Accepting a wager from snooty Pi Nu president Harlan, Zipper unwisely bets his entire tuition that he can lure beautiful sorority girl Suzi Cooper into his bedroom by midnight. As the deadline approaches, Zipper's buddy Checko devises a plan to help his friend win the bet.
Scrambling to find Zipper a date for the Valentine's Day dance, the Pi Nu brothers settle on Seymour's overweight sister Marilyn, who is visiting for the weekend. As a prank, Harlan arranges for Zipper to be crowned "King of Hearts" at the dance.
When Zipper's father arrives on campus for a visit, Checko and Ronald conspire to trick him into believing that his son is a model student. Since Harlan is out of town, Zipper attempts to pose as president of the fraternity.
En route to Florida for spring break, Checko, Ronald and Zipper end up stranded at a seedy roadside diner when their car breaks down. They are shocked to discover the snobbish Mary Lee working as a waitress.