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Ralphie is wondering what happened to all the salmon. They need them for the school fish fry, but none of them are there. Ms. Frizzle has decided to take the class on a field trip to find out. She turns the bus into a salmon and puts a compact disc in it that makes it think like a real salmon, so it will go wherever Ralphie's salmon went. However, when it starts migrating, Ralphie changes his mind about doing anything to find out what happened to the salmon. He, Keesha, Carlos, and Wanda attempt to stop it, but to no avail.
