dennis' cub scouts are putting on a circus of which Mr. Wilson is the Lion in the circus, which is suppose to be a secret from everyone.
Jan. 7, 1962, midnight
S3E15 - Calling All Bird Lovers
Mr. Wilson holds a bird lovers session at his home Where a woman does bird calls that sounds just like a bird.
Jan. 14, 1962, midnight
S3E16 - Silence Is Golden
Mr. Wilson agrees to give Dennis his magnifying glass if he doesn't talk around him for the day.
Jan. 21, 1962, midnight
S3E17 - Dennis Has a Fling
Dennis is put on the spot when he askes both Mr. Wilson and Mr. Mactavish to represent Scotland in his school project.
Jan. 28, 1962, midnight
S3E18 - Frog Jumping Contest
Dennis enters his frog in the frog jumping contest with Mr. Wilson as his partner who has a bet with Sgt. Mooney that Dennis' frog will beat his.
Feb. 4, 1962, midnight
S3E19 - Where There's a Will
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.
Feb. 11, 1962, midnight
S3E20 - Mr. Wilson's Uncle
Mr. Wilson's Uncle comes to visit him and convinces him that he isn't in shape, so he starts a physical fitness program and forces Mr. Mitchell and Mr. Wilson to be in it.
Feb. 18, 1962, midnight
S3E21 - A Quiet Evening
Mr. Wilson plans to have a quiet evening at home, but his plans change when Henry needs a sitter for Dennis.
Feb. 25, 1962, midnight
S3E22 - The Private Eye
Mr. Wilson gets his wallet taken by a pick pocket, So Dennis and Tommy try to find the crook for the police.
March 4, 1962, midnight
S3E23 - 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 can't do in his home. Mr. Wilson then tries to get rid of her.
March 11, 1962, midnight
S3E24 - A Dog's Life
A big shaggy dog followes Mr. Wilson home and Mr. Wilson tries to get rid of it.
March 18, 1962, midnight
6.0
S3E25 - Dennis' Documentary Film
Dennis does a documentary film of the town for a school project with Mr. Wilson's help.
March 25, 1962, midnight
S3E26 - Horseless Carriage Club
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.
April 1, 1962, midnight
S3E27 - Junior Pathfinders Ride Again
Mr. Wilson attempts to start a fire like the pioneers did for Dennis' Junior Pathfinders club and nearly burns down the place.
April 8, 1962, midnight
S3E28 - The Treasure Chest
Mr. Wilson buys a treasure chest at an auction thinking that it has buried treasure in it. Mr. Wilson later discovers a treasure map drawn by Dennis. Although Mr. Wilson thinks the map is authentic so he plans to take a trip to the island and dig for the treasure.
April 15, 1962, midnight
S3E29 - Wilson Goes to the Dentist
Dennis convinces Mr. Wilson to go to the Dentist for his tooth because Dennis thinks he can get a basketball from the Dentist until he learns that the Dentist only gives away prizes to child patients.
April 29, 1962, midnight
S3E30 - The Man Next Door
Mr. Wilson thinks his next door neighbor is the stocking bandit and tries to prove it.
May 6, 1962, midnight
S3E31 - Dennis and the Dodger
Mr. Quigley coaches Dennis' baseball team with help from Sandy Koufax.
May 13, 1962, midnight
S3E32 - Dennis' Lovesick Friend
Dennis helps Mr. Wilson's Uncle Ned plant flower bulbs in his yard in order to get out of playing house with Margaret Wade.
May 20, 1962, midnight
S3E33 - John Wilson's Cushion
George Wilson's brother John Wilson comes to visit, only he has trouble working without his old cushion.
May 27, 1962, midnight
S3E34 - John Wilson Wins a Chicken
Dennis and his friends win John Wilson a chicken, which John wants to cook for dinner and the children try to talk him out of it.
June 3, 1962, midnight
S3E35 - The Bully
Dennis is all set for a big day. He is scheduled to have a fight with Gifford - the school bully.
June 10, 1962, midnight
S3E36 - The Club Initiation
Dennis wants to join an older boys club, but in order to do so he has to take an initiation.
June 17, 1962, midnight
S3E37 - Community Picnic
The Neighborhood Community puts on a carnival in the park with different winning contests to participate in.
June 24, 1962, midnight
S3E38 - Dennis and the Witch Doctor
Mr. Wilson is doing a magazine article on voodoo, Dennis gets the wrong idea and tells the whole neighborhood that Mr. Wilson is a Witch Doctor, Soon the whole town gets the wrong idea about Mr. Wilson.
July 1, 1962, midnight