Hacker's adorable niece is back in the Northern Frontier and so is a new pet, Sparkletoes! While visiting another cybersite, Harmony convinces Hacker to let her bring it home. It causes chaos in no time. When Hacker sneakily releases it into the wild, it multiplies and takes over the entire local ecosystem. With help from the CyberSquad, will they round up all these rambunctious critters? Topics: Invasive Species; Comparing and Charting Data; Reading Maps; Doubling Big Idea: Introducing a living thing to a new environment can sometimes cause harm to the plants and animals that already live there.