Jeremy investigates the piranha's fearsome reputation; hears stories of deadly attacks by the man-eating goonch catfish; and listens to tales of a man-eating Wels catfish.
The angler hunts for the goliath tigerfish in the Congo River; searches for the giant freshwater stingray in Thailand; and swims into the lair of a snakehead fish.
Jeremy investigates reports of bizarre deaths on a river in Papua New Guinea; searches for a mysterious 8ft creature in New Zealand; and visits the Parana River in Argentina to hunt for a creature armed with a razor-sharp blade tipped with tissue-destroying venom.
The biologist tracks down a deadly fish in southern Africa; visits tourist hot spots in America where people have been attacked by a killer catfish; and tries to find a mysterious predatory creature in the Zambezi river.
Jeremy hunts for an elusive lake monster on the site of the Chernobyl disaster; travels to Colombia to search for a fish suspected of dragging a woman to her death; and visits Central America to track down a marine creature believed to be 8ft in length and weighing 300lbs.
The sixth series of River Monsters sees Jeremy Wade return to the scene of some of his greatest angling adventures as he takes on some of the biggest, most mysterious and certainly most dangerous of the Amazons denizens of the deep.