Topic: Kitchen Chemistry. It's Ms. Frizzle's birthday, and a field trip to the bakery seems perfect -- until the bus' shrinkerscope goes on the fritz and the class gets baked in a cake. With Dom DeLuise as the Baker.
Topic: Germs. Ralphie is crushed when a fever keeps him home from school the day he's scheduled to host a FNN (Frizzle News Network) television broadcast on health. With Tyne Daly as Ralphie's mom.
Two inches tall and trapped in a bathroom at Wanda's house, the kids must use what they've learned about structures to escape before Wanda's mother discovers them.
Topic: Digestion. Arnold's so excited he doesn't have to go on a field trip! But when he accidentally swallows his miniaturized class, he becomes the field trip.
Topic: Sound. The class is thrilled about its upcoming concert at the Sound Museum -- until they discover the spooky mansion is more of a thrill than they bargained for. With Carol Channing as Cornelia C. Contralto.
Topic: Dinosaurs. Ms. Frizzle takes the class on a dinosaur dig, courtesy of her old school chum, paleontologist Dr. Carmina Skeledon, and travels 67 million years back in time.