Season 4

2009 · 52 episodes

Episodes

1Johnny's New Baby SistersSusan 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.
2Porta JohnnyJohnny 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.
3Join the Johnny ScoutsAfter 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.
4Johnny BCJohnny 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.
5Runaway JohnnyJohnny 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.
6Johnny on the SpotJohnny steals a portable black hole, which later creates an early apocalypse.
7Dark JohnnyJohnny joins forces with Dark Vegan to get him back to his home planet.
8No Homework for JohnnySusan and Mary build Johnny a robot in order to help him do his homework, but the robot ends up stealing things for Johnny.
9Papa JohnnySusan and Mary switch Johnny and Hugh's brains after the two make a bet that involves taking on each other's lives.
10The Johnnyminster Dog ShowJohnny and Dukey try to get in a dog show which only allows perfectly groomed and trained dogs.
11Dukey Jekyll and Johnny HydeDukey 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.
12Johnny's Trophy CaseJohnny 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.
13Johnny's Amazing Cookie CompanySusan and Mary make fortune cookies that come true, and Johnny sells them with the typical drastic results.
14Johnny's Big Dumb SistersThe twins' latest invention accidentally makes them dumb thanks to Johnny right before their scholarship interview.
15My Johnny GuardJohnny gets hired to stop Bling-bling from kissing Susan, but Johnny turns on the sisters once Bling-Bling bribes him.
16Tom and JohnnyJohnny turns into a mouse for Susan and Mary, but when Mr. Mittens comes, things get chaotic. This episode is a parody of Tom and Jerry.
17The Quantum of JohnnyJohnny tries to get invited to a party to stop a villain. NOTE: Susan and Mary don't appear in this episode.
18Johnny Get Yer GumMr. Whacko invents a new helium gum that lifts kids into the sky, and Johnny must save them.
19Old School JohnnyJohnny 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.
20Johnny Degrees Below ZeroJohnny creates a magnetic force field on the Earth which makes Porkbelly the new north pole.
21Johnny JohnnyJohnny and Dukey get framed for stuff that Johnny and Dukey look alike robots (which Mr. Black and Mr. White made) do around Porkbelly.
22Johnny Double CouponsJohnny keeps attempting to ride down Suicide hill, but Susan and Mary keep redeeming Johnny's coupons.
23X-Ray JohnnyJohnny gets X-Ray goggles.
24The Destruction of Johnny XJohnny and Dukey decide to remain in super hero mode permanently but find being a superhero is harder than they think.
25iJohnnyThe twins upgrade Johnny's new cell phone. Later the phone becomes too intelligent and begins hacking government space missiles.
26Johnny vs. The MummyJohnny goes on a trip to the museum and brings the things to life, including a mummy.
27Johnny Grow Your Own MonsterJohnny's mail order foam monster becomes a real monster once the twins swap the water with their bottle of "side effects".
28Who's JohnnyWhen Sissy considers Johnny too gross to help her in a science project, he begs Susan and Mary to change his personality.
29Princess JohnnyJohnny poses as a princess in order to prevent a war. Meanwhile, Susan and Mary decide that they would like to act like normal girls.
3099 Deeds of Johnny TestAfter getting his 99th detention, Johnny learns he must perform 99 good deeds or he will be sent to military school.
31Johnny's Amazing RaceJohnny 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.
32Johnny Test in 3DWhile 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.
33Guess Who's Coming to Johnny's for DinnerMr. Black moves in with the Tests after he embarrasses Mr. White at the dance contest auditions.
34Johnny's New BFFJohnny'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.
35Johnny vs. Bling Bling IVJohnny once again has to protect Susan from Bling Bling Boy who is determined to have her as his valentine.
36Johnny's Big Sister SmackdownSusan 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.
37Sunshine Malibu JohnnyJohnny 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.
38JohnnyicleJohnny and Dukey try to help Brain Freezer get a girlfriend.
39King JohnnyJohnny becomes obsessed with domination after Susan and Mary bring his chess pieces to life.
40Johnny Re-AnimatedJohnny 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.
41Johnny CakesIt'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.
42Johnny TubeJohnny wants to become a internet sensation.
43Sleepover at Johnny'sJohnny 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.
44Johnny's Got a Wart!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.
45Johnny's Royal FlushWhen 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.
46Johnny Test's Day OffJohnny ditches school with a relentless truant officer in hot pursuit.
47Johnny & Dark Vegan's Battle Brawl ManiaDark Vegan once again tries to destroy Johnny, who is trying to cheer up lonely Repto-Slicer.
48A Scholarship for JohnnyHugh wants to train Johnny to be good at sports so that he could get a sports scholarship to college.
49Johnny Boat RacingJohnny, his friends, and his enemies all compete in a boat race against an arrogant rowing team.
50Johnny Lock DownJohnny is determined to get a flytrap plant from his sisters for his school's science fair.
51Good Ol' Johnny TestJohnny is in charge of the school play about recycling while Susan and Mary create a garbage-eating monster.
52Johnny X Strikes Back AgainThe general takes away the lab, and than builds agent cyborgs. They charge up Johnny X and their friends to stop them!