A traffic police officer gets demoted to being a high school teacher. He goes undercover to stop terrorists who are planning an attack at an international school. Along the way, he deals with love interests, unruly students, and the pressures of being a teacher.

When a hard-nosed police officer goes undercover as a high school student to investigate a weapons smuggling ring, he must contend with school bullies, cheating on tests, and even falling in love. Hilarity and action ensue as he fights crime both inside and outside the classroom.

In Fight Back to School 3 (1993), an undercover cop must go undercover as a school teacher to solve a murder case. He faces various challenges and comedic situations as he tries to maintain his cover and find the murderer within the school.