When Kelly can't decide who to enter a dance contest with, Zack or Slater, they have a dance-off to compete for her. When Zack, who admits to Jesse that he can't dance, asks her for lessons, he soon realizes that it's her he wants as a partner. Meanwhile, Screech keeps trying to convince Lisa to be his partner, but she has no desire to go with him. He comes through for her in the end though, when her partner shows his true colors.
When Lisa charges too much on her father's credit card, her friends help her cook up a scheme to sell her belongings so that she can pay back the bill.
When Screech gets struck my lightening and is believed to hold the power of seeing into the future, Zack uses this to his advantage.
When the girls find out that Zack bugged their room in order to find out their secrets, they plan the ultimate revenge against him.
Zack tries to set up a date for Screech, but his plan backfires and he ends up having dress up like a girl and pretend to be his date.
When Slater's father announces that they are to move to Hawaii, Slater must decide whether he wants to leave or stay. Zack, wanting to get rid of his competition, tries to trick Slater into thinking he's not wanted anymore so he'll choose to leave.
When a substitite comes to Bayside High School, the female students develop a crush on him, which bothers Zack and Slater.
When Zack and Screech's plan to sell a new acne cream to their fellow students backfires, it ends up turning the faces of the students who use it maroon, including Kelly's, who is running for Homecoming Queen.
When Zack bets on Slater to win a big upcoming wrestling match, he is in trouble when he finds out that Slater is done with wrestling.
Zack enlists Screech to tutor Kelly, when he finds out that she needs to pass an upcoming science test in order to go to a concert with him. When Screech and Kelly begin spending more time together than he'd expected, it makes him uncomfortable.
For a marketing project, the gang decides to sell friendship bracelets. After many differing views, Kelly, Jesse and Slater quit the team and form a new group selling Buddy Bands, competing directly with Zack, Lisa and Screech.
To give the students at Bayside High a taste of what marriage is like, the students are each given a partner and have to pretend to be married. Zack gets partnered with Kelly, Slater with Jesse and finally Screech with Lisa.
When Jessie is running for school president, Zack runs against her when he overhears a private conversation and learns that the winner gets a free trip to Washington D.C.
When Zack tries to win Kelly's heart through the use of subliminal messages, the plan ends up severely backfiring on him.
Zack's plans of winning over Kelly Kapowski on the first day of high school are foiled when new transfer student, A.C Slater, also competes for her.
An anual prank war against Valley goes awry when Screech gets kidnapped by the rival school.
After Kelly's father loses his job, she decides not to go to the prom anymore, much to Zack's dismay.
After goofing off during a presentation about the Army Cadet Corps, Mr. Belding gives Zack an ultimatum to make Bayside’s unit a success by having a full Cadet class or spend a lot of time in detention. Thinking that the time spent in the Cadet Corps will be easy, Zack decides to recruit Jessie, Kelly, and several of the school’s nerds to participate. After being selected to lead the team of misfits, Zack frustratingly decides to quit the program. It is only after he talks with Belding that Zack decides to go back to his team, hoping they’ll accept him with open arms.
The gang tries to revive the school's radio station, KKTY, and all receive success, but Slater's sports cast. Trying to save the Max from closing, the gang opens an airwave telethon, raising money to help save their favorite hang-out.
While in driving class, Zack, envious of Slater's success, tries to cook up a scheme to get Slater to fail, but it of course ends up backfiring on him.
When Screech’s parents go to Graceland for their anniversary, Zack and Slater talk him into having a “guy’s night” at his place. When the girls decide to crash their night, Mrs. Powers’ prized Elvis statue breaks, leaving Zack to scheming to find a way to raise the money to replace it
Mr. Belding threatens Zack with suspension, unless he agrees to go out on a date with his niece, Penny.
When Zack finds out Mr. Belding wants to meet with his father to discuss his grades, Zack goes on a mission to find a man to pose as his real father.
