Seatbelts, everyone! The Magic School Bus is back and ready to ride again. Professor Frizzle's kid sister Fiona might be the new teacher at Walkerville Elementary, but she's got the same old motto: take chances, make mistakes, and get messy! She decides to take the class camping, but come night fall their tent grounds are pitch black. But Arnold's been watching a ton of scary movies and has been having trouble going to sleep at night. What will Arnold do without a night light? The class thinks fast and learns a ton about renewable energy.