When Jack leaves his class unattended, a student injury sets off an official investigation and lands Jack in "teacher jail." An aggressive teacher's union rep sets her sights on Principal Durbin. The students' excitement for a substitute teacher are dashed when they find out it's Helen.

Jack puts his students on a new Miles revenge mission. At the same time, Helen, Principal Durbin's upbeat secretary, relentlessly tries to get Jack to make something for the annual bake sale.