Based on the Oh Yeah! Cartoons short, 10-year-old Rudy Tabooite is an imaginative fifth grader with a cartoon-hating teacher. One day, after being punished by his teacher in class, Rudy discovers a piece of "White Lightning" chalk which allows him to access an alternate dimension known as ChalkZone, where objects erased from chalk exist as tangible objects and characters drawn in chalk come to life. Rudy becomes friends with Snap, a superhero-like character he drew just recently who has come to life in the new dimension.