The BEST episodes of Johnny Test season 3

Every episode of Johnny Test season 3, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Johnny Test season 3!

Crafty 11-year-old Johnny Test and his genetically modified talking dog go on high-octane adventures to save his family (and the world) from disaster.

Last Updated: 11/25/2024Network: Cartoon NetworkStatus: Ended
star
6.70
10 votes

#1 - Johnnyitis

Season 3 - Episode 13 - Aired 12/1/2007

Johnny drinks an unstable isotope so he can get sick and not have to study for a test for school. Unfortunately, not only does the isotope give him red spots and a purple tongue, if it's not cured within four hours, it's going to give him immense bloating, cause violent coughing, and eventually make him explode.

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star
6.69
13 votes

#2 - Here Johnny, Here Boy

Season 3 - Episode 5 - Aired 10/6/2007

Fed up with the lack of respect, Dukey has convinced Mary and Susan to turn Johnny into a dog. In the meantime Mary and Susan turn themselves into animals so they can get loved by Gil. It all goes wrong when Animal Control arrives and snatches them.

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star
6.55
11 votes

#3 - Johnny Test: Monster Starter

Season 3 - Episode 9 - Aired 1/26/2008

Mr. Black and Mr. White ask Susan and Mary to design a new weapon, so they make a helmet that allows the user to control things with their mind. But it becomes a huge mistake when it's stuck on Johnny's head, and his obsession with a new video game now makes any inanimate object he sees turn into a monster.

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star
6.55
11 votes

#4 - When Johnny Comes Marching Home

Season 3 - Episode 12 - Aired 11/10/2007

Johnny buys a video game which turns out to be a military plot to recruit an elite team of super soldiers, and then he must join the fight against a group of renegade penguins who are losing their home to global warming.

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star
6.42
12 votes

#5 - Bath Time for Johnny

Season 3 - Episode 8 - Aired 10/13/2007

Johnny refuses to bathe, and his family forcibly attempts to wash him. Meanwhile, Dukey is mad because he thinks Johnny forgot his birthday.

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star
6.36
11 votes

#6 - Johnny X and the Attack of the Snowmen

Season 3 - Episode 3 - Aired 9/29/2007

Brain Freezer creates an army of snowmen, and only Johnny X can stop him.

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Johnny vs. Bling-Bling Boy 3
star
6.36
14 votes

#7 - Johnny vs. Bling-Bling Boy 3

Season 3 - Episode 1 - Aired 9/22/2007

Johnny vs. Bling-Bling Boy 3 - When Eugene finds out that Johnny is what stands in the way of him and Susan, he sets out to lock Johnny up forever as he tries to get the last ingredient for his sister's "Susan-hating lozenge".

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star
6.27
11 votes

#8 - Johnny vs. Dukey

Season 3 - Episode 4 - Aired 9/29/2007

After Johnny and Dukey send Bumper packing, they start to come against each other in a game of "Say Uncle".

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star
6.17
12 votes

#9 - Johnny'mon

Season 3 - Episode 7 - Aired 10/13/2007

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star
6.00
9 votes

#10 - Johnny Applesauce

Season 3 - Episode 6 - Aired 10/6/2007

After hearing about American heroes in Social Studies class, Johnny decides to help his classmates by bringing back applesauce as a vigilante after the Lunch Lady outlaws it. However, this lands him into trouble.

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star
6.00
9 votes

#11 - Coming to a Johnny Near You

Season 3 - Episode 11 - Aired 11/10/2007

When Dukey explains how narration makes everything seem better, Johnny convinces Susan and Mary to make a reality warping megaphone, but it malfunctions.

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star
5.92
13 votes

#12 - Stinkin' Johnny

Season 3 - Episode 2 - Aired 9/22/2007

Johnny wants to buy an HDTV and the twins need an important ingredient for their experiment. The only solution: Enter Johnny in a professional wrestling competition so they can win $10,000, so they make Johnny a wrestling suit which allows him to spray stink gas from his suit.

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star
5.73
11 votes

#13 - Johnny Holiday

Season 3 - Episode 10 - Aired 11/3/2007

Johnny is upset because the holidays that give free candy to the world are spread too far apart, so Johnny decides to start his own holiday, known as Kids Get Free Candy Day, and try to spread free candy. When there are some adult protests against this holiday, Johnny, Dukey, Susan, and Mary gain an unlikely ally against this – the Beekeeper.

