Four friends set out on a grueling jungle expedition to investigate a rumor of giant golden dorado in an uncharted Bolivian river. In their quest to be the first to fish these waters, they'll face torrential rains, deadly insects, and uncontacted tribes.

The guys head deep into Zambia in search of large tigerfish and the only things standing in their way are 400 miles of unpaved roads, crocodiles, hippos and a serious lack of fuel.

The crew heads to Mongolia in search of taimen, the largest, most ferocious member of the salmon family.

The men risk life and limb traveling through Borneo's jungles in search of mahseer, which has been fished almost to extinction.

The team follows a lead to an extremely remote river in Greenland, believed to hold massive Arctic char. With its barren tundra, towering fjords, and ice-carved valleys, they discover Greenland is wilderness at its most pure and most dangerous.