Lily Tomlin

The class learns that the town swamp is an important habitat and natural water filter, but the town council's not convinced until...FLOOD!

Ms. Frizzle takes the class to the rain forest to meet Inspector 47 who keeps a mud-free cocoa grove. What has he done to the rain forest's intricate ecology web?

The class learns about habitats when Ms. Frizzle transforms the bus into a frog to help look for Wanda's missing pet frog!

When Arnold accidentally swallows his miniaturized class, his digestive system becomes the class field trip!

Always the caring soul, Phoebe goes on a crusade to save the animals and plants of the desert - and discovers how well they take care of themselves.

Ms. Frizzle takes the class on a dinosaur dig, courtesy of her old school chum, a paleontologist, and travels 67 million years back in time!

Ms. Frizzle takes the class on a field trip to R.U. Humerus's (Tony Randall) Body Shop.

The class is thrilled about its concert at the Sound Museum -- until they discover the spooky mansion is more of a thrill than they bargained for.

At this year's "Teacher-athalon," the kids fear Ms. Frizzle doesn't stand a chance against the muscle-bound gym teacher from another school.

Ms. Frizzle combines Dorothy Ann's physics and Ralphie's baseball into a "Frictionless Baseball Game."