After being framed by corrupt superiors and brutally assaulted in prison, Officer Matt Cordell teams up with a vicious serial killer to track down those that wronged him.

Innocent people are brutally killed on the streets of New York by a uniformed police officer. A young cop, Jack Forrest, finds himself marked as the chief suspect after his wife is murdered.

When Kate Sullivan storms a hostage situation, the whole incident is captured on tape by an unscrupulous media crew who edit the footage to show her killing a helpless victim. "Maniac Cop" takes it upon himself to exact revenge upon those who smeared her name.