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Johnny Fu
star
5.20
5 votes

#14 - Johnny Fu

Season 3 - Episode 15 - Aired 12/15/2007

When Bumper uses kung fu moves to take over the school, Johnny seeks Dukey's kung fu advice, but to no avail.

star
4.75
4 votes

#15 - Johnny Test in Outer Space

Season 3 - Episode 20 - Aired 2/2/2008

While trying to find life on other planets, Johnny meets a leader from the planet Vegandon who attempts to destroy the Earth by sucking out its natural resources.

Johnny's Monkey Business
star
4.60
5 votes

#16 - Johnny's Monkey Business

Season 3 - Episode 17 - Aired 1/26/2008

Susan and Mary need to get Lolo away from Johnny and Dukey for various tests when they try to make a profit out of her in order to get a video game system.

Johnny Long Legs
star
4.40
5 votes

#17 - Johnny Long Legs

Season 3 - Episode 19 - Aired 2/2/2008

Johnny does a spider DNA experiment for his sisters but when Hugh orders Johnny to be normal, Susan accidentally increases the DNA and becomes a real spider. Now Dukey must save Johnny from the hands of Bumper and his pet snake.

star
4.40
5 votes

#18 - Johnny Mustache

Season 3 - Episode 14 - Aired 12/1/2007

Johnny has his sisters use an invention that will give him a mustache so that Johnny can get into a movie meant for older people. But when Bling Bling Boy pesters Johnny to use the invention on him, Johnny shoots the invention at him too much and now Eugene looks like the monster from a movie.

Johnny X: A New Beginning (JX6-a)
star
4.20
5 votes

#19 - Johnny X: A New Beginning (JX6-a)

Season 3 - Episode 25 - Aired 3/1/2008

It's time for the Earth Day Carnival and the Johnny Stopping Evil Force 5 (with Zizrar replacing the Beekeeper) returns and obtains the same mutant powers as Johnny X, and Super Dukey.

Johnny Kart Racing
star
4.20
5 votes

#20 - Johnny Kart Racing

Season 3 - Episode 21 - Aired 2/16/2008

All Johnny and Dukey want is a simple bike race between the two of them; but everyone joins the race.

star
4.00
2 votes

#21 - Johnny Smells Good

Season 3 - Episode 22 - Aired 2/16/2008

Johnny Smells Good - Johnny and Dukey test a perfume experiment and now everyone is attracted to them. They use this to their advantage, but it goes out of control.

star
3.75
4 votes

#22 - Johnny X: The Final Ending (JX6-b)

Season 3 - Episode 26 - Aired 3/1/2008

Johnny X: The Final Ending - Following the events right after "JX6-a: A New Beginning" Dark Vegan returns to destroy the Earth with an upgraded armada. Dark Vegan, with his upgrade armada, is cutting up the Earth's trees, taking off the oxygen and sucking up the Earth's water. Johnny, Dukey, and the Johnny Stopping Evil Force 5 team up to stop Dark Vegan and return the Earth's resources.

star
3.40
5 votes

#23 - Johnny Escape From Bling Bling Island

Season 3 - Episode 16 - Aired 12/15/2007

Bling-Bling Boy steals Susan and Mary's shoes, and it is up to Johnny and a reluctant Dukey to retrieve them before their dinner with Gil.

Return of Johnny'mon
star
3.33
3 votes

#24 - Return of Johnny'mon

Season 3 - Episode 23 - Aired 2/23/2008

Seeking revenge, Blast Ketchup sucks Hugh into the Tiny'Mon world, trying to suck Johnny in. Thinking he is one of Johnny's Tiny'Mon, he captures him. Johnny, Dukey, Susan, and Mary must stop him. To re-exit the game, they must win another battle with Blast.

star
3.00
3 votes

#25 - Johnny Dukey Doo

Season 3 - Episode 24 - Aired 2/23/2008

Johnny Dukey Doo - When a condemned hotel gets haunted by ghosts Susan and Mary drag Johnny, Dukey and Gil into the house to prove that the ghosts are fake.