Jeff Henry: The Snowman, is a mini biography of sorts about Yellowstone National Park ranger Jeff Henry, whose obsession with (and jobs related to) snow helped the BBC crew identify the best places to capture the Park in the winter. This feature also explores how Henry does his job clearing snow from the Park.

In Geyser Gazers, the second of the three Extras, viewers learn how the BBC crew setup their picturesque geyser shots and the struggles they endured to capture all the amazing imagery in this miniseries. It also introduces viewers to the locals who acted as guides for the BBC crew and lent their first-hand knowledge of geyser schedules and "personalities."

Mike Kasic: The Fishman, viewers learn more about the man who helped BBC capture its fish scenes through his extensive knowledge of Yellowstone's waterways and fish.

Following Yellowstone's wildlife in a fight to survive six freezing winter months.

Following Yellowstone's wildlife in a fight to survive six freezing winter months.

Elk move down from the mountains and beavers repair their dams in preparation for winter.