For humankind, water is a source of eternal wonder, so too the creatures that dwell within this mysterious realm. The lure of the unknown is what drives fly fishers to explore and to seek out the largest fish of a species, not for the trophy but for the challenge. LEVIATHAN documents epic fly fishing battles with these modern-day aquatic monsters in a global tour-de-force. New Zealand is recognized as a mecca for trout anglers, but few realise that the largest of these live in tiny spring creeks hidden deep in the dense forests of the Bay of Plenty. LEVIATHAN descends into the forest to shine some light on these enigmatic beasts. Next are the giant rainbow trout of Patagonia’s fabled Jurassic Lake. This desolate and wind swept lake is undoubtedly home to the largest trout on the planet. Surprisingly, these brutes readily devour huge dry flies, leading to many heart-in-mouth moments for fly fishers. In the South Pacific, there is one denizen of the deep that demands instant respect - the Giant Trevally. Amongst fishermen the lore of their strength and aggression is second to none. LEVIATHAN follows fly fishers as they lock horns with these mighty fish in the coral reefs of French Polynesia and Australia’s Great Barrier Reef.