London offers to take Bailey home for her grandma's 90th birthday party.
Graduation gets moved earlier when Mr. Tipton sells the S.S. Tipton. Cody and Bailey anxiously await their acceptance letters to Yale and Zack decides to break up with Maya to avoid a long distance relationship.
The senior prank backfires when Moseby angrily cancels prom, but Zack devises a way to have a secret underground prom in order to make Maya happy. Also, Bailey becomes obsessed with becoming prom queen once she finds out London is out of the running.
Woody accidently releases a crate of snakes on the boat, and it's up to him and London to try and track them down before it gets out of hand.
When Moseby, Zack and Woody hear about the tornado that hit Kettlecorn, they embark on a mission to get to their friends. Meanwhile, Cody asks Mr. Tipton to step in and help save Bailey's farm so that she can come back to school.
Cody arrives in Kettlecorn, but before he can confess his feelings for Bailey, her ex-boyfriend, Moose, shows up and tries to win her back. When a tornado approaches, Bailey gets knocked out and goes on a journey with a scarecrow, a tinman, and a lion.
London offers to take Bailey home for her grandma's 90th birthday party in Kettlecorn. Meanwhile, Zack and Woody challenge Moseby and his brother to a basketball game - only to discover that Moseby's brother is basketball player Dwight Howard.
When Miss Tutweiller assigns the class to write and direct a one act play, Cody and Bailey both write their own versions of their breakup. Meanwhile, Zack notices that Moseby isn't his usual self.
When London refuses to help out with a charity event because she just doesn't get the concept of giving, she is visited by three ghosts.
Cody decides to visit a remote scientific research station in Antartica and Zack and Woody decide to tag along in order to go snowmobiling. But when they reach the station and the scientist leaves with their snowmobile, the boys are stranded.
Woody asks Cody to show his sister, Willa, around the ship when he gets stuck doing a paper - but fails to mention how pretty and cool she is. But when Cody takes Willa on a date, he then learns exactly how much like Woody she can really be.
Zack, London and Woody head to a posh beach club for senior ditch day, but when the bouncer won't let Woody in, London and Zack go in without him. Meanwhile, Ms. Tutweiller gives Bailey and Cody an assignment to try and see who can have more fun.
The Tipton is docked in New Orleans during the 150th anniversary celebration of the sinking of the steamship Jesse Bell. When strange, paranormal things begin to happen to Zack, he begins to believe that the captain of the ship is haunting him.
The Tipton docks in Tokyo and Zack and Cody visit Carey on set of a Japanese soda commercial she's been hired for. But when Zack wrecks the set and Carey doesn't have enough money to pay for the damages, Mr. Hashimoto forces them to work off the debt.
Zack and Maya are finally a couple, and Zack is surprising everyone by being a good boyfriend. But Zack soon faces his first challenge - Maya is chosen to recite a poem at Poetpalooza at the same time as an important 'guys' video game night.
When singer Sean Kingston comes aboard the boat and falls for London, Zack tells him he'll help him plan a party for London to win her over. But, Zack secretly uses Sean's money to throw a party for Maya's birthday instead.
Zack and Cody Martin are aboard the SS Tipton, a luxury passenger cruise liner owned by Londons father. The ship cruises the world with tourists and students who attend classes at Seven Seas High.
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