Our favorite fearless space hero, Zack is still on the lookout for his lost spacecraft, the Risky Rascal. Suddenly, he and Omega Chimp receive a class 2-B distress signal -- a group of orbiting second graders is in need of a hand! A renegade band of warrior space mice -- the Warlords of Nibblecheese -- has kidnapped the class's teacher. Not only are these pint-sized rodents planning to destroy the Earth, but they also want to eat the moon (everyone knows it's made of cheese!). Zack knows he must spring into action -- even if it does mean saving Mrs. Craterbrain, the very teacher who gave him tons of math homework! Can Zack, a genuine intergalactic space hero, trap this army of cheese-hungry, teacher-stealing pip-squeaks, or has the final bell rung for planet Earth?