In post-apocalyptic New York City a policeman infiltrates the Bronx which has become a battleground for several murderous street gangs.

An American narcotics agent is murdered in Italy. The head of the department decides to hire Larry Stanziani, 'The Cobra'. Larry, a former agent and now a third-rate private detective, uses the opportunity to get even with an old enemy, but soon he finds out he's facing a relentless organization

Drug use in the city of Rome is at an all-time high. Children score from dealers in front of their schools, mules waltz straight through airport security, and Interpol's main man, Mike Hamilton (David Hemmings), is at his wits' end. Fed up to the back teeth with the local police force's incompetence, his only hope is to rely on one of his own men, Fabio (Fabio Testi), an officer so deep undercover that no-one but Hamilton knows who he really is. Even as Fabio gains the trust of cartel leader Gianni (John Loffredo), however, the dealers are edging ever closer to the truth, and when his cover is blown, the hunter becomes the hunted as Fabio finds himself alone in a desperate fight to survive.

Half-breed Keoma returns to his border hometown after service in the Civil War and finds it under the control of Caldwell, an ex-Confederate raider, and his vicious gang of thugs. To make matters worse, Keoma's three half-brothers have joined forces with Caldwell, and make it painfully clear that his return is an unwelcome one. Determined to break Caldwell and his brothers' grip on the town, Keoma partners with his father's former ranch hand to exact violent revenge.

Nico Palmieri is a police inspector who battles a criminal gang terrorizing a sleepy Italian town, extorting cash from the local merchants. With the threat of violence, no one dares to act, except for a restaurant owner who is forced by Palmieri to tell the truth.

Black Jack Murphy is the brains in an outfit of outlaws who rob the bank at Tusca City. All goes to plan with the heist but once the loot is safely obtained Jack's men lose no time in trying to double cross him. Wily Jack manages to outfox them at first and gets away with the cash but they soon catch up with him again and not only make off with the money but leave him crippled and carrying multiple causes for wanting revenge. This need for amends possesses Jack with an all consuming passion and he sets out to get even with each of his unfaithful former compadres but has his particular sights set on Indian Joe and Sanchez who abused and killed his beloved sister.