Carl Ottinger loans his antique railway system to Pepper Pete's Pizza Parlor for Oakdale History Month, but the theft of engine could mean the end of Pepper Pete's unless Wishbone and his friends can solve the case.
When other players on the basketball team suspect Joe of playing the practical jokes which are destroying their morale, Wishbone helps his pal find the real culprit.
Arnold, a reluctant pupil of Ms. Frizzle, goes on a field trip on the Magic School Bus with the rest of the class, including his annoying cousin Janet, and as they learn about ecosystems, Arnold realizes that he is learning a lot about food chains.
