Earth's history is marked by one cosmic disaster after another, forging the path of human evolution. Asteroid and comet collisions, flares from the Sun, mass extinctions, supernova explosions, cosmic ray bombardment. You name it, we've experienced it. It's kind of a miracle we're here at all. Now, experts explore how the Earth has teetered on the verge of destruction.

Voyager, the most ambitious space mission in history. They're the first probes to truly explore half the planets in our solar system: Jupiter, Saturn, Uranus and Neptune. These went from dots of light in the sky, to real worlds. The Voyager missions have ventured far beyond where other probes have explored. They're the first spacecraft to taste interstellar space, exploring further than any human made spacecraft has gone before. They are the greatest space mission ever. The legacy of Voyager is our remnant, it is our memory. It is a sampling of humanity that is out there now among the stars. And if they last until the death of the Universe, as the final stars fade, and everything goes dark, they will be humanity's final statement: ‘We were here.’
In the last episode of the season 10, experts explore the ultimate, ongoing mission of the Voyager spacecrafts.

When he killed Mehmed’s messengers, it was a message from Vlad Dracula that he would not pay his yearly dues anymore and it was clear that Vlad wanted a war against the Otoman Empire. Mehmed II sends Mara to coax Hungarian King Matthias Corvinus into an alliance. Vlad Dracula’s army was less than 30,000 men, but he invaded Bulgaria and started killing Mehmed’s men in 1462. He stole the Ottomans’ uniforms for his further attacks on the empire. Vlad also destroyed many ports that were under Sultan Mehmed II on the Danube.
Mehmed had to cross the Danube in order to reach the capital city of Târgoviște and defeat Vlad. The sultan faced the challenge of transporting 100,000 men across the river. Along with men, he had to transport cannons and horses too. The first unit to cross the river Danube included Mahmud Pasha, who was the most trusted man of Mehmed II. An epic battle along the Danube River looms, and Vlad has the upper hand.

When Mahmud Pasha and his men were crossing the river at night, Vlad Dracula started his first attack on the Ottomans. However, Mehmed II was smart enough to know that Vlad would be waiting for them. Mehmed II counterattacks Vlad’s army, and we see the first great battle here.
After his victory, Mehmed's troops advance into Wallachia, and Vlad employs guerrilla tactics to weaken his rival. At one point, Vlad Dracula released some criminals with tuberculosis and bubonic plague in order to infect the Ottomans. He sent these infected criminals to the Ottoman camp at night, and it is considered a great tactic by the experts because we see Vlad Dracula practicing biological warfare. Meanwhile, a threat lurks in the imperial palace.

Vlad Dracula presses an increasingly desperate guerrilla campaign from the shadows, hoping to demoralize the Ottomans and slow their march north. After chasing Vlad for two weeks, sultan Mehmed II and his invading army find themselves caught in a nightmare come to life deep within the Wallachian forest. Many legends have arisen out of the invasion of Wallachia in 1462. One speaks of Vlad Dracula launching a biological attack against the Ottomans to slow their march to his capital city, Târgovişte. Vlad opened his prisons and released hardened criminals to go amongst the Ottomans with tuberculosis and bubonic plague so that they could infect the enemies.
Vlad Dracula also had carried out a scorched-earth policy against Mehmed II. Along with his hit-and-run campaign from the shadows has left the sultan's troops on edge. As Mehmed's army closes on Târgovişte, tensions flare in the Ottoman camp, where food and water are in increasingly short supply. But Vlad had nowhere to rely on food for himself either and there was nowhere to go anymore. He became a prisoner of his own scorched-earth policy. Radu Dracula closes in to take Princess Anastasia hostage. Anastasia commits suicide when he reach her at Poenari castle.

After two weeks of chasing Vlad Dracula across Wallachia, Mehmed the Conqueror and his exhausted Ottoman army camp on the outskirts of Târgovişte. Their attack on the capital is imminent. But the man known to the Ottomans as the ‘Impaler Lord’ has turned the surrounding countryside into a chamber of horrors. Raiding during the night, sentries disappearing from the Ottoman camp, being taken outside and being murdered by Wallachian raiders. An exhausting day of marching followed by a night full of terrors, but yet still, Mehmed begins to close on his prey.
Mehmed prepares to strike a fatal blow to Vlad's army. A spy is found in Mehmed's camp. Vlad Dracula planned to kill Mehmed II in his tent in a very famous historical event called the ‘Night Attack.’ Vlad ambushed the Ottoman camp with his army in a surprise night attack. His plan was to confuse the Ottoman army by using their uniform so that they could not distinguish between the Turks and the people of Wallachia, but a surprise awaits.