Zack and his friends have gotten their quarterly report cards and their respective parents have gotten everyone presents for a job well done. However, when Lisa goes overboard with her father's credit card at the mall, she and her friends take some drastic measures to pay Mr. Turtle back for all the money Lisa spent, including getting a job at the Max.

Zack enlists the help of Screech in the bugging of Jessie's room when she invites Lisa, Kelly, and some friends over for a slumber party, with the hopes of finding out who Kelly plans on asking to an upcoming dance. When the girls find out what Zack did, they decide to get even.