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.

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.

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.

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.

Cody runs for class president; Zack decides to run as well, but for the wrong reason. Mr. Moseby gets annoyed with one of the staff members.

Mr. Moseby gets worried when his older brother Spencer arrives at the Tipton for a visit. Zack and Cody buy a bike, but they have to share it. Maddie and Esteban mess with London's horoscope.

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.

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.

A twins convention is being held at the Tipton Hotel. Zack ends up creating a double date with twin sisters, for him and Cody. London and Maddie end up enjoying a evening with twin brothers.

Zack borrows money from a guest named Maynard to play video games, but starts to fear him when he can't pay it back. Cody enters a spelling bee. London and Maddie help a homeless family.

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 makes a new rich friend, who is mean to Cody and thinks he is a dork. Maddie and London have to do a parenting project for school as partners.

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.

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.

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.

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.

Cody gets Zack a job at the school newspaper for the advice column since the previous person quits. When a girl he likes asks for advice, Zack tells her secretly to ask him out. So she does. But when she finds out about him giving the advice, Zack is in for a load of trouble. London can't sleep and Maddie, Mr. Moseby & Esteban try to help her sleep.

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.

It's International Day at Zack and Cody's school and Zack decides to ask a guest named Kumiko, a Japanese opera singer, to be his project. After Zack loses Kumiko, Carey and the boys must fill in as Japanese singers for a convention being held at the Tipton. Meanwhile, Maddie and London get trapped in London's closet.

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.

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

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.