With Mr. Garrison missing, and a new school year beginning, it's time to enter the fourth grade. The new teacher is Ms. Choksondik, a woman who actually seems intent on teaching the class. The students miss the third grade already, so they enlist two local college students to build a time machine to take them back. In the present, Ms. Choksondik is becoming increasingly frustrated with her inattentive class, so she hunts down Mr. Garrison to learn how to manage the class. Meanwhile Mr. Garrison is coming to grips wirh his sexuality.