This week, Robson packs his bags and rods for a trip far off the beaten track in search of pristine fishing grounds that even Australians regard as down under. His destination is the Australian island of Tasmania.

Mozambique is one of the lesser-known African countries, often bypassed by visitors in favour of the more established East African destinations to the north. For the adventurous angler keen to throw a line in more uncharted waters, however, Mozambique is perfect for all forms of fishing.

For his first battle, Robson heads to the Westman Islands, south of the capital Reykjavík. Icelanders claim that these small, remote volcanic islands are the cod capital of the world. His opponent is a man who was born into a fishing dynasty and caught his first cod at the ripe old age of seven. The man who pulls in the most cod wins the day. Next, Robson travels to the frozen wastelands of the highlands to join a group of ice fishermen. His opponent for the day is a retired professional opera singer, who uses every trick in his song book to put Robson off his game. The target is Arctic char and the angler who lands the heaviest combined weight is the winner. Victory is traditionally washed down with a shot of Icelandic hooch. Robson then takes on a Viking blacksmith with a terrifyingly long cast. Perched on the rugged cliffs over Eyja Fjord they cast into the icy sea for dab and cod. The further they cast, the better the chance of catching.

Robson is in Hawaii where he competes against the American state's best anglers. He starts by going big-game sea-fishing in pursuit of the Pacific blue marlinand then he hunts for giant prawns in Waipio, before fishing for largemouth bass on Lake Wilson against an opponent who has presented his own fishing show on television for over a decade.

Robson makes his way to South Africa to take part in a series of challenges, starting by teaming up with his uncle Matheson in pursuit of yellowfish. He then goes fishing on a ski boat, before going on the hunt for the great white shark off the coast of Cape Town.

In South Australia, Robson Green takes on five local master anglers, including one of the most foul-mouthed fishermen he has ever encountered, an Aborigine and a boxing champion. His haul includes crayfish, salmon and the rare and massive Murray cod, but even the most dedicated fishermen cannot ignore the spectacular scenery.

Robson heads for the other side of the globe and the fishing challenge of his dreams – New Zealand. The flight from Newcastle to New Zealand takes 32 hours, but for any angler the trip is worthwhile. New Zealand is one of the most hostile sporting environments on earth, and Robson knows that he is in for a battle. His first challenge takes him to the waters off the port of Nelson on the north coast of New Zealand's South Island. After being dropped in by helicopter, he faces an extreme challenge that requires an extreme form of angler, such as his opponent. Toby Reid is a man who specialises in fishing the places other fishermen cannot reach. The target for the day is the New Zealand Blue Cod, a sports fish Robson has never caught before. Robson then heads for the mouth of the Hurunui River on the South Island's east coast, where he goes after Kawahai or the Salmon of the Sea.

Robson flies over 6,000 miles from the UK to this fisherman’s wonderland for a five-round angling face-off. When Robson first visited in 2000, his passion for extreme fishing took off. Over a decade later, he returns to prove himself by taking on the very man who first taught him to deep sea fish. His opening challenge takes him to the dazzling lagoons in the south east of the island. His opponent for the day, Dominique Thevanau (aka The Dominator) is a fishing veteran whose extreme speciality is taking a fly rod into the surf that breaks on the edges of the lagoons. The pair target the huge shoals of giant trevally feeding on the reefs, with the person who catches the most fish winning. But it seems that Robson is catching more surf than fish. For his next challenge, he heads inland to the island’s fertile interior in search of one of the best kept angling secrets in Mauritius. Among the thousands of cane fields lies a little-known lake that is a bass fishing haven.