Mr. Wilson accidentlly gets a space helmet that belongs to Dennis stuck on his head.
Guest Stars:
Forrest Lewis, Norman Leavitt, Lyle Latell, Bob Hastings
Dennis and Mr. Wilson camp out on a moutain so that Dennis can join the Junior Pathfinders club.
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.
Guest Stars:
Alma Platt
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.
Guest Stars:
Will Wright
Mr. Wilson and Henry both invest in a house that is known to be a haunted house.
Guest Stars:
Harold Gould, George Cisar, Harvey Korman, Kitty Kelly
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.
Guest Stars:
George Cisar, Chubby Johnson, Dick Cherney
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.
Guest Stars:
Charles Lane, Irene Tedrow
Mr. Wilson coaches Dennis' Pee Wee League baseball team because Dennis' dad (who originally was the coach) got sick.
Guest Stars:
Chubby Johnson, Dick Cherney, Charles Seel
Mr. Wilson wants to represent Scotland for Dennis' School
Guest Stars:
Gordon Jones, Lennie Weinrib, Irene Tedrow, Harry Ellerbe
The school test scores mistake Dennis as a genius.
Guest Stars:
Elizabeth Harrower
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.
Guest Stars:
Henry Beckman
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.
Guest Stars:
Willard Waterman, Fiona Hale
Dennis opens a bank account at the bank of where Mr. Wilson works at and causes a lot of chaos at the bank.
Guest Stars:
John Fiedler, Lauren Gilbert
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.
Guest Stars:
Hal Bokar, Charles Seel
Mr. Wilson holds a bird lovers session at his home Where a woman does bird calls that sounds just like a bird.
Guest Stars:
Joe Conley, Estelle Winwood, Parley Baer
Mr. Wilson agrees to give Dennis his magnifying glass if he doesn't talk around him for the day.
Guest Stars:
Irene Tedrow
Dennis is put on the spot when he askes both Mr. Wilson and Mr. Mactavish to represent Scotland in his school project.
Guest Stars:
Elizabeth Harrower, Tudor Owen, Charles Seel, Emory Parnell
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.
Guest Stars:
George Cisar, Alan Hewitt, Eddie Marr
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.
Guest Stars:
Hardie Albright, Ray Teal
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.
Guest Stars:
Edward Everett Horton
Mr. Wilson plans to have a quiet evening at home, but his plans change when Henry needs a sitter for Dennis.
Guest Stars:
Kirk Alyn, John Astin
Mr. Wilson gets his wallet taken by a pick pocket, So Dennis and Tommy try to find the crook for the police.
Guest Stars:
Emile Meyer, William Benedict, Bob Hastings
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.
Guest Stars:
Jean Stapleton
A big shaggy dog followes Mr. Wilson home and Mr. Wilson tries to get rid of it.
Guest Stars:
Willard Waterman, Irene Tedrow, Charles Seel, Bob Hastings, Ivan Bonar
Dennis does a documentary film of the town for a school project with Mr. Wilson's help.
Guest Stars:
George Cisar
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.
Mr. Wilson attempts to start a fire like the pioneers did for Dennis' Junior Pathfinders club and nearly burns down the place.
Guest Stars:
Lloyd Corrigan
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.
Guest Stars:
Edward Everett Horton, George Cisar, Chubby Johnson, George Ford
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.
Guest Stars:
Arthur Malet
Mr. Wilson thinks his next door neighbor is the stocking bandit and tries to prove it.
Guest Stars:
George Cisar
Mr. Quigley coaches Dennis' baseball team with help from Sandy Koufax.
Guest Stars:
Sandy Koufax, Willard Waterman, Lyle Talbot, Florence MacMichael, George DeNormand
Dennis helps Mr. Wilson's Uncle Ned plant flower bulbs in his yard in order to get out of playing house with Margaret Wade.
Guest Stars:
Lucille Wall, Edward Everett Horton, Cheryl Holdridge
George Wilson's brother John Wilson comes to visit, only he has trouble working without his old cushion.
Guest Stars:
Elvia Allman, Willard Waterman
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.
Guest Stars:
Irene Tedrow, George Cisar
Dennis is all set for a big day. He is scheduled to have a fight with Gifford - the school bully.
Guest Stars:
Richard Reeves
Dennis wants to join an older boys club, but in order to do so he has to take an initiation.
Guest Stars:
Molly Dodd, Frank Cady, Billy E. Hughes
The Neighborhood Community puts on a carnival in the park with different winning contests to participate in.
Guest Stars:
Willard Waterman, Charles Lane
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.
Guest Stars:
Jeannie Russell, Irene Tedrow, Billy Booth, George Cisar