The manager of a rival Revolutionary War themed grocery store challenges Zack, Cody, and their boss to a speed-bagging competition. Mr. Moseby takes in his niece Nia, in order to smooth out her sassy attitude and short fuse. When it becomes clear that Maddie's replacement Millicent finds her job much too stressful, Moseby believes that a job at the candy-counter might be the perfect remedy... until she talks London into taking her to a concert and inviting the band, their crew, and their groupies over for a wild party.
—Daniel Timothy Dey