Zack and Maya are officially together and she hopes he'll be able to attend her poetry reading on stage. The trouble is it's scheduled at the same time he, Cody, Woody, and Mr. Moseby are competing in an online war game for the championship against an Australian team. As a result, Zack splits his time between the two events. Meanwhile, for a community service project, London and Bailey run a daycare program for young children who seem to prefer London and Bailey doubts herself until trouble arises.

Carey joins the boys while they're in Japan when she's selected to star in a soda commercial by a businessman who's taken a liking to her when he saw her perform at the Tipton. Shooting the commercial is difficult enough since the soda is flavored with shrimp and tastes awful. Things get worse when Zack smashes an expensive camera and the family has to pay for it by becoming tasters at the soda factory. Meanwhile, Woody is able to defeat a sumo wrestler in the ring to win an unlimited ship gold card. However, having lost his confidence, the wrestler continuously hangs around Woody, getting him annoyed to the point of facing him in the ring again in hopes he finally leaves the ship. Also, London does everything she can to avoid going to the dentist.

After the students pull a prank on Mr. Moseby, he cancels the senior prom. So, Zack comes up with a plan to have a "secret prom". Meanwhile, Bailey tries to get everybody to vote her for prom queen while Cody helps Woody ask Addison to prom. Ultimately, the kids award the roles of king and queen to Mr. Moseby and Ms. Tutweiller.

Mr. Moseby announces that London's dad, Mr. Tipton is selling the ship and that it will be dismantled within a week.