Season 5

In Mongolia, Ross examines the rise in violent far-right vigilante groups, who fear their country's identity is under threat from foreign influence

On the USA-Mexico border, Ross discovers the harsh realities for the men and women attempting to make a new life in America and learns how their journey is becoming increasingly deadly, meeting the traffickers exploiting the migrants and the border patrols determined to stop them. The actor examines what drives people to make this dangerous crossing, the practicalities of preventing them and the role the migrants play in America's economy

Ross investigates the violent and corrupt world of elephant poaching in Mozambique. If the slaughter continues at its current rate, the animal will be extinct in the country within five years, so he goes undercover to expose the traders who will sell ivory for export to the Far East. He discovers how weak the official response to the crisis has been and also reveals how China's growing prosperity increases demand

The actor investigates how Colombia's drug trade undermined the war-torn country's attempts to forge a peace accord after decades of civil war

The actor heads to Syria, where he experiences the Kurdish peoples' fight against ISIS when he is pinned down by sniper fire on the frontline. As he travels across Kurdish-held territory to investigate the fight against the jihadists first hand, Ross meets Kurdish men and women fighters, as well as victims of ISIS occupation, and witnesses the new Kurdish state of Rojava come into being