Title: “Revving Up”
Written By: Sean Kelly, Brian Meehl, George Arthur Bloom
Guest Star: Sherman Hemsley
Original Air Date: October 28, 1995
Mr. Junkett (Sherman Hemsley), a vehicle maintenance inspector, wasn’t pleased when he inspected the magic school bus. In fact, he decides to take it to the junkyard to crush it. The Friz and the class have to do something to save their bus. Naturally, they have decided to shrink and go inside it. All the problems seem to be caused by peanut butter, as Mr. Junkett was eating a peanut butter sandwich while inspecting the bus.