As conditions worsen during the gruelling arctic winter, Alaskans risk their lives to prepare for months of total darkness. Andy Bassich braves unsafe conditions on the Yukon River to hunt for needed meat.

Tracking the physical geography of each region- its topography, its climate and its extreme weather conditions. We identify the key species that live there and investigate how they have adapted to their habitat.

Steve Backshall, embarks on a perilous expedition to explore one of the world's wildest rivers, the mighty Baliem River.

Discover the stories behind each powerful and dramatic episode of the series.

Steve kayaks down the Baliem River's lower gorge, one of the most extreme stretches of white water on the planet.

As conditions worsen during the gruelling arctic winter, Alaskans risk their lives to prepare for months of total darkness. Andy Bassich braves unsafe conditions on the Yukon River to hunt for needed meat.

Thomas, under increased pressure from the threat of redundancy, is determined to prove himself in his job.

The pressure continues to build on Faith as she uncovers new truths amidst the fall-out of Evan's return. Evan's new freedom proves dangerous but Steve moves to protect Faith.

With David Baddiel, Ed Balls, Jo Brand and Kimberly Wyatt.

Wendy is compelled by her guilty conscience, Russ takes things to another level, and Kim is dumbfounded.

Frank and Luella are employed by self-obsessed Odette Dixon to investigate a fire at her hair salon that left her employee, Joelle, in a fatal coma.

Retired detective Steve McAndrew arrives to help investigate one of his original cases when the DNA of a girl who went missing in 2003 is found.