1x2 - Iyami's Fishing Pond / The 40 Thieves

February 12, 1966

Iyami attempts to con Osomatsu, Choromatsu, and Chibita out of their hard-earned money at his fishing pond with a rare fish that gives them all their money back if caught. Later, Chibita plays the role of the leader of a gang of thieves who targets Osomatsu for discovering their misdeeds.

1x3 - Chibita's Stray Cat Strategy / A Thief Fell From The Sky

February 19, 1966

Totoko's grandpa enlists the help of the sextuplets to stop Chibita and his gang of feral cats from attacking the fish store. Later, Iyami and Chibita fly around town in a helicopter to cause mischief amongst the locals.

1x4 - The Helpful Robot / Iyami's Cleaning Store

February 26, 1966

A housework robot (shaped like Chibita) causes havoc amongst the Matsuno family when he malfunctions. Meanwhile, Iyami runs a scam out of a laundromat to catastrophic failure.

1x5 - There's the Shortcut / Laughing Costs 1 Billion Yen!

March 5, 1966

Iyami and Chibita feign construction workers to scam the sextuplets out the their money by making a paid shortcut to school. Later, a camera company offers a cash prize for whoever can photograph a face-making man without any made faces, leading the sextuplets and Chibita to try to claim the reward.

1x6 - Osomatsu Targeted / Chibita's Martial Arts

March 12, 1966

Spooky things seem to be happening around town, leading the sextuplets to discover a secret of their own appearance. Meanwhile, Chibita challenges the brothers to a martial arts battle.

1x7 - The Magical Tea Kettle / The Angry Superman

March 19, 1966

Iyami scams the sextuplets with a magic kettle, actually utilizing Chibita as the secret inside. Later, Chibita and Bokeo get revenge on the sextuplets for harming their frog friend.

1x8 - It's All Fine Until You Take Off His Hat / Boar Hunting

March 26, 1966

Chibita appears alongside Totoko wearing a strange hat that when removed, changes his temperament from good to bad, leading to chaos amongst the Matsunos. Meanwhile, Chibita goes boar hunting and encounters the sextuplets and Iyami.

1x9 - Iyami the Dentist / Defeat the Mosquitoes' Enemies!

April 2, 1966

Osomatsu visits dentist Iyami's office for a toothache, but due to an unpaid bill, assists him in fixing up the mouth of Dekapan's crocodilian "son". Later, after Chibita's mosquito colony is destroyed by the sextuplets, he and Iyami create a watermelon-shaped bomb to enact revenge.

1x10 - I am Chibita, The Giant! / Counterattack Operation Pepen

April 9, 1966

Chibita, with the help of his scientist uncle, devise a plan to shrink the sextuplets down to flea size so that he will no longer be shorter than them. Meanwhile, a roaming minstrel and Chibita team up to enact revenge on the sextuplets with their army of cats.

1x11 - Osomatsu-kun Gets Adopted / Chibita the Invisible Man

April 16, 1966

A wealthy couple pay the sextuplets' parents to loan one of their boys out to them as a paid son, but the love they have for Osomatsu and Choromatsu is much too young for them. Meanwhile, Chibita drinks an invisibility potion and causes mischief.

1x12 - The Cutie Who Moved Close By / Rampage of the Smog Family

April 23, 1966

A new girl moves into the neighborhood, and the sextuplets try to put the moves on her while confusing her dad for their eerily-resembling dog. Later, a crime family that Chibita is a part of has business with the sextuplets, climaxing in a rainy nighttime brawl.

1x13 - The Opposite-Head Experiment / Iyami the Designer

April 30, 1966

An apple-headed doctor conducts an experiment on the sextuplets, but his seemingly strange mood swings are more than meets the eye. Meanwhile, Iyami works as a bespoke clothing designer for the Matsunos, but suspicions are aroused when the family's Children's Day koinobori goes missing.

1x14 - Iyami's Ninja Methods / Keke, I'm the Class President!

May 7, 1966

Ninjutsu master Iyami insists the help of his disciples Chibita and Moguramaru to get revenge on the sextuplets. Later, Chibita attempts to thwart Totoko's run as Class President.

1x15 - Chibita, Did You Turn Into a Dog? / The Suspicious Transfer Student

May 14, 1966

Chibita takes the place of Dekapan's trained dog "son" when circus ringmaster Iyami buys him for his circus. Later, a student with a padlocked hat transfers to the sextuplets' school, leading to a mystery of his identity.

1x16 - The Time Machine Sends Us to the Stone Age / The Junk Strategy

May 21, 1966

The Matsunos take a trip in a wacky inventor's time machine to the age of the dinosaurs, where they meet their friends' prehistoric counterparts. Meanwhile, neighbors Iyami and Chibita go to war with the Matsunos over trash disposal.

1x17 - Chika-chan and Chibita / Don't Wake The Sleeping Child

May 28, 1966

Chibita falls in love with snooty Chikako, but the sextuplets' faulty attempts at woo cause more than trouble for the little lovebirds. Meanwhile, the sextuplets watch over a sleepwalking boy who becomes violent when awoken.

1x18 - Suspicious Presents / See Doctor Chibita For Tooth Decay

June 4, 1966

A Santa Claus-like figure arrives in the town, in actuality a persona put on by burglar Moguramaru to hide stolen goods. Later, deranged dentist Chibita enacts periodontal violence against people with better teeth than him.

1x19 - Where's Chibita Going? / Chibita's Girlfriend

June 11, 1966

The sextuplets become victims of a vindictive clothesless Chibita, who tries to steal their clean clothes. Meanwhile, the Matsunos offer Dekapan a place for his pig "daughter" to stay, but Chibita falls in love with her without knowing she isn't human.

1x20 - Iyami the Rude Guest / Chibita the Sailor

June 18, 1966

The sextuplets' father invites work friend Iyami over for dinner, but chaos ensues in response to his disruptive behavior. Later, Chibita attempts to sneak onto an ocean liner under the guise of a sailor.

1x21 - Iyami in France / Dad Ran Away

June 25, 1966

Iyami runs a "genuine" French restaurant with Chibita, and receives criticism for his poor service and lack of research. Meanwhile, Mr. Matsuno resigns from his position as patriarch, and runs away.

1x22 - Episode 22

July 2, 1966

1x23 - Episode 23

July 9, 1966

1x24 - Episode 24

July 16, 1966

1x25 - Episode 25

July 23, 1966

1x26 - Episode 26

July 30, 1966

1x27 - Episode 27

August 6, 1966

1x28 - Episode 28

August 13, 1966

1x29 - Episode 29

August 20, 1966

1x30 - Episode 30

August 27, 1966

1x31 - Episode 31

September 3, 1966

1x32 - Episode 32

September 10, 1966

1x33 - Episode 33

September 17, 1966

1x34 - Episode 34

September 24, 1966

1x35 - Episode 35

October 1, 1966

1x36 - Episode 36

October 8, 1966

1x37 - Episode 37

October 15, 1966

1x38 - Episode 38

October 22, 1966

1x39 - Episode 39

October 29, 1966

1x40 - Episode 40

November 5, 1966

1x41 - Episode 41

November 12, 1966

1x42 - Episode 42

November 19, 1966

1x43 - Episode 43

November 26, 1966

1x44 - Episode 44

December 3, 1966

1x45 - Episode 45

December 10, 1966

1x46 - Episode 46

December 17, 1966

1x47 - Episode 47

December 24, 1966

1x48 - Episode 48

December 31, 1966

1x49 - Episode 49

January 7, 1967

1x50 - Episode 50

January 14, 1967

1x51 - Episode 51

January 21, 1967