When John Eastland's best friend, Michael Jefferson, is mugged and left permanently crippled, he decides to do something about it. Jefferson had saved Eastland's life in Vietnam and now it's time for Eastland to avenge his friend's beating. Using his old Army gear he sets out on a crusade to clean up the streets of New York using the name "The Exterminator." He becomes a vigilante hero to the public; but to the police, The Exterminator is a psychopath capable of dangerously undermining an entire government administration.