Ms. Frizzle teaches her class about insects and their world by using the magic school bus to turn them all into insects themselves.

When the valuable steam engine from an antique model railroad system vanishes during Oakdale History Month, Wishbone and his friends try to unravel the mystery of its disappearance.

Ms. Frizzle's class hops aboard the Magic School Bus to get Wanda's kite back and learns about wind.

Ms. Frizzle's class is holding a recycling drive. But when Phoebe loses her necklace, the kids hop on the bus to track it down.

When Keesha discovers mold on her sandwich, Mrs. Frizzle takes the class on a tour of the mini microbe world where the kids learn first hand that these tiny beings can have huge effects.

As Halloween approaches, a practical joker targets the kids of Oakdale, and the jokes are starting to get out of hand, so Wishbone and his friends set out to find the joker before the special costume party is ruined.

Ms. Frizzle's student Arnold goes on one of her field trips and finds that learning about food chains is much more interesting than he had originally thought.

Ms. Frizzle's class goes on a field trip to visit Arnold's uncle who is a forest firefighter. They end up IN a forest fire!!!