Members of an elite group of scientists are disappearing and Chief Harrison's close friend, Alfonzo Martina, is next. Max and Linden eagerly accept their mission to guard the world-famous professor—until Max finds out that Alfonzo's specialty is leeches. Not a fan of animals, especially small, slimy, bloodsucking ones, Max soon uncovers a wretched plan to ruin not only the professor but the entire world. Will Flea-Powered Trainers and Sherbet Liquefier be enough to save the two spies, the professor and his leeches from a slimy end?