Hubie hears about a new kid at school named Butch Pounder, who is supposed to be a bully, and visualizes a variety of horrible rumors, concocting different ways to defend himself.
The students must deal with a scary bus driver named Mr. Fenderbender, mosquitoes as large as Dracula, and their mean teacher, Mrs. Green, on their class trip to the Black Lagoon.
The students in Mrs. Green's class think their new classmate is from Mars and wonder what he will be like, only to be surprised when they find out where he is really from.
Kids are spreading rumors about what a horrible cook the new cafeteria lady is, so everyone is expecting the most disgusting lunch possible, but when they sit down to eat, they find a pleasant surprise.