Maddie helps London become smart to win over the affection of a scholar. Meanwhile, Cody moves into the coat closet and makes it is own room after he has enough of Zack's sloppiness.

Mr. Moseby and the Tipton Staff is challenged to a bowling competition, by its rival, Ilsa and her team. Zack is the star bowler for the Tipton, but ends up having to be replaced due to getting grounded. Zack's replacement must overcome his emotional scars, due to a past bowling incident.

Zack and Cody discover a machine of Arwin's creation that can transport people from one dimension to another. They hop in, and find themselves back at a mixed-up version of the Tipton Hotel; where London is a candy girl/babysitter, Maddie is an air-headed rich hotel heiress, and other personalities are switched.

Zack dreams that he has gone back in time to the Boston Tea Party with his family and friends, where an act of protest by Maddie inspires the him to launch a present-day battle to save a historical park in Boston that's being threatened to be demolished.

Zack convinces Cody, Jessica, and Janice to go see a scary movie, but when it's Zack who gets scared, Cody uses it to his advantage. Meanwhile, London likes a boy so she pretends to be poor for him to like her.

Zack has to take on the responsibility of taking care of Carey and Cody due to them being ill. Cody uses his illness to his advantage by making Zack his servant. Meanwhile, Mr. Moseby makes an announcement about the "Employee of the Month" and it's employees compete for that title.

Zack and Cody have to repair a wall that they damaged as punishment. London begins attending Maddie's private Catholic school due to her poor grades.

Maddie is having her Sweet 16, and likes to have her party at the Tipton. On that same day, London decides to throw her own bash. Zack ends up trying to figure out what to get Maddie for her special day.

One of Cody's favorite bands is playing a concert at the mall. Cody is tempted to skip school with Zack and Bob, so he can see the band perform. Meanwhile, London meets her new young step-mother.

Zack and Cody's school is putting on the Shakespearean play, "A Midsummer Nights Dream", where Cody tries to keep a certain kiss involving his new girlfriend and Zack from happening, and Zack tries to get a girl. London uses the principles of feng shui as she redecorates the Tipton.

Cody, is having difficulty dealing with the fact that Carey has a new boyfriend. But, Zack and Kurt do not have a problem with him because he is rich. London joins Maddie's volleyball team and ends up being rather good- but only when she is mad.

Zack and Cody go on a double date to a miniature golf course. Zack tries to impress his date, Ella, but things backfire on him. Cody and his date, Barbara Brownstein, have an intellectual attraction. London joins a bookclub with her rich friends much to Maddie's amazement. Carey tries to become a more healthy-living person.

Maddie runs a Daycare Service at the Tipton, and when Maddie has a family obligation to attend to, Zack and Cody take over. Meanwhile, London encourages Mr. Moseby to take yoga to help him relax a bit more.

A food critic is coming to the Tipton Hotel. Cody ends up having to fulfill the duties of being head chef, after the Tipton's regular chef suddenly quits, on a very important day.

The boys end up trying to save a horse, which is no easy task trying to keep it hidden. Maddie loans something that is very sentimental to her to London and is mad at her when London loses it.

Cody is disappointed when he finds out that Zack is doing better than him in woodshop at school. London takes credit for a book that Maddie wrote.

Arwin could win a trophy and a kiss from Carey, if he ends up winning an annual competition for "Hotel Engineers"; in which the boys help Arwin train and compete. Maddie ends up getting hired by London to work at her new boutique.

A hotel guest trips on Zack's skateboard in the lobby. But when the boys find out that's he's lying in order to get free service, they come up with a plan in order to set things straight.

Mr. Moseby schedules a ballroom dancing competition at the Tipton to help raise money for Esteban's sister's quinceañera.

Zack and Cody convince Mr. Moseby to open a club for kids in the hotel's lounge in which they would manage. London has her own line of cosmetics in which she needs help coming up with a name for it.

Zack receives help for a history report from Mr. Moseby's grandmother, when she comes to visit. Meanwhile, Mr. Tipton forces London to get a job.

When the Tipton holds Health and Fitness week, everyone begins to examine their eating habits. Cody helps Chef Paolo in an attempt to lower his cholesterol, while Carey begins to limit Zack’s sugar intake. Meanwhile, London and Maddie participate in a charity fashion show where they are both criticized about their looks, each taking drastic measures to change.

When Zack and Cody knock an ancient mummy over the balcony, Zack dresses Cody up to replace it for the exhibit. Esteban is scared of the curse of the mummy, so he and Maddie try to swap the mummy for Maddie's old doll.

Zack and Cody are not happy about their career aptitude tests. London gets jealous of Maddie when she saves the Moroccan ambassador's life and gets on television.

Zack and Cody fall for a French girl who can't speak English very well. Meanwhile, somebody steals London's purse and Esteban tries to help.