An American soldier survives a brutal ambush in Borneo during World War II, escaping the execution of his comrades by disappearing into the dense, uncharted jungle. After days of wandering, half-mad from hunger and fever, he washes up on the shore of a remote island — only to discover it is inhabited by a tribe of fierce headhunters. Instead of killing him, they take him in, intrigued by his courage and strange weapons. Over the years, he rises to become their leader, reshaping their warrior society into a disciplined jungle force. But when Japanese forces invade the island and massacre his adopted tribe, the soldier abandons his isolation and launches a savage war of vengeance — not as an American, but as the warlord of the jungle.