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Johnny Test concerns the adventures of Johnny Test, an average 11-year-old boy, who lives with his intelligent twin sisters, Susan and Mary and his talking (and talkative) dog Dukey, in the town of Porkbelly. As a recurring gag, they use their young brother as their test subject for various experiments (thus their surname of Test), of which to impress Gil, their next-door neighbor. Sometimes, Johnny would also be given his sisters' gadgets, or superpowers to use in combat or other situations. At times Johnny borrow some of the devices and special powers that the twin sisters had developed and invented to do their own dirty work, and then try to undo disasters and messes that they have created, as well as to fight evil villains found in Porkbelly.