While working at the Student Health Center Kelly realizes that she'd like to become a doctor, however, Zack discourages her arguing that it would require a lot of effort. After Kelly gets an extra job as a cocktail waitress, she starts to reconsider her choice of studying medicine in favor of taking the easy route and earning quick money from tips. Meanwhile, the guys help Mike prepare for his tryout for a comeback to the NFL.

After car trouble intervenes with their Thanksgiving plans, the gang helps Mike, Leslie, and Screech prepare Thanksgiving dinner for a group of underprivileged kids.

While Screech hides a lab monkey destined for the zoo, Zack discovers Kelly's crush on Professor Lasky.

A jealous Zack strikes back at Kelly and Professor Lasky with a vengeance by spreading the word about their affair, which climaxes at a costume ball. Meanwhile, Rogers gives the rest of the gang papers to fill out on a perfect mate profile for a psychology project, and Screech ends up getting the same mark as Alex.

After a new professor takes over their Ethics class, the gang faces a dilemma when Zack gets his hands on a copy of the midterm. Meanwhile, Screech covers for Slater at the student union, but soon finds out that bussing tables isn't his forte.

With Mike gone and in need of money for a trip to Cancun, Zack and the gang stage a rave in the dorm.