Arnold, Ms. Frizzle, and the whole Magic School Bus crew find themselves in a Food Chain Frenzy as they digest lots of fab facts on ecosystems and eating habits. Ms. Frizzle is the weirdest teacher around, and Arnold is her most reluctant student. A field trip on the Magic School Bus can be torture for Arnold, and there is just one thing that can make it his cousin Janet. With his know-it-all relative's visit combined with an all-wheel learning adventure, it is sure to be a school day Arnold won't soon forget. The Friz is always hungry for adventure, and that's just what the class gets. With so much to learn about ecosystems, even Arnold finds himself eating up all the food-chain facts.