Zack bets Slater that he guarantees that Screech would win the school beauty pageant. Jessie protests the pageant until she discovers that a male entering would be fair.
With mid-terms swiftly approaching, Jessie starts stressing out due to her less than stellar understanding of Geometry. In an attempt to get her mind off the upcoming test, Kelly and Lisa talk her into joining the singing group Zack started. It is only after her hectic studying and singing schedules that Jessie decides to turn to caffeine pills to get her through her busy schedule, despite the warnings she received from Slater. It is only after Zack finds out about her problem with the pills that Jessie agrees to counseling to overcome her addiction.
When the gang takes over the school store, Zack cooks up a plan in order to try and get more customers.
Kelly's younger sister Nikki secretly crushes on Zack. When Zack, Lisa, and Screech forms an anonymous teen help-line, Zack receives a call from Nikki, who asks for advice, and Kelly, who is suspicious that he and Nikki are dating. When he gets the calls mixed up, he has to figure out how to straighten things out.
In order to raise money to replace the video camera Zack breaks, the gang tries to sell a story to the tabloids about Screech being an alien from another planet.
When Zack fails a History assignment; he risks missing a big track meet against a rival high school as a result. Upon Miss Wentworth arranges for him to meet up with a tutor to help him learn more about Native American heritage. It is with the help of Chief Henry that Zack is able to ace his assignment and participate in the track meet, but when he learns of Henry’s death, Zack becomes reluctant to participate at the event.
When Kelly breaks her arm, Zack is given the responsibility of babysitting her baby brother for the day.
Zack asks Kelly to go steady with him, but soon decides to break it off when he falls for a new girl in school, who happens to be the school nurse. Meanwhile, Slater fears taking a flu shot.
Bayside’s annual Costume Ball is around the corner and Kelly is reluctant to go with Zack, since she is unsure she is able to afford a costume. After finding out that there’s an opening at the Max, Kelly meets Jeff, when she goes for an interview. After being hired provisionally by him, Kelly begins having feelings for Jeff and as a result, a strain is put on her relationship with Zack. Things come to a head at the dance when Kelly accidentally refers to Zack as Jeff, and as a result they share one last dance before breaking up.
With the exception of Lisa, the gang gets jobs at Malibu Sands, a nearby beach club for the summer. Almost immediately Zack gets off on the wrong foot with Mr. Carosi, the owner of the club when he asks to get off early for upcoming birthday. Things get worse for him when he calls Carosi names in front of his daughter Stacey when she arrives at the club looking for him. After some harsh runs in with both Carosi’s, Zack and the gang almost get fired when Lisa decides to have Zack’s surprise birthday party at the club and Mr. Carosi finds out about it.
After Kelly breaks up with him, Zack is so heart broken that his friends try to lift his spirits. However, when he gets set up with Screech’s attractive cousin, Zack’s plan to make Kelly jealous backfires and almost causes him to lose his friends. It isn’t until Screech gives Zack some advice that he is able to move on without Kelly as his girlfriend.
When Mr. Carosi announces that the Malibu Sands employees will be playing in an annual volleyball game with a rival beach club, Zack makes a bet that if they win, Mr. Carosi has to sell him his car. At first it looks like Zack’s team will win easily win the game, thanks to Zack finding a ringer to play on the team. However, when that player gets injured Zack’s dreams of winning the game goes down the drain and leaves the team scrambling to find a suitable replacement that knows how to play volleyball.
When Zack sprains his knee before a big basketball game, he is surprised to find Lisa candy-striping at the hospital he was taken to. After Lisa’s mom runs some tests on his knee, Zack learns that he has to have an operation to fix it. At hearing this, Zack fears that he won’t make it through the surgery and tries to sneak out of the hospital. Meanwhile, Screech makes Mr. Belding feel guilty for causing Zack’s injury.
When the Mr. Carosi announces that the beach club will be holding it annual Fourth of July beauty pageant, Zack is named one of the judges. As a result, Zack promises his vote to several contestants while Mr. Carosi orders him to vote for Stacey or he will be fired.
