Sees stars: When the kids see Horace Scope on the Star Shopping Network, they decide to buy Dorothy Ann a real twinkling star for her birthday. But Keesha doesn't want to buy anything sight unseen. So, Ms. Frizzle rockets the class off on a field trip to outer space.

Gains weight: 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.

Goes on air: 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!" Ralph 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!