When the twins find out about a ghost in Suite 613, Zack will stop at nothing to meet the ghost. With some help from Maddie and London, the twins come face to face with the ghost of Irene.

Maddie has her prom at the Tipton Hotel after realizing there is nowhere else to have it. Zack thinks that he will be her date, but ends up getting dissapointed. Cody starts to act like a mime.

When the twins get grounded for running around in the hotel, they try to take a picture of a $20,000 kiss so that they will no longer be considered burdens.

London's father goes broke due to an investment in a diamond mine. London now has to move in with Maddie. Zack and Cody wonder if their parents ever got them mixed up when they were babies.

A beauty pageant comes to the Tipton Hotel. Cody ends up becoming a contestant, because of a girl he likes to meet. Zack wants him to win, so they could use the prize money for new bikes.

Cody ends up going away to camp. Zack starts to miss him, and has to find a way to get to him. London ends up learning how to drive, with the aid of Mr. Moseby.

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.

London (even though she can't sing or dance) gets the role of Sharpay in their school production of High School Musical instead of Maddie because Mr. Tipton is financing the director's play "Floss" on Broadway. Zack has to work backstage for detention and Cody gets the part of Troy.

Zack, Cody, and the entire gang get snowed in at the Tipton. Maddie rigs a "secret santa" bowl so that London will get her a gift.

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.

When the twins find out about hidden treasure in the Tipton, everyone goes into a frenzy looking for the money.

The Tipton shoots a commercial. The director happens to be a date of Carey's from 15 years ago whom she left in the middle of the date. He prevents Carey from trying out for the commercial—but in the end, Carey and the twins end up being in the commercial.

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.

The news of a visit from Mr. Tipton gets the employees excited (and reminiscing) about their good deeds as to who deserves a possible bonus… but when they find out Mr. Tipton is in a bad mood and will fire someone, all fingers point to Carey because of the boys' mishaps, but Zack & Cody come up with a plan.

There is a Battle of the Bands competition being held at the Tipton Hotel. Zack and Cody, along with Max and Tapeworm compete against Maddie's band in which has London in the band.

There are a couple of jewel thieves in the Tipton Hotel. Zack and Cody have to try and find out who it is to clear up someones name.

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.

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.

Cody is graduating from 8th grade as class valedictorian. But Zack is horrified to learn that he has to attend summer school and tries to hide it from his parents. Meanwhile, Maddie becomes a camp counselor at a run down facility with less than ideal girls under her wing.

Cody searches for a summer job, and finds a "help wanted" sign at the local mini-mart. When the owner realizes Cody is friends with London, he will only hire Cody if he will set him up on a date with her. Zack discovers he is the smartest student in his summer-school class, all the other kids make fun of him.

Zack and Cody rent out London's Suite while she is out of town so that Stacie, a cute girl from school can have a sleepover birthday party at the hotel.