In the near future Steve takes a job as a tow truck driver that has to battle a gang of baddies led by Nelson.

During the Vietnam war, the American army forms a special unit called "tunnel rats" to go down into the elaborate system of underground tunnels constructed by the Vietcong, kill anyone they find in it and destroy the system.

Two members of Greenpeace discover that a local factory sheds radioactive waste into an active volcano, which has created a terrifying creature that wreaks havoc in the area.

Sergeant David Callahan leads a task force of U.S. Marines on a failed mission. Five years later, working as an adviser to Thai Special Forces, he is forced to return to the Vietnamese P.O.W. camp he escaped years before, to fight a deadly duel.