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Cody and Bailey are planning to celebrate their one year anniversary when the SS Tipton docks in Paris. Cody asks London to help him make his date perfect. However, a big misunderstanding begins when Bailey sees Cody with London (who were just practicing the date) and mistakes her as the "hideous French girl". The next day, the day of the anniversary, Cody sees Bailey with another guy, Jean Luc, who was just trying to cheer her up. Bailey and Cody start arguing about the misunderstanding, and decide it would be better if they broke up. Meanwhile, Zack and Woody are pursued by art thieves.

Arwin comes on board the SS Tipton to improve the ship by adding a robot. However, problems start to occur when it begins to have feelings for Cody. Meanwhile, London and Woody enlist Zack's help to pass a gym class.

The S.S. Tipton visits Greece. While they are there, Bailey crushes on the tour guide, which makes Cody jealous. To impress her, Arwin's cousin, Milos, gives him a replica of the ancient amulet of the Greek goddess Aphrodite to give as a gift to her, but in a mix up, he ends up getting the real one. Meanwhile, London has to write a speech for her father, who is funding a new exhibit, but finds it very difficult, but then has a dream about Greek history, which inspires her.

No longer a couple, Cody and Bailey must choose who keeps Buck, their pet rat. Kirby investigates both to see who will make the better owner, but Woody is bitten by Buck, creating a super-hero alter-ego "Ratman."

Zack becomes attracted to a girl named Maya, but when he realizes he is actually falling in love with her, he attempts to use the six month plan Cody devised to date Bailey. Meanwhile, Dante, the boy who stole Marcus's identity in Paris, stows away on board to have Marcus produce his next album. In addition, Cody is trying to condition himself to forget about Bailey by flicking a rubber band against his wrist every time he thinks about her while she is visiting her home in Kettlecorn.

The class has a school project to complete and Cody chooses Bailey to be his partner, disappointing Zack who had hoped to get Cody to complete his and Woody's project for them. After Bailey tells London that she has partnered with Cody, London teams up with Zack and Woody. Cody is trying to catch a famous sea monster, but keeps failing and disappointing Bailey. Zack tries to sabotage Cody's project. However, his own project turns into a monster when London pours a smoothie into their plant project, causing it to grow and eventually trapping Zack, Woody, and London. The sea monster shows up at the end of the episode.

London holds a competition between Cody and Woody to decide which one of them will accompany her on her trip to the Tipton Space Station. Desperate to win, Cody and Woody each try to sabotage the other during the competition. Meanwhile, Zack is in charge of the senior citizen's activities and meets a passenger who is unwilling to participate in any of the activities. Zack makes multiple attempts to find something he wants to do and finally discovers that he enjoys playing pranks on other people. Together, they try to pull off a series of pranks on the other passengers.

The Seven Seas High dance is coming up. Having broke up, Cody and Bailey lie about having dates to the dance, so they quickly try to find a backup date to backup their lie. Now the pressure is on to see who has the best game. Meanwhile, Woody is tired of Tutweiller and Moseby arguing about who should get the skydeck for the school dance, so he makes them share the skydeck. It is revealed though flashback that Mr. Moseby and Miss Tutweiler's interest in the Middle Ages and 1980s, respectively, comes from the tribulations they endured as outcasts in their youth. Through understanding, Mr. Moseby convinces Emma that they both have become successful adults and have overcome their painful pasts.

Zack and Woody are convinced that a girl the S.S. Tipton rescued from the ocean is actually a mermaid. They make multiple attempts to prove it, but are unsuccessful. Upon her telling Zack that she is really a competitive swimmer and extremely busy training for the Olympics, Zack decides to teach her how to relax. Meanwhile, Cody is fired as the ship's towel boy after he doesn't allow passengers to use multiple towels in an attempt to protect the environment. He also puts up a show to portray the future of the Earth if this kind of overuse continues, which ultimately gets him re-hired as towel boy.

After Kirby injures Moseby, Connie takes over Moseby's work and breaks a boat in a bottle intended as a gift for the captain. Everyone tries to comfort Moseby, but none of them do any good. Moseby overhears mention of a problem with the boat and thinks there is a problem with the full-size ship. London eventually fixes the boat in a bottle. Moseby falls down the stairs and injures everyone except London. Finally, Moseby accidentally breaks the boat and doesn't have enough time to repair it.

