John Lloyd

Miami 1980: doctor transplants some sort of metal object into a patient arm. Then tells him to go home and relax but the patient kills the doctor. One year later. Professor Arlington (Mike Monty) is kidnapped by thugs from his pool party and taken into a secret location. Only one of Arlington's bodyguards survives, Mc Pearson (Bruce Baron), he helps the cops to find the professor and locate the kidnappers with some heroes for hire. (imdb)

A boy sees his parents gunned by criminals due to unpaid debts. Twenty years later, the boy, Mark Quinn, has become a hard-hitting cop, the kind that hates criminal scum, bending the rules to catch those criminals and drive them to despair. (The Movie Database)