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Johnny's an 11-year-old kid leading a pretty average life. Average, that is, except for his twin super-genius inventor sisters, talking dog sidekick, and nonstop thrill-ride adventures!

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Johnny Test

Johnny Test is always ready to test any crazy experiments his genius sisters Mary and Susan come up with. Joined by Dukey, who's both a loyal dog and best friend, Johnny never knows what kind of strange powers or weird side effects will happen when he becomes a test subject in his sisters' laboratory. Learn more about the show, play online games and watch free videos from Johnny Test on Cartoon Network.