During the Vietnam War [1959-1975] a special US combat unit is sent out to hunt and kill the Viet Cong soldiers in a man-to-man combat in the endless tunnels underneath the jungle of Vietnam. Suicide squads of a special kind.

In 18th-century Romania, after spending much of her life in a traveling circus, human-vampire hybrid Rayne escapes and plots to take down her father, Kagan, the evil vampire king. When she's discovered by three vampire hunters, she manages to convince them to spare her life and join her cause. But slaying a vampire as powerful as Kagan will be no easy task.

Jack Carver, a former member of the Special Forces takes the journalist Valerie Cardinal to an Island to visit her uncle Max who is working in a Military complex on the Island. As they arrive Valerie gets captured by the minions of Doctor Krüger. After the destruction of his boat Jack finds out about the true purpose of the Facilities on the Island, which is the creation of genetic soldiers.

The fourth film in the Bill Williamson saga.