A bitter war rages in Afghanistan during the 80's. Growing desperate, the Soviet Union creates an exotic chemical weapon. They test their creation in a massive cave complex, in Khost, Afghanistan. Unknown to the Soviets, the chemical works in unimaginable ways. Decades later, a team of Delta Force Operators goes missing in the same region. The lone survivor describes a nightmare that has awoken inside the cave. An elite group of special forces members from the Special Activities Division are sent in with one mission: kill everything inside the cave.