Zeb Hogan explores Florida's deep-water reefs and wrecks in search of a goliath grouper.

Known locally as payara, vampire fish weigh up to 40 pounds, hunt like great white sharks, make acrobatic leaps like giant tarpon, and have terrifying fangs up to 6 inches long that stick up through their heads.

Zeb Hogan is searching for a goliath that's so elusive, he'll scour every nook and cranny of the rivers of the Pacific Northwest to find it.

Zeb Hogan heads to southern France to catch a giant bird-eating catfish.

Zeb Hogan explores the rivers of Argentina on a quest to find a massive river ray.

Dr. Zeb Hogan goes to the Brazilian Amazon to figure out whether the shock of an electric eel is proportionate to the fishs size.

In Thailand, Zeb Hogan is on a mission to catch a monster snakehead, a fish in that looks more like a snake than a fish.

Dr. Zeb Hogan searches for the elusive wolf fish, navigating harsh terrain while avoiding heart-pounding encounters with anacondas, piranhas and vampire fish.

Zeb Hogan is on the hunt for a goldfish the size of a cow; giant carp can weigh 600 pounds and measure 10-feet long.

Jeremy Wade is not a fisherman; he's an "extreme angler" in search of the biggest and most dangerous freshwater fish, the kind with a taste for human flesh. This action-adventure series also features Wade illustrating how these river monsters are constructed to kill.

Aquatic ecologist Zeb Hogan gets up close and personal with bizarre giants of the water, specimens equally enormous in proportion and odd in appearance. Among other adventures, Hogan investigates flying fish from Asia that are invading America's waterways, and he searches for one of North America's toothiest and most-misunderstood monster fish, the alligator gar. Some of the species Hogan encounters have survived for centuries but now face the threat of extinction, and he presents groundbreaking research undertaken to protect them.

Before heading off on his next journey, Jeremy Wade counts down the biggest catches in "River Monsters" history.

Fish biologists and conservation experts go in search of strange and beautiful sea creatures.

Long-lost footage of a young Jeremy Wade searching for freshwater monsters.

Extreme angler Jeremy Wade goes in search of the biggest and most dangerous fish.

There appears to be dramatic evidence that some of the world's most iconic rivers are in declining health. Biologist, extreme angler and Animal Planet favorite Jeremy Wade ("River Monsters") investigates the disappearance of freshwater giants from the planet's largest waterways. He talks with people who live along the Amazon, the Ganges, the Yangtze, the Mississippi, the Danube and the Zambezi to understand how exploitation and pollution have degraded these rivers that were once home to his beloved monster fish. By gathering evidence, Jeremy learns about the rivers' health and sustainability and what is being done to save them.