Cody creates a web of lies to cover the fact that he didn't do his homework and it gets out of hand. Mr. Moseby and Zack get handcuffed together when their fighting gets worse.

When Mr. Moseby leaves to go to a reunion, Zack and Marcus decide to throw a party on the sky deck with models. Janice and Jessica, from the Boston Tipton, come aboard the ship as models and while Janice tries to draw Zack's attention, Cody believes Bailey is jealous of Jessica. Meanwhile, to distract the modeling agent from discovering the party, Woody pretends to be a male model named Woodlander.

London and Woody go to a posh beach club for senior ditch day, but when the bouncer won't let Woody in, London and Zack go without him. Meanwhile, in an effort to keep their perfect attendance records, Bailey and Cody show up for class, which annoys Ms. Tutweiller who was looking forward to her day off.

When the S.S. Tipton makes a special trip to pick up London from Parrot Island, Bailey, Moseby and Woody find themselves in jail because all the parrots left for Seal Island after Tipton Industries cut down all the trees. It's up to Zack and Cody to get them out of it but Zack and Cody end up in jail along with the others, and Bailey has to use her pig, Porkers, to rescue them. Zack and Cody fight for Bailey and Zack lets Cody have her after finding out about her ex-boyfriend Moose and seeing she has too much "baggage".

Zack and London play matchmaker for Mr. Moseby and Ms. Tutweiller, but with little success. Eventually, they get Moseby and Tutweiller together, and although they have an argument, they remain together. Meanwhile, Cody tries to impress Bailey by acting like someone else based on her dating test results. However, what Cody doesn't know is that some of her answers were for fun, while others were true.

The boys plan to have an all-guys weekend with their dad, but a surprise visit from their mom ruins it. When Kurt and Carey get a show on the ship, Mr. Moseby says they can stay on board, but worried their parents will permanently stay on the ship, the twins hatch a plan to sabotage their parents' show. Meanwhile, London tries to find the perfect belated birthday gift for Mr. Moseby by following him around all day. In the end, London makes Mr. Moseby very happy that he got a present from her because even his own mother forgot his birthday.

London wants to become the assistant to the ship's magician after she develops a crush on him. Meanwhile, Zack wants to spend more time with Woody.

London visits her grandmother in Thailand. Meanwhile, Zack asks Cody to go on a double date with him.

Zack and Cody receive a $200 check from their parents for their 16th Birthday, but have an argument about how to spend it. During the argument, they both wish they were an only child and once the ship enters the Bermuda Triangle, their wish comes true.

While producing a news show for Ms. Tutweiller's class, each of the kids find their own set of problems. Zack and Bailey clash as co-anchors, Cody makes a shocking discovery linked to London during his investigative reporting, Kirby reminisces about the good ole days, while London is having trouble with the green screen.

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 assigning the class to write their own play, Ms. Tutweiler selects Cody's play to be presented in class. However, Bailey refuses to participate after realizing the play antagonizes her role in the break-up between her and Cody, forcing Cody to act as Bailey and Zack as Cody.

When the ship stops in India, Cody takes Zack with him to visit his guru, a Swami who lives in the top of a mountain who charges high prices for everything he sells. Eventually, Zack and Cody run out of money and join the Swami's worldwide call center. Meanwhile, Mr. Moseby is having computer problems and is trying to contact the call center for help, but without any success. Padma, who was originally London's roommate on the ship, but left after London bribed her, asks London to help convince her mother that she was still at sea. It is later shown that the help center Moseby was calling was run by the Swami, who used an American accent.

A famous hypnotist visits the S.S. Tipton and accidentally hypnotizes London to act like Bailey, which gets her really annoyed. Meanwhile, Harvard's Dean of Admissions, Monroe Cabbit, is also visiting with his daughter Olivia. Cabbit is fond of Cody, but thinks lowly of Zack, although Zack wants to date Olivia. Since Cabbit does not approve of the relationship, Zack and Cody concoct a plan where Cody will pretend to date Olivia, which Cabbit approves of, but Zack will actually be the one who goes on the date.