On a routine mission in Iraq the U.S Marine Corps recovers a computer hard drive detailing the location of certain weapons specialist Dr. Walsh. After witnessing the termination of his top secret weapons development program, Dr. Walsh finds an alternative funding source and sets up a new research facility deep in the notorious Belzan forest of Chechnya. Led by the physically imposing and intense Russo, a team of Deltas is ordered on a black ops mission to retrieve the doctor and his technology before the Russians find him and his lab. What Russo and his team soon discover is that the doctor's latest weapon is a flock of large carnivorous bats and that the doctor is using the marines as test subjects in his nightmarish experiments.