The tabloids report London doesn't know how to swim, so she takes swimming lessons. Zack has been offered to work at the hotel as a plumber or to work at a local market.

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.

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.

Zack gets a job at the minimart, but has to deal with Cody bossing him around. Meanwhile, London doesn't know how to present Lance to her friends.

Maddie, Cody and Zack compete to get the best guest for London's online chat show. Luckily, The Cheetah Girls and Chris Brown are staying at the Tipton, but who will end up winning the competition?

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.

It's the first day of high school for Zack and Cody. For the first time, London has to attend public school.

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 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.

Maddie is back and is not getting along with Nia, while Estaban is not getting along with Patrick, and the rest of staff aren't getting along either. So, Mr. Moseby hires a professional to help the team get along. Meanwhile, when Zack causes some customers to leave, he and Cody schedule a bug convention at the Tipton to make it up to Mr. Moseby. However, due to his fear of bugs, he accidentally releases the bugs into the Tipton.

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 and Cody offer to bring their mother on a week-long vacation to the S.S. Tipton, staying in the King Neptune Suite, which overjoys Carey. However, they neglect to tell her that the only way they could afford the vacation is for Carey to be the cruise ship's singer, although Carey soon finds this out herself. Since Carey does not want to work during her vacation, she offers to pay for her room herself, although the only room she can afford is the "Sardine Suite" (storage room). Annoyed by the few privileges she has from this, she finally agrees to sing, although she falls asleep in the sun and gets sunburn, no longer able to perform. Zack and Cody then perform in her place and do a good job, and get an encore. Meanwhile at the Boston Tipton, London is hosting a 24-hour telethon during her "Yay Me!" broadcast, while raising money for the homeless/hungry through phone pledges. However, a blizzard occurs, which prevents any of London's guests for her broadcast to get to the hotel (since the roads have all been closed). Therefore, they are forced to improvise, which include Mr. Moseby jumping through a hoop like a dog, Maddie and London performing a ventriloquist act, and London spinning plates. However, they soon realize that their internet connection has been lost for over twenty three hours and that all their performances had been for nothing. Instead, they decide to give the left-over food from the Tipton to the food shelter once or twice a week.

When a rich, cute guy stays at the Tipton, Zack and Cody help Maddie impress him by making him think she's rich. In the end, the guy finds out Maddie isn't rich but he still likes her.

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.

Zack and Cody try to make friends at school. When word gets out that they live at the Tipton, all of the cool kids hang out with them. In the end, the twins find out who there real friends really are. Meanwhile, Carey is practicing dance moves, while London teaches Maddie how to ask Lance out and Maddie tutors London in Math.

Zack and Cody have two pet rats as a science project. Mr. Moseby gives the twins tickets to a Red Sox's game to get them away from the hotel. Then a hotel inspector seizes control of the Tipton, because of Zack's mistake. London has a dog party for Ivana and Maddie has to plan.

After two struggling television writers take inspiration from the Tipton, the gang is flown out to L.A. to serve as consultants on the new show. After the "Zack" & "Cody" actors don't pan out, the twins end up cast as themselves.

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 and Cody wish for superhero powers when they see a shooting star. Their wish comes true and they learn that Mr. Moseby is their villain, who wants to turn all kids into miniature adults.

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.

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.

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

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 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.

When Zack and Cody invite Arwin over for dinner he won't seem to leave. Carey is getting annoyed at him so she forces Zack and Cody to make him go. Meanwhile, Lance dumps London and she wants to find a way to get back with him.

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.

Raven Baxter is stuck in Boston, where she has a vision that something bad will happen to Cody. After warning him, vaguely, he becomes paranoid. Meanwhile, Maddie tries to get London into wearing Raven's dress, but London is too stuck up to do so, until pop star Hannah Montana arrives at the Tipton, and wants to wear the dress herself. The crossover starts on That's So Raven S04E11 Checkin' Out (I). It continues on Hannah Montana S01E12 On the Road Again (III)

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.

Cody is inspired by a guest speaker and tries to do the same with his friends - to hilarious results. Meanwhile London and Maddie compete savagely in the fashion shootout of the year to get on the cover of Teen Trends.

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.

Zack and Cody befriend Travis, a kid whom they rope into helping them impress their dates. They then bail on Travis and go out with their dates, but lets Travis go with the girls instead. Maddie finds a stranger's phone whom she thinks is her crush (because she and the stranger have many of the same interests, which she found out on the lost phone). At the end, the owner of the phone was an old man, but Maddie takes an interest in the old man's grandson.

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 and Cody each invite a girl over to their dad's empty apartment. Meanwhile, London teaches Esteban how to act rich because his family has seized power in his native country.

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.

A monster-like robot is accidentally released into the hotel, due to the twins. A Halloween party is thrown by London. A typical prank.

Zack tries out for the high school basketball team but realizes there's some stiff competition, the kind he didn't face in middle school, and worse yet, the giant, in-your-face Coach Little (Michael Clarke Duncan). Meanwhile, when they're rejected as cheerleaders, Cody and London form their own cheerleading squad with the help of Mr. Moseby.

Zack and Cody join the Wilderness Scouts with their leader being Mr. Moseby. Cody becomes jealous when Zack turns out to be a better outdoorsman. Meanwhile, London claims that Maddie stole her former boyfriend and both plead Carey for advise on her "relaxing" day.

Zack and Max compete in a dance contest. Cody learns how to do magic. Zack injures himself, and Cody has to take his place in the dance finals. Maddie becomes London's servant after London lends her money.

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.

A competing minimart issues a competition to see who can bag items faster, Zack and Cody accept the challenge. Meanwhile, Mr. Moseby's niece Nia is goofing off with London.

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.

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.

London spreads a rumor she started about Maddie, and Maddie accidentally spreads one about London. Cody wants to look different, because people kept on thinking he was Zack. Cody has Zack fill in for him on an interview, because of a certain problem.

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.

Tony Hawk checks into the Tipton; Maddie and London has a crush on their fencing instructor. While Zack and Cody are doing their science project, the problem is that Cody has a fear of germs, and when Zack makes a mistake when analyzing a germ from the kitchen and thinks it's a toxic type of black mold, the rumor spreads through the hotel and everyone starts panicking. Cody gets over his fear after he realizes that he can't go skateboarding with Tony Hawk wearing an anti-germs suit.

London develops a crush with the son of a rival hotel owner, of which Ilsa is the the manager. Zack and Cody bake cookies to be served at a ball held at the Tipton.

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.

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.

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.

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.

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.

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.