When six men vanish in the remote waters of northern Australia, extreme angler Jeremy Wade travels to the scene and embarks on one of his toughest investigations yet, taking on some of the deadliest animals on the planet in his search for a suspect.

Jeremy Wade is in search of the real creature behind the enduring legend of the sea serpent - starting with a violent attack in the English Channel, and culminating in the dark depths of the Mediterranean Sea.

Something is terrorizing the Florida Keys. It's attacking both visitors and locals alike, striking its victims so violently that it is slicing open flesh, even smashing bones. Jeremy Wade is determined to identity the assailant.

Extreme angler Jeremy Wade's cases usually involve freshwater culprits, but with multiple reports of a deep water serial killer in Mexico's Sea of Cortez, he must step out of his comfort zone and into uncharted depths in search of the red devil.

Jeremy Wade has hunted down freshwater killers for 30 years, but those waters are infested with darker, deadlier creatures - parasites.

In the West Indies, tales of swimmers being ripped from the surface of the islands' blue holes have been attributed to a monster known as the Lusca - half shark, half octopus. Jeremy Wade reaches new depths in this dangerous investigation.