S4 E1 • Johnny's New Baby Sisters

Susan and Mary purposely turn themselves into babies while the parents are out, and Johnny has to keep them safe from the irresponsible babysitter Gil; this interferes with a party he and Dukey had been planning.

Première diffusion : 10 septembre 2009

S4 E2 • Trans-Johnny

Johnny tricks his sisters into letting him have teleporting powers. Susan and Mary mess with the powers to get revenge. Later the twins accidentally get them caught in a middle of an art robbery.

Première diffusion : 10 septembre 2009

S4 E3 • Une bonne action à tout prix

After Johnny lands his bike into a garbage truck, he becomes a Lady Bird Scout and tries to sell 1,000 boxes of cookies to get a new one. Little does he know, Sissy wants the bike as well, but for a better reason.

Première diffusion : 17 septembre 2009

S4 E4 • Johnny des cavernes

Johnny goes back in time in order to get a sloth bone for the twins, but when he returns he becomes a caveman, interfering with his grounding from selling Hugh's personal items.

Première diffusion : 17 septembre 2009

S4 E5 • Johnny le fugitif

Johnny and Dukey run away when Johnny's parents say he's old enough to do chores but not old enough to watch PG-13 movies.

Première diffusion : 24 septembre 2009

S4 E6 • Johnny on the Spot

Johnny steals a portable black hole, which later creates an early apocalypse.

Première diffusion : 24 septembre 2009

S4 E7 • Dark Johnny

Johnny joins forces with Dark Vegan to get him back to his home planet.

Première diffusion : 1 octobre 2009

S4 E8 • Pas de devoirs pour Johnny

Susan and Mary build Johnny a robot in order to help him do his homework, but the robot ends up stealing things for Johnny.

Première diffusion : 1 octobre 2009

S4 E9 • Papa Johnny

Susan and Mary switch Johnny and Hugh's brains after the two make a bet that involves taking on each other's lives.

Première diffusion : 8 octobre 2009

S4 E10 • Concours canin

Johnny and Dukey try to get in a dog show which only allows perfectly groomed and trained dogs.

Première diffusion : 8 octobre 2009

S4 E11 • Dukey Jekyll and Johnny Hyde

Dukey drinks a liquid which makes him turn into a monster. To make matters worse, a dog catcher (and later Mr. Black and Mr. White) are after him.

Première diffusion : 15 octobre 2009

S4 E12 • Johnny's Trophy Case

Johnny wants to get a trophy to put in his trophy case. Susan and Mary get obsessed with winning, so the three of them enter The Pork Belly River Jumpoff to win 1 million dollars and a trophy.

Première diffusion : 15 octobre 2009

S4 E13 • La fabuleuse fabrique de biscuits

Ayant une envie irrésistible de manger un biscuit, Johnny essaie un des "biscuits de fortune...

Première diffusion : 26 novembre 2009

S4 E14 • Les soeurs débiles de Johnny

The twins' latest invention accidentally makes them dumb thanks to Johnny right before their scholarship interview.

Première diffusion : 26 novembre 2009

S4 E15 • Johnny garde du corps

Johnny gets hired to stop Bling-bling from kissing Susan, but Johnny turns on the sisters once Bling-Bling bribes him.

Première diffusion : 3 décembre 2009

S4 E16 • Tom et Johnny

Susan et Mary transforment Johnny en souris pour tester le " coup de la souris dans le labyrinthe...

Première diffusion : 3 décembre 2009

S4 E17 • Agent secret Pré-ado

M. Black et M. White sont persuadés que Larious Nafarious s'apprête à conquérir le...

Première diffusion : 10 décembre 2009

S4 E18 • Johnny fait des bulles

Mr. Whacko invents a new helium gum that lifts kids into the sky, and Johnny must save them.

Première diffusion : 10 décembre 2009

S4 E19 • Johnny vieille école

Johnny travels to 1845 when school was easier, but he gets stuck there because the power supplier to the Turbo Time Tea house hasn't been invented yet. The sisters and Johnny try to find outdated technology to power the tea house.

Première diffusion : 7 janvier 2010

S4 E20 • Johnny Degrees Below Zero

Johnny creates a magnetic force field on the Earth which makes Porkbelly the new north pole.

Première diffusion : 7 janvier 2010

S4 E21 • Johnny Johnny

Johnny and Dukey get framed for stuff that Johnny and Dukey look alike robots (which Mr. Black and Mr. White made) do around Porkbelly.

Première diffusion : 4 février 2010

S4 E22 • Les coupons de Johnny

Johnny keeps attempting to ride down Suicide hill, but Susan and Mary keep redeeming Johnny's coupons.

Première diffusion : 4 février 2010

S4 E23 • Johnny rayon-X

Johnny gets X-Ray goggles.

Première diffusion : 25 février 2010

S4 E24 • La destruction de Johnny X

Johnny and Dukey decide to remain in super hero mode permanently but find being a superhero is harder than they think.

Première diffusion : 25 février 2010

S4 E25 • iJohnny

The twins upgrade Johnny's new cell phone. Later the phone becomes too intelligent and begins hacking government space missiles.

Première diffusion : 2 mars 2010

S4 E26 • Johnny vs. The Mummy

Johnny goes on a trip to the museum and brings the things to life, including a mummy.

