Fishing detective, Jeremy Wade, embarks on the biggest and most complex investigation of his career; to unravel the mystery of what happened to the passengers of a ship torpedoed in the mid-Atlantic during World War II.

The episode was rated 7.88 from 207 votes.

In the darkest depths of the Amazon lurks a dinosaur. Legends tell of an evil spirit inhabiting an enormous fish. Taller than a man, it is covered in scales and crushes its prey with a tongue made of bone. Jeremy Wade has encountered this creature once before, and he came out second best. He's taking no chances in the rematch.

The episode was rated 7.88 from 83 votes.

Extreme angler Jeremy Wade is on the trail of a monster that leads him to the site of the worst nuclear accident in history - Chernobyl. In a nerve-shredding race against radiation and time, he searches for the perpetrator of a series of grizzly attacks.

The episode was rated 7.91 from 94 votes.

It's common knowledge that crocodiles and hippos are deadly predators in Zambian waterways, but it seems there's another monstrous beast stalking the treacherous Zambezi River. The locals call this river monster "the Mazunda" but Jeremy Wade is unfamiliar with any fish by that name. Will he uncover what the sinister creature — said to be able to swallow a child — really is?

The episode was rated 7.96 from 74 votes.

Jeremy Wade travels to the Paraná River in the remote northeast corner of Argentina to investigate the death of a young girl. Once there, he discovers a second death. The people who live along this river bank fear the creature they call "River Dog." This is a new species to Jeremy, a river monster that somehow got under his radar. His discovery is not only the most alien of all river monsters, it is also the largest totally freshwater river monster Jeremy ever has caught!

The episode was rated 7.97 from 58 votes.

Jeremy Wade journeys to the infamous Congo River in Africa in search of the world's most ferocious fish. This supernatural monster predator pushes Jeremy to his physical and mental limit. It requires all of his skills and the help of a witch doctor.

The episode was rated 7.97 from 58 votes.

Having never been to Japan, Jeremy Wade is entering new territory in more ways than one. The river monsters there are like no others he ever has encountered, from the devastating "Namazu," which legend says causes earthquakes, to a child-snatching killer called the "Kappa." Can our extreme fisherman uncover the truth behind these legends? Can he catch a monster in the rivers of Japan that reveals the reality behind these horrific tales? He is about to find out.

The episode was rated 8.02 from 47 votes.

Angler Jeremy Wade ventures deep into the heart of Central America in search of a man-sized killer said to leap into boats and cause fatal injuries as it knocks fishermen unconscious and smashes their bones.

The episode was rated 8.04 from 106 votes.

Jeremy Wade sets out to discover the true river monster of South America. Piranhas get all the press, but is there a more fearsome predator lurking in its rivers? Tipped off by an account of an attack on a diver, Jeremy soon discovers that there is a real monster to find. Tipped off by the the local Amerindian tribe, Jeremy heads deeper and deeper into the remote jungles of Suriname to come face to face with a jungle killer like no other.

The episode was rated 8.04 from 48 votes.

A honeymoon bride is dragged to her death in the Colombian Amazon. The most dangerous country in South America, Colombia is known for drugs, remote jungles and hostage-taking rebels. Jeremy Wade’s investigation is turned on its head by a crucial piece of evidence. He concocts a farfetched hypothesis about the bride’s death and in proving it he uncovers a little known method of killing which reveals the true horror of this tragic story. To complete the puzzle Wade pushes himself and his gear past the breaking point to understand what killed the bride in Colombia’s Rivers of Blood.

The episode was rated 8.05 from 84 votes.

On the Canadian-U.S. border lies a vast and brooding lake that hides a dark history. For Native Americans, it’s an ancient and sacred site home to underwater spirits. But recently, something has risen from the murky depths to attack swimmers and stories abound of a nightmarish invasion of primordial bloodsuckers. In a journey that will take him to the heart of a thundering waterfall in the Pacific Northwest, extreme angler Jeremy Wade embarks on a punishing mission to battle the most ancient river monster he’s ever encountered, and reveal the true identity of the Vampires of the Deep.

The episode was rated 8.05 from 76 votes.

Jeremy Wade travels to Papua New Guinea to investigate a spate of bizarre deaths on one of the world's last great unexplored rivers, the Sepik. A creature there is tearing chunks from unsuspecting fishermen and devouring certain male body parts. Jeremy has never fished in this part of the world and knows little of what might be there. Nothing could prepare him for what he discovers.

The episode was rated 8.07 from 61 votes.

All over the Amazon, Jeremy Wade has heard stories of a monster fish that grows so large, it’s said to swallow men whole. Locals call it the lau-lau but after 20 years of searching, from Peru to Brazil and Colombia, the evidence Jeremy needs - a single colossal specimen - stills eludes him. Now though, he’s discovered a secret, untouched location deep in Guyana’s remote rainforests where he suspects they may be thriving. Embedding himself in the wild jungle, this time it’s different: he’s not coming back until he catches it.

The episode was rated 8.07 from 75 votes.

In Southern Africa there are rumors of a terrifying river monster lurking in the eerie waters of the Okavango Delta. Witnesses say the fish have shark-like teeth and hunt in frenzied packs on schools of fish — and maybe even on human bodies. It sounds mysteriously like the work of giant piranhas, but there's nothing like that here. Or is there? Jeremy Wade sets out to uncover the truth.

The episode was rated 8.08 from 77 votes.

A brutal underwater mutilation of a young man leads Wade to a face-to-face confrontation with one of South America’s greatest freshwater fighting fish that slashes and stalks its prey while living in one of Argentina’s most dangerous waterways.

The episode was rated 8.11 from 93 votes.