Ms. Frizzle's class is learning about leaves. The students are playing a game called Leaf Hunt, but they can't find one of the leaves. Ms. Frizzle says it's time for a field trip, and the kids get on the Magic School Bus. They are going to track down the missing leaf. As always, Ms. Frizzle's class finds all kinds of excitement on their search for science facts. Hop on the Magic School Bus!