Rudy Tabootie is a 10-year-old fifth-grader who loves to draw, but Reggie Bullnerd, the school bully, is always teasing him or getting him into trouble with Mr. Wilter, Rudy's grumpy school teacher who strongly dislikes cartoons. One day Rudy discovers a piece of "White Lightning" chalk, which allows access to the ChalkZone, a place where everything and everyone that has ever been drawn in chalk and erased takes form as living or is tangible. He soon makes friends with Snap, a small, blue, humanoid drawing made by Rudy when he was only eight. Snap wears a superhero uniform and is very adventurous and witty. Rudy only lets one other person know about ChalkZone, his best friend and crush Penny Sanchez, who acts as the genius of the group.