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.

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.

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.