Ms. Frizzle"s class is studying electricity, when a thunderstorm hits. Suddenly there"s a blackout! "Let"s find out what happened!" says the Friz, and the kids are off on another unusual field trip. Once they find the broken power line - and zoom away from there fast! - Ms. Frizzle"s visiting niece, Dottie, gets a bright idea: why don"t they visit the power plant? There the bus is transformed into a dump truck, and the kids are dumped down the coal chute into the furnace! Fortunately, Ms. Frizzle brought along heat-proof suits. The kids become as small as atoms and travel with the heated steam