In a bleak, postnuclear future world, warring factions struggle to claim the Equalizer 2000, the one weapon powerful enough to guarantee survival.
The plot concerns a unit of US marines operating in the Vietnam war during 1970, with the movie opening on a raid in a village. After massacring the villagers, the marines steal the villages gold, much to the objection of their Vietnamese translator and guide. Skip forward past the credits sequence; it's now 15 years later, and members of the unit are getting murdered one by one. This leads to the former head of the group, now a high ranking military officer, announcing that the only person who is up to the job of finding out the identity of the killer is an Aussie, Major Brad Cooper.
The planet Jupiter has moved closer to the Earth causing an increased gravitation pull which affects the human brain, and people with certain blood types in higher elevations. The result is that the citizens in a town in the Rocky Mountains have become blood-hungry, flesh-eating, and insane.
A young Jewish man is torn between tradition and individuality when his old-fashioned family objects to his career as a jazz singer.