Four groups of athletes embark on four never-before-accomplished missions.
Into the Void: Episode Image
Episode 1Into the Void
In Alaska's Glacier Bay National Park, three winter athletes attempt a daunting descent on Mount Bertha that has never been snowboarded or skied. (1 of 4)
Raging Torrent: Episode Image
Episode 2Raging Torrent
Three accomplished white water kayakers set themselves the challenge of being the first group to cross Ecuador's Llanganates National Park via the Chalupas River. (2 of 4)
Reaching for the Sky: Episode Image
Episode 3Reaching for the Sky
Two professional daredevils attempt to accomplish the first individual free climb ascent of a demanding route on Kyrgyzstan's Pik Slesova. (3 of 4)
The Great Unknown: Episode Image
Episode 4The Great Unknown
Two ambitious surfers must fend for themselves as they attempt to establish Africa's untouched west coast as the next big wave location. (4 of 4)
