Sabrina Masterson is a conceited and wealthy teenager who is sent by her own mother to college to live at Alpha Beta Pi, a sorority house, because she could not handle her anymore, explaining she was too evil.

Upon her arrival, she is welcomed by everyone and assigned as the roommate of Rita Summers, the sorority president and most adored and popular girl.

Sabrina soon takes an interest in her boyfriend Mort, who owns a bar at the beach, near the sorority house, and will soon enroll into medical school, hoping to become a doctor.

She soon starts taking it out on Rita and her friends Tina and Ellie, often embarrassing them or making catty remarks without directly confronting or insulting them.

In spite of that, Rita still tries to befriend Sabrina and tells her about her bad relationship with her mother, explaining that she is often too busy to talk to her.

She tells Sabrina that she wants her to be more like her older sister Julia, who was once the sorority president, and terminates her allowance because of breaking a rule.

Later that day, Sabrina and Ellie overhear Tina announcing that she is pregnant of her boyfriend Jimmy, who she secretly sees.

Later that night, she blackmails Rita to give up her title as sorority president, threatening to reveal that her mother is in jail if she does not.

Sabrina later witnesses Mort being rejected by Rita when he tries to sleep with her, and she thinks she can profit from that information to win him back.