When an inner-city Miami schoolteacher gets her knee broken after standing up to the school's gang leader, her mercenary combat specialist boyfriend goes undercover as a substitute teacher to take down the punk. Soon he discovers a conspiracy of criminals at work, and must reassemble his team from his last jungle raid to stop them.

When teacher Randall Thomasson is killed during a carjacking, an unexpected visitor shows up at his funeral - his estranged brother, Karl Thomasson. An ex-Green Beret turned mercenary, Karl signs on as a new substitute teacher in order to investigate Randall's murder.

At a college visit to a war buddy's professor daughter, mercenary Treat Williams finds her brutally beaten. He then poses as a teacher to teach a lesson to the football jocks responsible.

A former mercenary joins a military academy as a teacher. He soon discovers a neo-Nazi group, code-named Werewolves, formed among the cadets. He also quickly finds that they have military leadership among the officers at the Academy.