Travelling to incredible locations renowned for their fishing potential, Robson flies thousands of miles across the globe to be in the right place, with the right fishing guides, at exactly the right time.
But even then it's not going to be easy. Thunderstorms, drought, high winds and flash floods all have their part to play, and Robson will have to use every ounce of his fishing know-how, combined with the local guides and legends, if he wants to hook into the ultimate catch.
Fishing for huge predators from the mid-Atlantic, to hunting from a canoe in a lush volcanic crater, sight-casting on mysterious rivers in deep jungles, and learning local techniques from indigenous fishermen; he'll be hunting down migratory giants, netting huge crabs, and free-diving for a shape-shifting octopus.
Having travelled thousands of miles across the globe, and picked his perfect moment, will he be able to pull it off?
Payaras are most recognisable by their lower-jawed fangs – they have two teeth with which they spear and eat other fish. They're also known as the vampire fish or sabre tooth barracuda for obvious reasons!
The red-bellied piranha is a feared predator, but despite their razor-like teeth, this fish is actually more of a scavenger – their diet largely consists of other fish, insects and plants.
Samoan mud crabs live in mangroves and are cannibalistic – when members of their species moult their shells, other still-shelled crabs often attack and eat them.
Carnivorous pike fish are sought both commercially and for sport. Their torpedo-like bodies and sharp teeth make them a fearsome opponent in the water and they can also resort to cannibalism, eating their own species on occasion.
The wolffish might look fearsome but in fact, they're not particularly dangerous (unless threatened out of water). They don't even eat other fish, feasting mainly on molluscs and crustaceans. Their bad reputation comes from their abundance of teeth, which they have in their throats too.
The Bolivian golden dorado is a freshwater fish, which feeds on smaller forage fish, like sabalo. These fish are aggressive, with powerful jaws and sharp teeth, and are often targeted by fishermen and women due to their fighting qualities.
The red scorpionfish is a venomous, predatory, solitary creature, which feeds on molluscs and crustaceans. A sedentary fish, it hunts at night and lives deep in the ocean.
The wahoo (known as the ono in Hawaii) is a prized game fish found in tropical and subtropical waters. They're fast and large and well-regarded in gourmet circles!