The beloved Miss McGillicuddy has left school and the gang is faced with a new teacher, one Miss Crabtree, whose name alone suggests a mean old lady to the gang. They plot several means of running off the new teacher, including ants, sneezing powder, and a mouse. On the way to school, one of the gang, Jackie, is picked up by a lovely lady who asks him about his school. Jackie reveals all the gang's plans to ruin things for Miss Crabtree. The only problem is that a sweet young woman Jackie has hitched a ride with is none other than... Miss Crabtree.