It's the International Show-and-Tell Competition and Arnold and DA are representing Ms. Frizzle's class. Arnold brings in a webbed hoop, left behind by his great-aunt, a famous archaeologist, but he has no idea what it is! Can the kids find out what it is before Arnold and DA take the stage? With Alex Trebek as the "Sportscaster."
The class finds Ms. Frizzle inside her closet -- playing a pinball machine she created with light pulses instead of steel balls. With time and the light pulses running out, the kids must discover the secrets of color -- before the principal, Mr. Ruhle (Paul Winfield), discovers them!
Ralphie wants to serve salmon at the annual school picnic, but he can't find any at his favorite fishing spot. But when the kids are "Frizzled" inside a salmon-bus they have an uncontrollable urge to head upriver.
Is Mr. Sinew (Dan Marino) any match for the Friz? 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, so the class travels inside her body for a closer look.
Phoebe tries to grow a vine for the school play, Jack and the Beanstalk. But her plant is more like a beansprout than a beanstalk! With the opening curtain only moments away, Ms. Frizzle turns Phoebe into a bean plant so she'll grow into the star of the show!
The kids rent a rain forest cocoa tree as an Earth Day present for Ms. Frizzle. But when the harvest arrives, there's only one shriveled cocoa bean! Ms. Frizzle takes the class to the rain forest to meet the impeccable Inspector 47, Matt Frewer, who keeps a tidy, mud-free cocoa grove. What has Inspector 47 done to the rain forest's intricate ecology web?
To celebrate the founding of Walkerville, Ms. Frizzle's class sculpts a stone likeness of its founding father, Captain Walker. As they add the finishing touches, the statue tumbles down the mountain. Ms. Frizzle turns the Bus into a huge boulder and the kids into rocks while bumping down the mountain in a desperate attempt to save the statue.
It's the last day of school before the winter holidays and Wanda plans to see The Nutcracker ballet. But during a trip to Murph's (Dolly Parton) recycling plant, the toy soldier she needs to get into the theater accidentally becomes a plastic pellet! Ms. Frizzle activates the Bus's Un-Recycler, taking the class and Murph on a song-filled field trip, where they learn how everyday items are made from recycled trash.