Driven batty by their lessons on nocturnal animals, the students in Ms. Frizzle's class participate in a nighttime adventure that features the bus's new wings.
When Ms. Frizzle, the strangest teacher in school, takes her class on a field trip to the waterworks, everyone ends up experiencing the water purification system from the inside.
With help from Red Beard's treasure map, Ms. Frizzle and her class discover the animals and plants of the coral reef and their symbiotic relationships.