Maddie Fitzpatrick visits the S.S. Tipton and gains a new friend in Bailey. Prince Jeffy of Linchtenstamp, who's only 8 years old, falls in love with Maddie and forces her to marry him. However, Zack challenges the Prince to a joust, with Maddie being the prize. Zack beats Prince Jeffy on a bouncing ball and using a water noodle weapon. Also, Zack finally gets his long-awaited kiss from Maddie.

A microchip with secret information on it goes missing and the twins help a spy recover it. Cody gives the chip to Bailey, telling her to hide it and not to look at what's in it, but Bailey looks it up on her computer anyway. When Cody finds out that Bailey ignored him, breaking her promise, he has mixed emotions. Bailey kisses Cody on the lips as a way of telling him he can trust her, so he forgives her.

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

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.

After Bailey and Cody try to get London to be smart for a bet, London becomes smart from a perfume. Meanwhile, Zack's prank for Woody goes awry when it accidently gets pulled on a female wrestler.

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.

The ship is struck by lightning when it crosses the International Dateline, which places Cody in the same day over and over. He tries to use each day as a chance to let Bailey know how he feels about her, but something gets in the way every time. It's then up to Cody to divert the ship from the lightning to set them back on the right course.

Maya's birthday is coming up and Zack decides to do something special for her. When singer Sean Kingston comes on board, he immediately becomes attracted to London. Zack misleads Sean Kingston into throwing a surprise party for London and also making Mr. Moseby believe it is for him, when it is actually a party for Maya. Meanwhile, Cody goes with Bailey to a Belgian chocolate factory on a couple's tour and runs into Woody who mistakenly came instead of attending a hiking trip.

Bailey gets jealous when Cody gets attention from other girls after he becomes the substitute home-ec teacher. Meanwhile, London tries to sell Zack's "paintings" which are things he's had in his mouth when he sneezed.

It's couples game night and the gang has a hard time finding a fun game everyone finds interesting. London tries to play a prank on Woody and it results in the release of a crate full of snakes. Meanwhile, Cody tries to prove he can be funny to Bailey and Zack tries to get forgiven by Maya when she learns how many girls he has dated.

As punishment for setting off a stink cloud, Zack is made hall monitor, a role which he takes way too seriously. After sending half of the school to detention, Zack experiences the repercussions of upsetting all of his friends. Meanwhile, Bailey gets a job at London's boutique, an extension of London's personal closet.

Hannah Montana boards the S.S. Tipton on her way to a concert performance in Honolulu. To impress Bailey, Cody desperately tries to get tickets to the show. Meanwhile, the Russo's are still aboard the ship on their vacation in which Alex pulls a prank on Justin by putting blue dye in the hot tub, making him turn blue, for which Mr. Moseby blames Zack, while Max tries to impress London with his magical suitcase. The crossover starts on Wizards of Waverly Place S02E25 Cast-Away (To Another Show) (I). It continues on Hannah Montana S03E20 Super(stitious) Girl (III).

The SS Tipton is going straight in the path of endangered blue whales motivating Zack, Cody, Bailey, and Marcus to try their best to change the ship's course. They lock themselves into the engine room hoping the whales will safely pass, however they discover it's not as easy as it seems. Cody begins to faint due to heat exhaustion, Marcus becomes desperate for water, and Zack loses it and tries to break free. Eventually, Kirby and Mr. Moseby break into the engine room to attempt to stop them, but after seeing the whales on Cody's laptop, they decide to go along with plan.

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.

A class assignment requires the students to simulate marriage to learn the challenges that face married couples in everyday life. Cody 'marries' Bailey, Zack 'marries' London, and Woody 'marries' Addison. However, when the "Wheel of Life" gives Cody as injury, he and Bailey begin to fight.

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.

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.

Esteban boards the boat to get married, however his mother doesn't approve of his future wife.

When Zack turns in one of Cody's old essays as his own, Ms. Tutweiller thinks he has a fear of bananas. Meanwhile, London goes through withdrawal when her cell phones are taken away in class.

