It's Color Day in the Friz's class. Ralphie and the rest of the Magic School Bus gang are in for an enlightening experience as they compete in a brilliant relay to learn about light and color. When Ms. Frizzle announces that the class will be taking part in a Color Day relay, Ralphie is disappointed. He knows that a relay is all about speed, and he is always late for everything. His partners, Arnold and D.A., are smart, but they take their time to figure things out. Still, Ralphie soon realizes that his team can compete with the best and the brightest. Everyone has a chance to shine when the Friz is teaching about light and color. Get ready for a brilliant adventure with the Friz's colorful class.