It's "Accidental Science Project" day and the class has brought in marvelously rotten entries from the back of their refrigerators. With Ed Begley, Jr. as Larry Log-Away.

It's Ms. Frizzle's birthday, and a field trip to the bakery seems perfect -- until the bus's shrinker-scope goes on the fritz and the class gets baked in a cake! With Dom DeLuise as the Baker.

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

The class' garden is going to be featured on the cover of PLANT IT! magazine. But Phoebe's garden plot is glaringly empty. With Robby Benson as Mr. Seedplot.

The Friz transforms the bus into a Weathermobile and -- in a wild ride through the skies -- Ralphie becomes the meteorological superhero of his dreams.

The principal, Mr. Ruhle, has to go away for a few days and leaves his beloved chicken, Giblets, in Dorothy Ann’s care. The Friz takes the class on a field trip to see how eggs are made - from the inside out!

Ms. Frizzle’s “Uncle Shelby” wants the class to look after his beachfront property. The kids soon discover that this “luxurious” accommodation is only a tiny spot on the shoreline.

The only contribution the kids in Ms. Frizzle’s class have made to the Walkerville Space Capsule is an empty jar. “It’s not empty,” argues Keesha. “It’s filled with air!” Ralphie thinks that air doesn’t do anything, but when the bus shrinks and gets stuck inside the jar—the class finds that their only hope for escape is... air!

Should Walkerville get rid of the swamp and replace it with a great new shopping mall or build the mall somewhere else? The class learns that the swamp is an important habitat and natural water filter, but the town council’s not convinced until... FLOOD!

Flora Whiff, the famous expert on smell—whose “nose knows”— comes to school to judge the First Annual Smell Search. Ms. Frizzle’s class creates a unique smell that is bound to take first prize.

Ms. Frizzle’s class opens the school for Mr. Ruhle. But there’s so much to do! “There must be a way to do these chores without actually doing them,” says Carlos. Enter Mr. Ruhle’s new computer and Mikey, Carlos’ whiz kid brother!

City Critters: Ms. Frizzle’s class is visiting the zoo, which is, according to Tim, the only place in the city where wild animals can survive. To test this idea—ZAP!—Ms. Frizzle turns the class into possums, foxes, and falcons!

When Wanda discovers that one of Ms. Frizzle’s ancestors was Redbeard the Pirate, she naturally wants to follow the treasure map he left. The map leads the class to a coral reef, where they learn firsthand that life there is risky.

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.

Arnold's know-it-all cousin Janet drives the kids crazy when she joins Ms. Frizzle's class on a field trip and gets them lost in outer space!

Arnold's so excited he doesn't have to go on a field trip! But when he accidentally swallows his miniaturised class, he becomes the field trip!

Arnold and Keesha are in trouble when they forget to bring in their assignment on "two things that go together."

When Wanda's pet frog, Bella, jumps out an open window, Ms. Frizzle shrinks the bus into a mechanical frog and takes her now tiny class on a hop-along adventure.

Ms. Frizzle takes the class on a field trip to R.U. Humerus's Body Shop. They learn how bones, muscles and joints all work together to help us move.

Arnold and Wanda are due to give a report on the town waterworks. But Ms. Frizzle thinks it's field DRIP time! She turns the bus and class into water drops and the kids evaporate, condense, become rain and rush by river into the ocean. After several trips through the water cycle, they're ready to turn back into regular kids. But the magic key that will get them out of the cycle is locked in the school bathroom! Trying to work their watery way into the bathroom, the kids go through the town waterworks and see how water is purified. Can they get to school through bathroom pipes? Or are they stuck in the water cycle forever?

The kids rent a rainforest cocoa tree as an Earth Day present for Ms. Frizzle. But when the harvest arrives, there’s only one shrivelled cocoa bean! Ms. Frizzle takes the class to the rainforest to meet the impeccable Inspector 47 who keeps a tidy, mud-free cocoa grove. What has he done to the rainforest's intricate ecology web?

The class needs a new mascot for its soccer team. Phoebe suggests butterflies, but everyone thinks they’re wimpy—until The Friz flutters in!

The school district’s Vehicle Maintenance Inspector, Junkett is about to condemn the Magic School Bus!

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.

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. With Michael York as Herpst.