Amazonia

The Rand scientific expedition entered the Amazon and never returned, until years later, when one of its members stumbles out of the rainforest -- a former Special Forces soldier, scarred, mutilated, terrified, and mere hours from death, who went in with one arm missing - and came out with both intact. The government sends Nathan Rand to follow the trail of his vanished father, but the nightmare that is awaiting Nate and his team of scientists and seasoned U.S. Rangers dwarfs any danger they anticipated.