After seeing a pretty girl walk into the Max, Zack decides to use a school assignment to impress her and get her phone number. While talking, he discovers that Danielle is a college student; he lies about his age so he could meet Danielle and her friends at a nearby dance club. After getting Screech to make some fake I.D.’s so he, Slater and Screech can get into the club, Zack and Slater get more than they bargain for when they find Kelly’s boyfriend Jeff dancing with another girl. However, when they tell Kelly, she refuses to believe their story. It is only she sneaks into the club does Kelly discover the truth and ultimately dumps Jeff.
When Bayside High strikes oil, the school decides to drill oil. Everyone but Jessie is ecstatic until an oil spill kills animals in a pond near the football field.
After returning from her mother’s wedding, Jessie is happily waiting for her new stepbrother to move in. At first she and the rest of the gang at Bayside try to help Eric fit in, but after he starts blackmailing them in order to get his way, things turn ugly, especially after Zack and Slater try to turn the tables on him.
After finding out that Slater and Zack paid Lisa to go on a date with him, Eric decides to get even with them. As a result, he has Coach Sonski’s auto shop class take apart Mr. Belding’s new car so they can get in trouble. However, after Jessie finds out what Eric did, she gives him a piece of her mind before punching him out. It is at this point when he decides to put the car back together for the guys.
When the cheerleaders decide to hold a date/dance auction for new uniforms, Jessie is appalled at the idea of auction off the guys, despite it being for a good cause. However, when the auction is held, several students find themselves with unlikely dates, such as Zack and a heavyset classmate, Jessie and Screech, and Lisa with the smartest guy at school.
The gang finds five thousand dollars in the mall, and decides to camp out at the mall, to guarantee being the first in line to buy tons of U2 concert tickets to sell.
After Zack and his friends’ take their S.A.T.’s one weekend, Jessie becomes panicked after finding out she scored low. Fearing that she now won’t get into her college of choice, Zack decides to hire James to pass as the recruiter from “Stansbury” College to assure Jessie that she’ll have no problem getting in, but when Jessie recognizes James, his plan backfires. Meanwhile Zack is in for a surprise when he finds out how high his S.A.T. score is.
When the gang goes to Palm Springs for Jessie's father's wedding, Jessie has problems with her dad marrying a much younger woman. Meanwhile, Slater encounters romance with a girl who turns out to be a princess, and Zack and Kelly struggles with whether they should get back together or not.
Jessie tries to break up her father's wedding, and Slater has problems being himself with Christina's father. Zack and Kelly discovers that they want to date other people.
When a new girl named Kristi transfers to Bayside, she wants to try out for the wrestling team, but gets turned away by Coach Sonski. Wanting to help her get on the team for different reasons, Zack and Jessie decide to help Kristi in her training. However, they encounter some road blocks when Jessie thinks Slater is hitting on Kristi and when she saves Zack from a bully while on their date at the Max.
Celebrity movie star Johnny Dakota decides to shoot an anti-drug commercial at Bayside High. The gang is star struck by Johnny, but they soon discover that he isn't what he seems like.
Casey Kasem hosts a documentary, where the gang's band hits big time, but soon splits up when Zack believes that he is the main star.
Zack who can't partake in the schools annual Cut Day due to having too many absenses, tries to find a way to sneak out of all his classes.
In this Christmas tale, Zack meets a young lady at work. However, It later turns out that she and her father are homeless and live in their car.
In this television movie, Kelly's grandfather invites her and her friends to Hawaii, to stay at his hotel, "The Hideaway." When they find out it's in danger of being closed down for good, they pull out all the stops to help the hotel become the success it once was.
Zack and Kelly are finally getting married. But of course, problems are ahead. Zack's parents are against them getting married, and Kelly's parents cannot afford it. So the gang travels to Las Vegas to marry Zack and Kelly. They go through many adventures such as Zack losing all his oney, Slater and his new friend being chased by mobsters, and Kelly cancelling the wedding.
