Its Broadcast Day in Ms. Frizzles class. Ralphie promised everyone hed figure out what kind of show they should put on. But Ralphie is sick and cant come to school. So everyone climbs aboard the Magic School Bus because if Ralphie cant come to class Ms. Frizzles class will come to him! Join the class as they travel Ralphies bloodstream to find out how germs make him sick and how his body can make him well again.
