Unit 51

They are not human. At a research station in Antarctica, five of the world's top scientists have been brought together to solve one of the greatest mysteries in human history. Their subject, however, is anything but human . . . They are not natural. Deep beneath the ice, the submerged ruins of a lost civilization hold the key to the strange mutations that each scientist has encountered across the globe: A misshapen skull in Russia. The grotesque carvings of a lost race in Peru. The mummified remains of a humanoid monstrosity in Egypt . . . They are not friendly. When a series of sound waves trigger the ancient organisms, a new kind of evolution begins. Latching onto a human host-crossbreeding with human DNA-a long-extinct life form is reborn. Its kind has not walked the earth for thousands of years. Its instincts are fiercer, more savage, than any predator alive. And its prey are the scientists who unleashed it, the humans who spawned it, and the tender living flesh on which it feeds . . .

IT HAS SURVIVED. At a research station in Antarctica, scientists discovered a strange and ancient organism. They thought they could study it, classify it, control it. They couldn't. IT HAS THRIVED. Six months ago, a secret paramilitary team called Unit 51 was sent to the station. They thought the creature was dead, the nightmare was over. It wasn't. IT HAS EVOLVED. In a Mexican temple, archaeologists uncover the remains of a half-human hybrid. They believe it is related to the creature in Antarctica, a dark thing of legend that is still alive-and still evolving. They believe it needs a new host to feed, to mutate, to multiply. They're right. And they're next. And the human race might just be headed for extinction . . .

IT LIVES. In a research hangar in Virginia, a Unit 51 team studies an ancient but long-dormant virus that can transform human physiology-and turn it into something else... IT MUTATES. In the Amazon rain forest, a newly evolving life form known as Subject Z acquires the ability to think conceptually, build elaborate traps, create new carriers-and spawn a new race... IT SPREADS. In Mexico and Turkey, the men and women of Unit 51 race to uncover a global link between the mutations: a connection as ancient as the oldest tombs on earth-and as alien and unknowable as the universe itself. But time is running out. The infected are growing in number. And the nightmare is going viral.