
Slaughter (Jim Brown), a fierce Vietnam veteran and ex-Green Beret, had avenged the death of his parents by killing the gangster who was responsible for their death in Mexico. He is now relocated in Los Angeles, California, a place that Slaughter sought to escape the past events and begin his attempt to have a tranquil life. Slaughter goes to a friend's house for a lavish outdoor picnic and celebration. Meanwhile, a new crime boss, Duncan (Ed McMahon), is now after Slaughter, for having killed ex Mafia boss Dominic Hoffo earlier. An old World War I biplane is seen flying by the outdoor celebration and then opening fire on the guests at the picnic. It results in the graphic death by headshot of Slaughter's friend, which reignites the old spark of fury and rage that Slaughter had when told of the death of his parents.