Two U.S. Marine investigators looking into a series of grisly murders in Manila discover that the crimes are tied to an amulet with a 400-year-old curse on it that has unleashed supernatural forces.

Hidden somewhere deep inside a volcano in the mysterious South American mountains lies the legendary lost kingdom of the Incas. And buried in this kingdom is a fabulous treasure of inestimable value.

To avenge the brutal murder of his brother, Jake Ray journeys to the Philippines, where his search for truth finds him battling both in and out of the ring. But the weapons are always the same: bare fists, bare feet. And the rules never change: last man standing wins.

Cheng is a young Chinese mainlander who moves in with his expatriate cousins to work at an ice factory in Thailand. He does this with a family promise never to get involved in any fights. However, when members of his family begin disappearing after meeting the management of the factory, the resulting mystery and pressures force him to break that vow and take on the villainy of the Big Boss.