After eight years since the events of the first film, a scientist has designed a new species of bat genetically designed to be biological weapons in a confrontation between Chechen and Americans.

Set in present-day Afghanistan, the sequel centers on a group of soldiers who endeavor to capture Fazul, a fanatical terrorist who has escaped into the maze of caves underlying the landscape of the country. As the troops spelunk, they encounter one major obstacle: genetically altered bats programmed to seek out, and consume, flesh.—cjnb