If there’s a problem in school, there’s no substitute for the world-saving substitute teachers of the S.O.S.! This is the fifth book of this hilarious, highly illustrated early chapter book series.Keep your friends close and your enemies closer! When Snowball, the puffball hamster in Ms. Kim’s classroom, accidentally sips the teacher’s leftover protein shake, she transforms into a monster like Beacher Elementary School has never known before. It’s all hands on deck to stop Sn