Animation for the first and second seasons and by Cookie Jar Entertainment for the second season onwards. It premiered on Kids' WB on September 17, , which continued to air the series through its second and third seasons. The rest of the series aired on Cartoon Network starting on January 7, , in the United States and internationally. The series revolves around the adventures of the title character, Johnny Test, an year-old suburban boy who lives with his parents, his "super-genius" year-old twin sisters, Susan and Mary, both of whom are scientists and best friends with each other, and a talking dog named Dukey. They reside in the fictional town of Porkbelly, which is in the United States or Canada.

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Johnny Test
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Johnny travels to the center of the earth to recover a lost camera, uses his sisters' ingenious shrink-ray machine with disastrous results and more. The girls test a device on Johnny that will make him look good at their party, but he turns into a monster. Johnny and Dukey bribe the girls to give them gills so they can breathe underwater. The Ice Pigs hockey team are big losers, so Johnny asks his sisters for help. When Johnny asks his sisters to improve his intellect, they invent smarty pants. Johnny and Dukey use a gadget to travel into the latest Speed McCool movie. At the science expo, Bling-Bling shows up with his newest evil invention, the Repto-Slicer. Susan and Mary invent a neural obedience collar to control Dukey's every move. Johnny can shred skateboarding video games but has trouble doing the real thing on a half-pipe.
Skip to Content. The show isn't out to teach any specific positive messages, though you could argue that it promotes curiosity and an interest in science. Johnny's sisters' penchant for testing their ideas on their brother could give older siblings iffy ideas about how to treat younger ones. Johnny's twin sisters are geniuses a good thing for female characters , but they put their smarts to use by experimenting on their brother without their parents' knowledge less of a good thing Parents and caregivers: Set limits for violence and more with Plus. Parents need to know that Johnny's sisters experiment on their younger brother without their parents' knowledge, which might give some older siblings mischievous ideas. There's also some potty language and cartoony physical humor. Join now.