Miami 1980, a doctor transplants a metal object into a patients arm. He tells him to go home and relax, but soon the patient kills the doctor. One year later, Prof. Arlington is kidnapped by thugs and taken to a secret location. Awesome action ensues.

The titular "Mad Dog", actually goes under the very anonymous name "Nick Nolte", and is played by Romano Kristoff, whom you may or may not remember from such classics as "Warbus", "Double Edge", or "Tough Cops". He is a cop who doesn't take it easy when the mob executes his stripper-sister, and he goes after them to get revenge at all costs. Another Phillipino superstar, Jim Gaines, has a small cameo in "Mad Dog II" as a snitch who gets offed in the bathroom.

"Evil ninja leader Victor steals the coveted black ninja warrior from Charles but gets wounded in the process. Taking refuge at his friend Roger's house, his authority is challenged by a young man named Jimmy who has come to avenge his father's murder. Victor sends his henchmen after Jimmy, however Charles comes to his aid. Together, the two team up in order to retrieve the black ninja warrior and achieve the ultimate revenge." - VHS Back of the box description. A Hong Kong cut and paste edit of the 1983 Thai Film "เหยี่ยวดง" (Forest Hawk) with new ninja scenes.

Jack Kaplan is a US Army Soldier and Weapons Expert liberated by a "rescue team", he returns home to the United States only to find out that his wife Diane has been captured by infatuated gangster Duffy Collins. Kaplan embarks on a mission to find his wife, running into characters like Digger, Man With The Golden Hand, and the treacherous femme fatale Eve. He is a man on a mission.

Mark, a local cop, is investigating a string of jewel robberies. He soon discovers that the men behind the crimes are the notorious"Red Devil" and his band of Ninjas. Mark teams up with Billy, a man out for revenge.