Zack, Cody, Bailey, London, Maya, Addison and Woody look forward to college as they prepare to graduate from Seven Seas High.
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.
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.
Woody accidently releases a crate of snakes on the boat, and it's up to him and London to track them all down before the situation 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.
Before Cody can confess his feelings for Bailey, her ex-boyfriend, Moose, shows up and tries to win her back.
London offers to take Bailey home for her grandma's 90th birthday party. Meanwhile, Zack and Woody challenge Moseby to a basketball game.
When he gets stuck writing a paper, Woody asks Cody to show his visiting sister around the ship -- but fails to mention how pretty and cool she is.
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.
When London refuses to help with a charity event because she just doesn't grasp the concept of giving, she's 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.
Zack and Maya are finally a couple, and Zack is surprising everyone by being a good boyfriend.
The Tipton is docked in New Orleans during the 150th anniversary celebration of the sinking of a steamship.
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.
When Cody and Bailey are returning each other's things after their breakup, they begin arguing over who should keep Buck, their pet rat.
The Tipton docks in Tokyo, and Zack and Cody visit Carey on set of a Japanese soda commercial.
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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