Summary
Highlights
Johnny is preparing for the Founders Day parade when his sisters accuse him of stealing their inventions, including construction drones, mega grabbing gloves, and a super suit. Johnny denies the accusations, having only "borrowed" an X-ray gun. They soon realize a new villain is responsible.
A villain, who calls himself 'Super Mega Villain Man,' reveals himself, having orchestrated the theft to trap Johnny and his sisters. He freezes the sisters and escapes in a blimp. Johnny and Dukey pursue him, facing amusing obstacles like a traffic cop who can't differentiate between an 'ice cube' and an 'ice dog'.
Johnny tries various methods to stop the blimp, like lassoing it with his cowboy hat and using giant chewing gum. He eventually gets captured and ends up in the same cell as his sisters. They realize the villain's goal is to prevent them from ruining the parade, revealing a vault filled with their stolen gear. Johnny realizes the mayor is the new villain.
Johnny's sisters use a diamond-studded tooth to drill through the cell wall. They retrieve their gadgets from the vault, which are dismissed as lame. However, Johnny uses these ordinary items—toasters, spring shoes, and sticky string—as weapons to take on the mayor during the parade. Despite the chaos, the crowd enjoys the 'super mega battle,' leading to a bizarrely successful parade.
Johnny's parents leave him in charge of the house for an hour with strict rules: no friends, no overeating, clean kitchen, and stay away from the lab's micro-beetle. Johnny, confident in his responsibility, sends his parents off. His sisters, concerned, secretly set up a 'secret password' for emergencies, but Johnny accidentally triggers it.
Left alone, Johnny and Dukey embrace their freedom, turning cleaning into a game with an automatic vacuum cleaner and using a meatloaf trophy as a ball. Johnny gets bored and despite warnings, ventures into the lab, unleashing the destructive micro-beetle. He then invites all his friends over for a party.
Johnny's dad, alerted by a chirping bird with Johnny's password, rushes home with his sisters. Meanwhile, the house descends into utter chaos with a party, rampaging micro-beetle, and general destruction. Facing the imminent return of his parents, Johnny uses the emergency password to summon the army for a quick cleanup. They managed to rebuild the house just as his parents arrive, completely unaware of the mayhem.