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.

When Jack casually gives Durbin some marriage advice, it backfires, gets Durbin kicked out of the house, and Jack takes him in. The A.P. Bio kids tell Jack if they can get Miles' DNA, they'll learn a little biology while pulling off the ultimate revenge.

After an embarrassing video of him falling off a stage goes viral, Jack plans a viral video of his own. Durbin, Helen and the teachers track down Whitlock's most notorious litterer: The Sugar Daddy.

Jack has the students form a fake cult to sabotage Principal Durbin's new school uniforms.