The Animorphs discover that the Yeerks don't have enough Kandrona Rays, so a lot of Controllers are getting sick, like Tom. One of the Controllers is science teacher, Mr. Perkins, who is now on a crusade to free other Controllers. Marco, Jake and Mr. Perkins are all on a hunt to save Tom, but he escapes. Tom comes back and tries to capture Mr. Perkins, but Jake as a tiger, and Marco as a wolf come to his rescue. Later, Jake and Mr. Perkins talk about how they will help each other in the future.