One evening, Harold takes a walk on the beach. With the moon to keep him company and his purple crayon in hand, he has everything he needs for an adventure on the high seas.

Tonight is the Big Night sleepover at Dunwiddle Magic School, when all the fifth graders stay overnight at school and participate in the scavenger hunt. Except Nory's friend Elliott is attending a concert at rival Sage Academy where he plans to attend after the winter break. But if Nory can convince her fellow upside-down magic friends to take the hunt seriously, cooperate, and win, than maybe she can convince Elliott to stay at Dunwiddle.

When Stink's parents win an aquarium sleepover, he and his two friends enjoy a scavenger hunt before trying to fall asleep while worrying about the frankensquid on the loose.