If popularity were a score between one and ten, Charlie Drinkwater would be a zero. He's nerdy and unathletic, and to top it all off, he's suddenly morphed into a giant mutant sea creature sometime between first-period science class and third-period English. Now Charlie's two best friends are treating him like a science project, there's a petition to get him kicked out of school, the cool kids are recruiting him for their clique, and for some reason his parents are acting like everything is perfectly normal.
There's a thief in town, and all signs point to twelve-year-old Charlie Drinkwater. Once you spontaneously morph into a giant mutant dinosaur in the middle of the school day, people will suspect you of just about anything. Charlie's teachers decide that all he needs is a little discipline, so they make him join the swim team. The only problem is, Charlie is terrified of the water. (He's terrified of a lot of things). Charlie and his friends vow to apprehend the real criminal and clear Charlie's name. But when they discover who the actual thief is, Charlie's problems get a whole lot bigger…not to mention slimier, scalier, and smellier!