Arnold is alarmed to discover that the beloved Ms. Frizzle has been promoted and her younger sister Fiona is taking over the class. His worries come true when a simple field trip results in the Galapagos Islands being overrun by invasive bunnies. Can Arnold save the islands, and will he ever learn to like his new teacher?
Next stop...The Magic School Bus heads to the Galapagos to learn about invasive species!