Première diffusion : 2 mars 2010

S4 E27 • Le monstre de Johnny

Johnny's mail order foam monster becomes a real monster once the twins swap the water with their bottle of "side effects".

Première diffusion : 10 mai 2010

S4 E28 • Who's Johnny?

When Sissy considers Johnny too gross to help her in a science project, he begs Susan and Mary to change his personality.

Première diffusion : 10 mai 2010

S4 E29 • Princess Johnny

Johnny poses as a princess in order to prevent a war. Meanwhile, Susan and Mary decide that they would like to act like normal girls.

Première diffusion : 24 mai 2010

S4 E30 • 99 Deeds of Johnny Test

After getting his 99th detention, Johnny learns he must perform 99 good deeds or he will be sent to military school.

Première diffusion : 24 mai 2010

S4 E31 • Johnny's Amazing Race

Johnny and Dukey challenge his sisters, their friends, and their enemies to a survival challenge in which the winning team gets hundreds of dollars in gift certificates.

Première diffusion : 12 juillet 2010

S4 E32 • Johnny Test en 3D

While the tests go on vacation, Johnny and Dukey try to get back into their hotel room and avoid the hotel manager that doesn't allow pets.

Première diffusion : 12 juillet 2010

S4 E33 • Devine qui vient dormir chez Johnny

Mr. Black moves in with the Tests after he embarrasses Mr. White at the dance contest auditions.

Première diffusion : 26 juillet 2010

S4 E34 • Un meilleur ami pour Johnny

Johnny's parents keep setting Johnny up with new friends. When those don't work out, Johnny reveals Dukey's intelligence. Later, Dukey spends more time helping Johnny's parents instead of playing with Johnny.

Première diffusion : 26 juillet 2010

S4 E35 • Johnny vs. Bling Bling IV

Johnny once again has to protect Susan from Bling Bling Boy who is determined to have her as his valentine.

Première diffusion : 9 août 2010

S4 E36 • Johnny's Big Sister Smackdown

Susan and Mary both want Gil to go on a date with them, so they put up a wrestling match using rough guts (Susan uses Johnny's while Mary uses a lion's), but it leads to destructive results.

Première diffusion : 9 août 2010

S4 E37 • Johnny s'en va-t-en mer

Johnny goes to the beach to surf, but there are no waves, so Susan and Mary build a wave making machine and special surfboard for him.

Première diffusion : 23 août 2010

S4 E38 • Johnny est un gentil glaçon

Johnny and Dukey try to help Brain Freezer get a girlfriend.

Première diffusion : 23 août 2010

S4 E39 • Le roi Johnny

Johnny becomes obsessed with domination after Susan and Mary bring his chess pieces to life.

Première diffusion : 6 septembre 2010

S4 E40 • Johnny animé

Johnny uses one of his sisters' inventions to bring two cartoon characters to the real world in order to scare Sissy out of the house, but the characters mistake Porkbelly for a zombie world and try to destroy it.

Première diffusion : 6 septembre 2010

S4 E41 • Les gâteaux de Johnny

It's Lila's birthday and the family spends the morning to make her birthday a success. Johnny struggles to make her breakfast, Hugh tries to figure out a good but inexpensive gift for her, and the twins keep trap Lila in her bedroom until Hugh and Johnny are ready.

Première diffusion : 20 septembre 2010

S4 E42 • Johnny Tube

Johnny wants to become a internet sensation.

Première diffusion : 20 septembre 2010

S4 E43 • Soirée pyjama chez Johnny

Johnny is dragged into Susan and Mary's plan to get Gil to be in a sleep-over, but Bling-Bling Boy and Dark Vegan's daughter Jillian become involved as well, with the usual chaos ensuing.

Première diffusion : 4 octobre 2010

S4 E44 • Johnny a une verrue

Johnny gets a wart, and when his sisters try to get rid of it, it gives the wart intelligence and seems to make Johnny's life better, but he tries to take over his body as he gets more powerful.

Première diffusion : 4 octobre 2010

S4 E45 • Johnny's Royal Flush

When Susan and Mary turns Johnny into a fish as part of one of their experiments, Hugh flushes him down the toilet by mistake where he ends up in the sewer, and he has to swim for his life when he runs into an alligator.

Première diffusion : 18 octobre 2010

S4 E46 • La folle journée de Johnny Test

Johnny ditches school with a relentless truant officer in hot pursuit.

Première diffusion : 18 octobre 2010

S4 E47 • Johnny & Dark Vegan's Battle Brawl Mania

Dark Vegan once again tries to destroy Johnny, who is trying to cheer up lonely Repto-Slicer.

Première diffusion : 1 novembre 2010

S4 E48 • A Scholarship for Johnny

Hugh wants to train Johnny to be good at sports so that he could get a sports scholarship to college.

Première diffusion : 1 novembre 2010

S4 E49 • Johnny le matelot

Johnny, his friends, and his enemies all compete in a boat race against an arrogant rowing team.

Première diffusion : 15 novembre 2010

S4 E50 • Johnny Lock Down

Johnny is determined to get a flytrap plant from his sisters for his school's science fair.

Première diffusion : 15 novembre 2010