Topic: Volcanoes. To help them understand how the Earth makes islands, Ms. Frizzle presents the kids with an island that hasn't been discovered yet.

Topic: Body Mechanics. Ms. Frizzle takes the class to a field trip to R.U. Humerus's Body Shop.

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.

Topic: Bats. When Ms. Frizzle invites the class' parents in to see that their kids are learning about bats, Ralph and the gang are convinced the Friz is a vampire.

Topic: Butterflies. The class needs a new mascot for its soccer team. Phoebe suggests butterflies, but everyone thinks they're wimpy--until the Friz flutters in.

Topic: Water. The class takes a wild ride with the Friz through the water cycle.

Topic: Microbes. Keesha and the class return from vacation to find her prize cucumber has turned into a pickle. Could the Mike Robe Gang be to blame?

The school district's vehicle maintenance inspector, Junkett, is about to condemn the Magic School Bus.

Shrunk inside Tim's model airplane, the class goes on a high-flying field trip to find out how things fly.

Topic: Energy. The class is ready to plug in their "Double-Trouble Wheel of Wonder" at the town carnival, when they discover all the electrical outlets are taken.

Topic: Space Rocks. When Dorothy Ann warns the kids there's an asteroid headed straight for their school, Ms. Frizzle arranges a friend trip into space.

Topic: Warm/Cold-Blooded. Liz has gone off to a mysterious place called Herp Haven. Thinking she's in trouble, the class rushes to Herp Haven, where they turn into reptiles.

There's a monster in Walkerville Lake. Wanda competes with Gerri Poveri, a TV reporter, to be the first one underwater.