The Magic School Bus - Season 4 (1997)

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!!

Arnold is about to have the honor of being the first kid to receive one of the Rocky Awards at the annual Granite Awards. However, he has an embarrassing predicament.

When the kids see Horace Scope on the Star Shopping Network, they decide to buy Dorothy Ann a real twinkling star for her birthday.

Phoebe is chosen to give a slam-dunk exhibition during the big basketball game. When she finds she can't jump high enough because gravity is "pulling on" her, Ms. Frizzle takes the class into space and turns the Bus into a planet - with adjustable gravity!

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.

It's Valentine's Day and the class is selling lightbulbs. When they stop at Ms. Frizzle's house to sell her one, they find that her battery-operated doorbell doesn't work.

Ms. Frizzle's class opens the school for Mr. Ruhle (Paul Winfield). 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!

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, 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.