Another excellent episode from Season Two. After a series of practical jokes by classmates, Ms. Beadle resigns from the school. The school board determines a male teacher would be better suited for the class. Hannibal Applewood arrives the following week, and on recommendation from the Olesons, proceeds to torment Laura as much as possible, even suspending her from class for something she didn't do. When Charles realizes Applewood's true nature, he has Mary and Laura go to school without their homework intentionally so he can catch the mean teacher in the act. But the true "troublemaker" of the episode's title turns out to be two older students who caused the trouble in the first place. Eventually, Applewood is driven out of Walnut Grove by the Town Council..