Traveling through the heart of modern-day Persia on the second leg of the trek, Michael Wood journeys to the shores of the Caspian Sea, where the young conqueror was declared Lord of Asia; poised to invade Afghanistan. Entering modern Iraq, Michael is unable to travel to the site in Northern Iraq of Alexander's decisive victory against Darius and the Persians, as it lies behind a modern military frontline. Instead he flies there and, directly above the battleground, he describes the conflict for the navigator with the help of the aircraft's computer system. After the defeat of their Persian army, the young Alexander invaded Persia itself, in hot pursuit of the fleeing Darius. Michael picks up the trail with the help of Iranian guides and continues his trek through the Zagros Mountains. At the ancient city of Susa, he hears the traditional tale-tellers recite Alexander's story.