LarryBoy in the Attack of Outback Jack is the sixth chapter book of LarryBoy: The Cartoon Adventures. It was released on August 5, 2003.
The Australian supervillain Outback Jack and his sidekick Jackie are in search of buried treasure in Bumblyburg. No veggie can stand in their way. LarryBoy has to rely on retired superhero Pruneman to help him. But before they can capture Outback Jack, they must first battle the Hilaria-Mosquito, which stings victims with a green gag gas that keeps them telling jokes ... for hours. Will LarryBoy respect the wisdom that Pruneman has to offer? Or will the Hilaria-Mosquito make him the next super-comic?