Zack and Slater fight over an attractive new transfer student.
For a school project, the students are given a little more authority, as Kelly is made a history teacher and Zack, principal of the school.
The gang tries to make money by selling Screech's Spaghetti Sauce. Screech falls for Robin, a girl who tries to take advantage of Screech's money.
When a new girl, Tori, comes to Bayside High School, she and Zack immediately clash with each other. They then must get over their differences when they are paired up for a school project.
Screech gets angry when he notices that Lisa and Zack have become more than friends while working on a fashion show together.
When the gang takes part in the school's teen-help line, Zack begins to get close to a handicapped girl he meets. He treats her differently than everyone else because of this, when that's the last thing she wants.
With the schools masquerade ball approaching, Slater and Zack make a bet to see who can kiss Tori first. Meanwhile, Lisa has a secret admirer which of course ends up leading to misunderstandings.
When Zack tries to sneak out of detention to try and win a trip to Hawaii, he asks the gang to get involved, and ends up winning them all detentions as well.
Everyone is concered with their future, as Slater and his father debate where he should attend college, and Jessie becomes a cheerleader to beef up her college applications.
The gang learns a lesson about the dangers of drinking and driving the hard way, when a careless mistake gets them into a car accident.
When Slater’s ex-girlfriend surprises him by transferring to Bayside High, Jessie gets worried that they still have feelings for one another. Wanting to show Jessie that there is nothing between them; Slater decides sets Zack up with Jennifer. However, when it looks like they’re hitting it off, Slater becomes jealous and thanks to Screech’s “love machine,” his true feelings are revealed to Jessie.
Zack is in charge of buying the class rings for the entire senior class of Bayside High. After learning that the salesman who sold him in the rings is a crook and gave them fakes, the gang must come up with a plan to get the real rings out of him.
On Valentines Day, the gang looks back and reminisces about their past relationships and love mishaps.
When a former Bayside High student dies and leaves $10,000 dollars in his will to be donated to the school, it's an all out battle of the sexes as the students must compete against eachother to determine how the money will be spent.
When Zack and his friends get the teachers to call a strike so they can go on a trip, they discover that their scheme hurt Bayside’s chances of winning a big academic championship.
When Slater notices that his visiting sister, JB, and Zack are falling for each other, he tries to put a stop to it immediately. Meanwhile, Mr. Belding holds a male sensitivity seminar at the school.
The gang tries to raise enough money in order to have their senior prom and Zack tries desperately to get Kelly to go with him.
When his friends forget his birthday, they try to throw him a late surprise party. Screech, upset that his friends didn't remember, takes advantage of his new hall monitor position and makes it difficult for them to plan it.
When the drama club discusses what play to put on for its upcoming production, Screech suggests they do a hip-hop version of Snow White and the Seven Dwarfs. After everybody gets cast in their respective roles, Jessie and Zack face a problem of having to kiss in the final scene, especially after Lisa catches them practice their kiss and lets it known to Kelly and Slater that they possibly like one another.
During an earthquake, Zack and Tori find themselves trapped in an elevator with Mr. Belding's wife who is going into labor.
In this retrospective episode, Zack and his friends reminisce about their summer at Malibu Sands.
When Slater's lizzard friend Artie dies, the gang tries to keep Slater from finding out.
When the school holds a competition for the Bayside High students to come up with a new school song, Zack is determined to get his song to win by any means possible.
It turns out that before graduating, our favorite high school gang wanted to leave behind a piece of their Bayside legacy to share with future generations.
In the year 2003, a group of Bayside High students view a time capsule video made by Zack, Kelly, Slater, Jessie, Screech and Lisa in the year 1993. The video shares the gang's various experiences at Bayside High School.
As Graduation Day approaches, Zack finds out he's lacking in the credit department and is therefore unable to graduate. Meanwhile, Jessie is determined to become class valedictorian and Screech comes through for a good friend one final time.