During the Vietnam war, an American soldier gets trapped beind enemy lines. A squad of his buddies sets out to rescue him.
A man tracks down the five outlaws who murdered his brother, all the while being shadowed by a mysterious Pinkerton detective.
A safecracker takes a job where he must go to Istanbul and steal a scepter that once belonged to the god Gilgamesh but is now in the temple of a secret cult.
The environmentalist Jane and her cameraman smuggle onto a tropical island to investigate the activities of the E-Chem plant. They obtain videotape proof that show that instead of decontaminating radioactive waste E-Chem is dumping it into the island's active volcano. But they are spotted and pursued by the company's mercenaries. A mysterious snake venom farmer aids Jane in her flight. They are then witnesses as an alien emerges from the nearby lake and kills all as it heads to the plant, drawn to the nuclear waste.
Gary Hamilton, innocently sentenced to ten years in prison is released. When he comes out he promises himself to seek revenge on the guilty.
An attorney arrives at a castle to settle the estate of its recently deceased owner. The owner's wife and daughter reveal that he was someone who was able to summon the souls of ancient plague victims and, in fact, his spirit was roaming the castle at that very moment. Soon occupants of the castle begin to die off in gruesome, violent ways.