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.

It's the Homecoming game against Valley and the two schools play their annual round of pranks. Valley steals Screech, the Bayside mascot, who escapes in time for the game.