There's a thief in town, and all signs point to 12-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!