Jessie turns to caffeine pills to keep up with her studies and her new singing group, Hot Sundae.

Zack begins dating a college girl named Danielle, and asks Screech to make fake IDs in order that they can hang out with her at a club. However, things become complicated when the guys see Kelly's boyfriend, Jeff, there with another girl.

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.

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.

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, Slater, Screech, Kelly and Jessie are working at the mall for the holidays, where they befriend a homeless man and his daughter.

As graduation approaches, Zack learns that he is just one credit short of graduating. Desperate to get extra credit, he joins Bayside's ballet company, and when illness strikes some of the other cast members, he calls on the gang for help.

Zack learns that his new girlfriend is the homeless man's daughter. When she decides to get her dad a new coat and it turns up missing, her boss Mr. Moody accuses her of stealing it.

The gang wins a mystery weekend at a mansion where they are all part of a murder mystery.

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.

Zack asks Kelly to be his date for the prom and she agrees, but when her father loses his job, she decides family is more important and gives up her chance to go, but cannot bring herself to tell Zack.

Mr. Belding's brother, Rod, a substitute teacher, arrives at Bayside to take the gang's History class. Rod proves instantly popular, and soon Mr. Belding is dismayed to find that the kids prefer his brother to him.

Jessie's new stepbrother moves in from New York where he has tricks of his own, including blackmailing her friends.

Zach finds $5000 in the mall, and plans to use the money to buy and then scalp tickets for a U2 concert.

The gang learn about the dangers of drinking and driving when, after getting drunk at a party, they get into an accident in Lisa's mother's car and try to cover it up.

After Lisa and Eric crashes Mr. Belding's car, Zack and the boys must find a way to repair the car before Belding returns; meanwhile Jessie still disapproves of Eric hanging out with Lisa.

A famous film star comes to Bayside to shoot an anti-drug public service announcement. The gang are enchanted by him, but when they go to a party at his house, they discover he is a hypocrite.

The gang begin their senior year, but rather than it being a positive time, things turn sour when Zack and Slater clash over the new girl at school.

Slater is horrified when his girlfriend from Germany arrives at Bayside as a new student. Zack helps hide the relationship from Jessie, but it is only a matter of time before she finds out, and Slater must figure out where his heart lies.

While putting up the new field goal post, oil is discovered. Soon the entire school is interested in the oil drilling, but Jessie doesn't like the idea.

The school holds a dance-date auction to pay for new cheerleading uniforms, where Zach, Slater and Screech are up for auction. Jessie is appalled at the whole idea. Lisa becomes an intellectual to impress a smart boy.

Jessie's self-esteem takes a dive when she gets 1200 on the SAT's, while Zach gets 1502, and her chances to get into "Stansbury" College are hurt, so Zach hires James to help.

As the senior prom approaches, Zack discovers he still has feelings for Kelly. However, she already has a date, and Zack resorts to skulduggery to win her hand, while romance brews elsewhere.