In Kenya, a helicopter crashes, causing panic among locals. American soldiers lead them out while searching for the attacker, but two soldiers vanish. They open fire on an invisible enemy, causing an explosion that knocks out their leader. He wakes up in a prison cell with amnesia. Nearby, a French doctor named Nadia explains the world is being invaded by machine-like aliens. Despite her warnings, he calls for help, attracting dangerous men seeking a reward for capturing Americans.