Lovable schemer Zack Morris leads his pals on adventures at California's Bayside High School. The friends navigate relationships, final exams, school dances, breakups and more while frequently frustrating their principal, Mr. Richard Belding, who does his best to keep them in check.
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.
After Screech gets struck by lightning, he gains the ability to see into the future, and Zack uses him to cheat on a mid term exam.
In an attempt to find out who Kelly wants to take to a dance, Zack and Screech bug the girls' sleepover party and the girls get revenge.
In an attempt to cheer Screech up enough to complete their science project, Zack pretends to know a girl who is interested in Screech, but things soon become complicated.
When his father is offered a transfer to Hawaii, Slater must decide whether to move there or stay at Bayside, and Zack takes full advantage of the situation.
After the school's drama teacher falls ill, a handsome substitute arrives, and quickly captivates the girls, much to the chagrin of the boys.
When Screech accidentally invents a seemingly miraculous zit cream, Zack sells it at school. However, it soon becomes clear that the cream has an alarming side effect.
During Career Week at school, Slater worries that continuing to focus on wrestling will not lead to a successful job. As a result, he quits the sport, worrying Zack, who has bet on Slater winning his next match.
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.
As part of an assignment for Business class, the gang forms a friendship bracelet company, but infighting soon leads to trouble and defection.
As part of a class project, Zack and Kelly, Slater and Jessie, and Screech and Lisa are paired up in mock marriages.
When Zack finds out that the elected student council president gets to leave school for a trip to Washington D.C., he runs against Jessie.
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.
When Bayside's rival school, Valley, revives the schools' ongoing prank war, the gang tries to get even.
Mark-Paul Gosselaar
Zack Morris
Mario López
A.C. Slater
Dustin Diamond
Samuel 'Screech' Powers
Lark Voorhies
Lisa Turtle
Dennis Haskins
Richard Belding
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