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.
In order to avoid detention, Zack agrees to take part in a pilot program organized by the California Cadet Corps, but Army life proves to be much more difficult than he imagined.
The gang unearths Bayside's old school radio station and begins broadcasting again, before learning that The Max is to be closed if Max does not manage to pay $10,000 in back rent.
Zack stays over at Screech's place for the weekend where the two of them along with Slater throw a party which is interrupted by the girls before breaking off a valuable item from Mrs. Powers.
When Mr. Belding tells Zack that he would like to see his father to discuss his bad grades, Zack hires an actor to play his father. However, things soon become complicated.
After a heated debate about the school calenders, a photographer decides to use Jessie, Lisa and Kelly in a photo shoot where Kelly is chosen as the winner of a contest that'll make her famous in France.
In an attempt to make money, Zack sets up a 900 number hotline, with Lisa offering advice to the students of Bayside. However, things go awry when Zack decides to keep the line running by dishing out bad advice.
After Zack breaks the school's video camera, he and the gang pretend Screech is an alien in order to win a photo competition. However, their picture soon arouses government suspicion.
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.
A.C. Slater and Jessie are finally a couple, but messes it up by disagreeing about how they will celebrate their coupledom, football versus ballet. Zach makes all the wrong moves by getting jealous of Kelly going out with an ex-boyfriend. After a fight breaks out at school, Mr. Belding tries to set the example of how couples should communicate, and after failing miserably, sides with the boys. Neither the guys or the girls want to be the first to apologize, but are miserable without their counterparts. Can Slater and Zach make up for their shortcomings to their girls before it's too late?
After finding out that Bayside's glee club will travel to Hawaii if they reach the finals of a nationwide competition, Zack signs up, and convinces the rest of the gang to join him.
