The Americans are coming, but will the war be over by the time they get there? Germany throws everything into a last series of stupendous attacks in the West while hoping to avoid getting burned by a fire in the East they helped fan.

Politics, diplomacy, revolution and mutiny take center stage at the start of this episode, but mud, blood, shells and tragedy drown all by the end.

Machine guns, barbed wire and millions upon millions of artillery shells create industrialized meat grinders at Verdun and the Somme. There's never been a human experience like it and it changes a generation.

More military history. More quintessentially "Dan" twists. More deep questions. In this "Director's Cut" style addendum to HH 47 you get all that, plus cutting-room floor stuff and Dan talking about the challenges this episode posed and why he made "Wrath of the Khans" the way he did.

Succession issues weaken the Mongol Empire as the grandchildren of Genghis Khan fight over their imperial inheritance. This doesn't stop them from dealing out pain, suffering, and ironically good governance while doing so.

The death of Genghis Khan, the founder of the Mongol Empire, should have slowed the momentum of Mongol conquests, but instead it accelerated it. This time though, all of Europe is on the Mongol hit list.

The expansion of Genghis Khan's conquests continue, with locations as far apart as Europe and China feeling the bloody effects of Mongol warfare and retribution. Can anything halt the carnage?

The Mongol leader Genghis Khan displays an unmatched level of strategic genius while moving against both Northern China and the Eastern Islamic world. Both civilizations are left stunned, and millions are slaughtered.

In one of the most violent outbursts in history a little-known tribe of Eurasian nomads breaks upon the great societies of the Old World like a human tsunami. It may have ushered in the modern era, but at what cost?

A traumatized people who traumatized their neighbors, the Native American tribe known as Apache were among the last Indians to surrender to the U.S. Government. Dan, of course, has thoughts. This is a long show!

What would happen if half the population died in a short period of time? Dan looks at the Black Death and other plagues that created almost apocalyptic conditions in the past...and maybe in the future.