Just as Zack and Kelly are getting pretty close, Kelly is accepted to the Semester on the Sea program, which involves a three-month cruise. Zack doesn't want Kelly to go, but she feels it's an opportunity she can't pass up. Zack tries to get accepted into the program as well, but none of his schemes work. He tries to get Screech to quit the program by scaring him, but that backfires.
Zack has a dream that Kelly is with another guy on the ship. When he wakes up, he goes into Kelly's room, wakes her up, and asks her to marry him. Kelly says she has to think about it--and she's still going on the cruise.
Meanwhile, Alex and Slater are finding that they don't have anything in common. Slater wants Alex to do something he likes for a change, which is to go to a car show with him. She refuses. Another girl overhears and offers to go with Slater instead. Leslie finds out that Slater is seeing another girl, and she eventually forces him to tell Alex about it. Alex is hurt, but in the end they decide to part as friends.
As Screech is getting ready to leave, Zack tries to make up with him by giving him a book as a gift, which Screech accepts. Zack is still angry with Kelly and refuses to go and see her off. However, just as the ship is getting ready to sail, Zack shows up with flowers for Kelly to say goodbye "the right way." Kelly suddenly decides she wants to marry Zack right away. They run off the ship just before it sails.moreless
Zack begins dating a tennis star, Linda. He is at least partly intrigued by her fame. She is struggling with astronomy so Zack gets Screech to tutor her. Linda continues to date Zack, but she and Screech are enjoying their time together. Zack notices and he and Screech have an argument about it. Screech temporarily moves in with Mike and drives him crazy.
Meanwhile, the girls decide to have a party to attract a more intellectual crowd--especially men. The party doesn't turn out as they had hoped. Zack is there with Linda, thoroughly enjoying the way everyone else reacts to her.
Screech is with Mike who convinces him to go and tell Linda how he feels--right away. Screech shows up at the party wearing his pajamas and a nightcap--and looking ridiculous. Linda seems to put him off, but after Screech leaves, Zack talks to Linda. He tells her that Screech really likes her--probably more than he does himself--and that she should choose Screech. Linda tells Zack that she already has, and she leaves to find Screech.
Screech comes back to the dorm room he shares with Zack and Slater. Zack and Screech make up and all are friends again.moreless
Leslie's Parents: It's homecoming weekend. Leslie's parents come to visit her. She is sick of their controlling ways, so she asks Screech to be her date in order to freak them out a bit. Screech agrees to be especially geeky for this event. He does a good job of freaking them out, but eventually they figure it out and they agree to back off and allow Leslie to make some of her own decisions from now on.
Johnny: Meanwhile, an old football buddy of Mike's is also coming. Kelly has a crush on him and Slater admires him. Zack is not that impressed, but Johnny (Mike's friend)charms him and offers to get him in to the party and introduce him to some big wigs. He also invites Zack to play golf with him the next day. At the party, Johnny asks Kelly to go with him. Kelly was Zack's date, but Zack hardly even notices because he is so busy talking to the people Johnny introduced him to. Kelly leaves with Johnny. The next day, as Zack is getting ready to go golfing, Kelly tells him that Johnny hit on her. When she said no, he let her find her own way home. Zack decides not to go golfing after all.
Mike, who had warned Zack about Johnny, admits to Zack that he is a bit jealous of Johnny's fame and the fact that he's still playing football. Zack lets Mike know how much help he's been and how much the kids there need him.
The Mascot: Alex is auditioning for the coveted role of the school mascot, a falcon. As she is practicing her falcon role, Slater walks in and teases her. She gets offended so later on, he helps her by giving her some advice--and she gets the job. She invites Slater to go to the party with her and he accepts, however, he was not expecting her to show up in her falcon costume. Slater is very embarrassed and Alex gets hurt. In the end, Slater tells her he really likes her.moreless