Mr. Belding pairs up Kelly and Zack, Jessie and Slater, and Screech and Lisa in a class assignment where they spend the week as married couples. When things don't go as Zack, Slater, and Screech plans, Mr. Belding changes things up to see how the students adjust to his curveball.

When their teacher Miss Wentworth spends some time in class talking about how subliminal advertising works in the business world, Zack decides to use it to his advantage by getting out trouble with Mr. Belding, and by getting Kelly to ask him out to Bayside's Sweetheart dance. However, when Kelly, Jessie, and Lisa find out what he did, they turn to Miss Wentworth for help in formulating a plan to get back at him.