Slater is being courted by an exclusive fraternity while Leslie is being courted by a sorority. Zack really wants to get into the same fraternity as Slater, but they don't seem as interested in him. Zack manages to impress Rick the fraternity guy, but both he and Slater worry that Screech might ruin their chances in being accepted because of his goofiness.

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.

With Kelly still pining over Professor Lasky, Zack tries to find ways of getting her attention and ends up volunteering as an orderly at the health center. Unfortunately, Professor Lasky winds up there as well, and Zack has to come up with one scheme after another to get him out of the way. Meanwhile, Screech tries to fit in with a group of pledges at his fraternity.