Ryan has to deal with Rachel staying in Boston and later breaking up with him. Liz is bothered by Maria and Katie constantly comparing her to Rachel.

Maria starts smoking marijuana and Screech is fearing for his job as Eric fills in for him while he's sick. Maria and Nicky are looking at the end of their relationship.

Eric starts getting moody when he stops getting enough sleep.

As a class project, some of the Bayside students try their hand at operating the Max, but they nearly run it out of business. Then Scott takes over the management, much to Vicki's happiness.

The Bayside girls swim team is undefeated thanks to nationally ranked team captain Liz and new recruit Katie, but the boys team featuring Nicky and team captain Ryan is sinking fast. Eric has his eye on Shauna Elliot, a member of the girls team. After losing a meet against Westwood, The boys think they have no chance of beating Valley. So Eric decides to switch places with Maria so both can cover the swim teams for the school radio station. With the state finals coming up, Liz asks Screech for extra time in the pool. Screech tells the boys that their practice time will be cut to give the girls have a better chance of beating Valley. Katie has an idea on how to solve this conflict and Screech presents it to the girls team. At the other end, Maria is covering the boys team while Eric covers the girls. Ryan and Nicky play a phone prank on the girls, pretending that NBC Sports is doing a story on the girls. The prank ends up with Liz and the rest of the girls getting detention while th

Katie and Eric begin taking all-natural herbal stimulants to help them keep up with the long hours they've been working, but after offering the herbs to a customer who passes out from over-exhaustion, they quickly learn about the little-known side effects of the drugs. Meanwhile, Maria becomes jealous when her ex-boyfriend Nicky starts dating Courtney, But she goes too far when convinces mall security guard Screech that Courtney is the thief that Screech has been looking for.

The students are depressed about Bayside's closing and can't get very excited about the prom. Mr. McMillan shows up and says he now plans to tear down the school even before the prom is held. Desperate to stop him, Rachel is disguised as ""Nurse McGillicuddy"" and the kids fake an outbreak of ""Swiss measles,"" for which a phony quarantine is set up. The prom is back on. The gang finds out that Mr. McMillan was a lonely guy at Bayside, with only one friend, a girl named Sandy Bennett. They locate Ms. Bennett but she can't come to Bayside's 40th prom because of a previous engagement with her nephew. The prom has a 1959 theme. Former Bayside High students Lisa Turtle and A.C. Slater show up, then Zack Morris arrives with Ms. Bennett, who it turns out is his aunt. McMillan is reunited with his old friend and she convinces him to abandon his plans to tear down Bayside.

Eric and Maria invent a spray that will help restore the life in shirts. Eric decides to sell it without testing for side effects that the spray causes.

Maria will do anything to help her younger brother Tino find a job at the mall, and gets him work with her at the Teen Machine. But when his irresponsible behavior causes both of them to lose their jobs she has to stop making excuses for his actions. Meanwhile, Screech finds it difficult to hold down two jobs--mall security guard and assistant to Mr. Belding--and is forced to give up one. Also, Ryan and Eric enter a contest to win a jet ski, but realize the only way for them to win is by cheating.

Ryan and Nicky still don't know which of them will wind up as Liz's boyfriend. When Ryan brings Liz lunch, Nicky interrupts them, and when Nicky takes ballet lessons with Liz, Ryan does the same thing. The stepbrothers continue to fight it out and Liz still can't decide between the two. Meanwhile, Katie and Eric plan to throw Maria a surprise birthday party for Maria, but the surprise is blown when Maria finds out that Screech and Mr. Belding are going.

After a river rafting trip, Nicky and Katie develop feelings for each other. Katie develops a fear of losing him that alters her behavior.

Chad Westerfield, who has his eye on Megan, and Lindsay are leading candidates for Homecoming King and Queen.

Weasel's pen-pal Natalie comes to Bayside and joins the band, as do Scott and Tommy D, hoping to win a trip.

Katie is reluctant to do something when her boss starts sexually harassing her.

Maria, Tony, Katie, and Nicky are selected to compete for a game show where the couple who knows the most about each other will win a car. But when Maria and Tony are secretly chosen to cheat in order to win the car, they are faced with the decision of deceiving their friends or giving up the car.

While the gang prepares for graduation, Katie and Nicky are forced to break up. As a gift for Mr. Belding for every senior to wear a '68 logo on their gowns honoring Mr. Belding's graduating class, Maria enlists Tony and Eric to pick up the graduation gowns but a little accident occurs when they spill ink all over them.

Scott signs up to get on the air at the school's radio station, hoping to attract the girls. But they all ignore him when they hear Weasel, who is giving advice on love and romance under the name ""Dr. Luv.""

In an effort to make Rachel jealous and stop her from thinking about her missing boyfriend David, Brian begins hanging out with the club's pretty tennis instructor, Karen. Also, the Bayside gang competes in a ""tip-athon,"" the winner of which will get double his or her earnings.

Scott volunteers to babysit for Mr. Belding's son Zack. In order to impress a girl (Ashley), he offers up little Zack for a child modeling job.

Megan's father, Judge Jones, wants his daughter to leave Bayside High and enroll in a private school.

In order to get a car from his father, Tommy D must receive an ""A"" in either physics or speech. The gang pitches in to help him succeed at this seemingly impossible task. Also, Megan finds herself acting like an airhead over a boy.

Screech forgets to mail in Mr. Belding's application to join a prestigious society of principals, so he enlists the help of James the actor to convince Mr. B that he's been accepted. Also, the gang tries to buy the one millionth burger served at the Max so they can win tickets to the MTV Music Awards.

The kids are in the middle of tough mid-term exams. Screech convinces Mr. B. to throw a post-mid-term party for the students but actually it will be a surprise 10th anniversary celebration for him. Ryan, Nicky and Eric get a rude awakening in home economics class--they have to bake a lemon meringue pie for their mid-term grade. The boys buy a pie at the Max and turn it in. They get an ""A"" on it. Screech tastes it and gives them the job of baking a cake, Belding's favorite food, for the big party. Meanwhile Maria blows off studying with Katie and Rachel when Sean Pierce asks her out. Sean asks Maria to help him with his take-home Spanish mid-term. She agrees, despite her study schedule with the other girls. When Maria does study with them, her mind is still on Sean, who calls her up. She leaves to go out with him again. Rachel and Katie think he's using her. The boys plan to raise $150 for a cake, saying it's a gift for Mr. Belding. The girls contribute money, but they want to buy Mr.

The annual Bayside Science Fair is coming up and Screech desperately wants to win. Eric may be the school's only hope for winning with his robot duster invention, but Screech insists on enhancing his creation which could get Eric disqualified from the competition.

Katie is troubled by Bayside High School's plans to honor her scholarly sister, Robin.