Little Johnny Test kicks up his heels as he embarks on merry and playful adventures all over town.
As things start vanishing into thin air, Johnny and Dukey believe they were taken by mole people. / Susan and Mary's plan to make Gil love them misfires, as the gum they give him turns him into a wild monkey.
Susan and Mary invent a piece of equipment that can turn things into gold, and they call it the Alchemy 5000. / When Sissy and Bumper tease Johnny about not being good at baseball, he seeks help from his sisters.
As the girls finally get to throw a dance party, things take an unexpected turn when they conduct an experiment on Johnny. / Johnny and Dukey take on a bunch of unruly teens.
As they want to be able breath underwater, Johnny and Dukey try to convince the girls to give them gills. / Johnny is surprised to find out that he's not popular at school because of his backpack.
Johnny enlists his sisters' help as the Ice Pigs hockey team keeps losing. / Dad feels anxious as he makes preparations for an important client of Mom's who's coming to dinner.
After an embarrassing incident at a spelling bee, Johnny asks his sisters to help make him more intelligent. / As Mom takes Susan and Mary with her to work, Johnny feels jealous and decides to follow them, nearly causing a disaster.
As a reward for Johnny, Susan and Mary animate his Mega Roboticle toy with their Static Animator. / After Susan and Mary build a spaceship, Johnny steals it to travel to the moon.
Using an elaborate high-tech helmet, Johnny and Dukey find themselves inside Speed McCool's latest movie. / After breaking Dad's bowling ball, Susan and Mary use their invention to go back in time and have the blame laid on Johnny instead.
As Susan and Mary display a new invention at the Science Expo, Bling Bling Boy unveils his own, the Repto-Slicer. / Johnny asks his sisters to make him a high-speed scooter.
As Dukey keeps breaking Susan and Mary's stuff, they design a neural obedience collar to keep him in check. / As a pimple appears on Mary's skin, the girls invent a pimple cream, which ends up having an adverse effect.
Despite being adept at skateboarding video games, Johnny finds the real sport to be much more difficult. / Instead of cleaning his room, Johnny resorts to the Turbo Action Backpack to shrink his toys and do the trick.
As he wants to be a genius, the coffee cart worker at the Mega-Institute comes up with a drink that makes the brains of the students freeze. / As Johnny tries to avoid school, he decides to make it snow using a gadget invented by the girls.
With Johnny getting crushed in dodgeball by Sissy, he cuts a deal with the girls, who agree to give him a bionic arm. / Hoping to make an impression on Susan, Bling Bling builds an animate monster truck.