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, discovers them!

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!

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!

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!