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.

London, Zack, Cody and Mr. Moseby set sail on the S.S. Tipton for their semester at sea. London convinces her roomate to leave the ship so she can have a room to herself. Cody finds himself sharing a room with Woody, who is very messy, and Zack shares a room with Bailey, who is a neat freak. Nobody knows that Bailey is a girl who disguised herself as a boy in order to gain a position on the ship after she found that there were no more vacancies for girls. Zack and Cody agree to switch roommates, but Zack changes his mind after he finds out that Bailey is a girl. After everyone else eventually finds this out Bailey is allowed to stay, filling the position vacated by London's ex-roommate, and Bailey becomes London's new roommate. This is the last straw for London and she escapes to Parrot Island via helicopter.

Cody goes to a scientific research facility in Antarctica, and Zack and Woody tag along to go snowmobiling. But after they arrive, the head scientist steals their snowmobile, stranding the boys at the facility, leaving them to find ways to survive until help arrives. Meanwhile, London's favorite fashion designer comes on board to announce he's quitting the business. She eventually tries to inspire him to find some new ideas for designs and come out of retirement.

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.

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.

Cody shows Woody's sister around the ship. Meanwhile, London hires a double to do her chores, but she falls in love with Zack.

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.

Centuries in the future, Starship Tipton resident prankster Zerk (Zack's great-great-great-great-great grandson) plays a joke on feuding aliens and because of it, they vow to destroy the starship. The kids must travel to the future to save their descendants and fix the problem before it's too late. Meanwhile, London discovers that she has a great-great-great-great-great grandson, Rome, and that the Starship Tipton belongs to her family.

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."

While searching through an archaeological site in South America, Zack awakens the spirit of an ancient princess.

When the new aqua lounge is flooded, Mr. Moseby vows to expel the student responsible for the mess. Although Mr. Moseby assumes Zack is the culprit, Cody, Bailey (who had just returned from Kettlecorn), and Woody all believe they are each responsible for the disaster for different reasons. Meanwhile, Marcus leaves the ship to make a Broadway musical based on his hit song "Retainer Baby."

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.

Zack and Cody talk to Mayor Ragnar when the boat docks in Sweden, and they are shocked to learn that their ancestors were scoundrels and not heroes like the twins originally thought. Meanwhile, Moseby gets help from Marcus to find the missing screw for his nightstand, but they accidentally get stuck in a furniture store.

When London's father gives her one million dollars to find an invention to market, she enlists her friends to come up with a unique invention and offers them the cash as a prize. At first everyone comes up with their own ideas, but then they combine their resources, wreaking havoc on the ship with their multifunctional robot.

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.

Shortly after the start of a new semester on the ship, Zack, Cody, London, Bailey, and Woody are all cast-away on a life boat London was using as a closet and eventually find their way onto a deserted island. Cody's relationship with Bailey starts falling apart after an argument over wind patterns emerges and causes a fall out with the remainder of the group. Back on deck, Ms. Tutwieller and Mr. Moseby are put in exactly the same predicament as the others and even have the same disagreement over control of the operations. Cody and Bailey mend their relationship at the end of the episode.

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.

The gang all have dreams of being characters in three different fairy tales; Hansel and Gretel, Snow White, and Jack and the Beanstalk.

Jordin Sparks comes aboard the S.S. Tipton and Zack, Cody and Marcus try to write a song for her. Meanwhile, as one of London's Yay Me! contest, one of her fans gets to spend a couple days with her on the ship, but London's fan is a little crazy.

Cody tries to find out who stole a valuable book.

When Bailey starts feeling homesick, Cody decides to recreate her hometown festival. However, thanks to London, Bailey's hometown boyfriend, Moose, shows up. He and Cody compete in corn bobbin', arm wrestling, and chess to win Bailey's heart, but Cody loses every competition. Moose asks Bailey to come home, so she asks Cody what to do. Cody says to follow her heart and Bailey stays because she would miss her friends

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.

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.