His first stop is Lord Howe Island, where the pace of life is slow and the population is a steady 350. He also visits Norfolk Island, Australia's most easterly territory and the remotest island on Martin's journey.
The Python star continues his first visit to Brazil by travelling by river from the northern border with Venezuela to the capital of Brasilia. Along the way he visits indigenous tribe the Yanomami, learning about the threat to their hunter-gatherer way of life, before watching a rehearsal by the Amazon Philharmonic Orchestra and searching for the remains of Henry Ford's unsuccessful attempt to build a vast rubber plantation in the middle of the rainforest. In Belem, music producer Priscilla explains why Amazonian women are such powerful forces, then he moves southwards, meeting rock star and political activist Dinho Ouro Preto, who believes that despite its social and environmental problems, the country is on the brink of becoming a superpower.
In central Thailand's forests, fertile plains and even city streets, nature finds a way of living alongside people. Spirituality can be found in human and animal relationships, both likely and unlikely. This bustling region is known as the nation's rice bowl - but even here, there are magical places to be found.
The final leg of Ade's tour of Africa sees him travelling from the beaches of Mozambique, through South Africa, before ending his entire trip in Zimbabwe. He begins on the golden sand beaches of Mozambique's Bazaruto Archipelago, one of Africa's highlights. At Paradise Island, he finds an abandoned hotel, a visual reminder of Mozambique's recent history - this place was once a high-end tourist destination, but 25 years of colonial and then civil war put a stop to development. But the local wildlife has benefited from the fact that so few tourists now come here, and Ade is able to snorkel with one of the world's most elusive sea creatures - a dugong. Since the wars, Mozambique has struggled to develop, and Ade meets someone for whom life is especially hard – a wheelchair user like himself. In a country where disability is viewed with fear and superstition – and believed by many to be contagious – even catching a bus proves impossible for Castigo. The best thing in his life is exactly the same thing that turned Ade's life around - wheelchair basketball - and Ade can't help getting carried away in a game. Along the coast, at one of Mozambique's largest ports, Ade finds out that China is investing a huge amount in Mozambique – and elsewhere across Africa. The money often comes with strings attached, but a poor country like Mozambique needs financial help, which has to come from somewhere. Ade's next stop is South Africa. The country is famous for its wildlife but Ade hears how Chinese influence is having a dramatic impact here – the country's rhino population has been decimated by poachers, driven by a demand for rhino horn in Chinese medicine. Ade follows rangers with a surprising way of tackling the problem - by cutting off the rhino horn themselves, they hope to deter poachers. Ade travels to Johannesburg to see how the country is faring 25 years after apartheid ended. On a tour of the city, he is upset to discover that although the black population now have voting rights, they are living in an economic form of apartheid, with 25% unemployed and many squatting on whatever land they can find. In an emotional scene, Ade visits a squatted piece of land, moments after the police have destroyed people's houses, to hear claims that Mandela's legacy has been forgotten. Land reform is the big political issue here today, with many calling for a redistribution of land from rich white farmers to the black population. The final stop on Ade's African adventure is Zimbabwe – where land reform has already happened, with disastrous results. Ade finds a country still struggling economically. His first stop is the Kariba dam, and a hair-raising boat ride on the vast and stunning Lake Kariba. Ade finds that locals are worried about the stability of the Kariba dam and work has begun to stabilize undermined foundations. The worrying decay of this crucial dam is a sign of how much this country suffered under the rule of Robert Mugabe. As Ade has seen so often on his trip around Africa, Zimbabwe is a country that should be rich. It has huge quantities of gold – enough, in theory, for the entire population to be a millionaire. But there isn't the infrastructure of investment to get at it - in a country dogged by poverty and corruption. But the departure of dictator Robert Mugabe brought a new optimism, and Ade meets gold miners who are willing to risk daily exposure to toxic mercury for every scrap of gold they can get and an entrepreneur who believes the industry can be transformed. Despite the return of violence and repression in Zimbabwe, Ade ends his journey on a high, visiting a remote hut that has been turned into the set of a music video. He joins UK indie musician Shingai Shoniwa as she shoots the video for her forthcoming debut single, Coming Home, in a country that she believes is on the up, and deserves a fresh chance.
The seasoned traveller explores the South American country, beginning in the north-east - where Europeans first landed and grew rich on the profits from sugar and tobacco plantations run with slave labour. In Sao Luis, Michael finds out about a ceremony based on a 200-year-old tale before heading to the coastal lagoons of the Lencois Maranhenses National Park. Journeying inland, he gets a glimpse of the fast-disappearing world of old-style cowboys known as vaqueiros, has his fortune read by a Candomble priest and learns to drum with the Olodum cultural collective.
The actress heads to the island of Shikoku hoping to gain a better understanding of Japanese Buddhism. She then takes a bullet train to another island - Kyushu - where she finds the Henn Na Hotel, the world's first robot hotel. At Nagasaki, she visits Shiroyama Elementary school, one of the only buildings to survive the atomic bomb dropped on the city in 1945. Joanna then travels to Sakurajima, one of the country's most active volcanoes, before heading to the islands of Okinawa where one of the bloodiest battles of the Second World War was fought.
Simon recalls some of the most dangerous experiences of his travels, from coming under fire in war-torn Mogadishu to squaring off with a female wrestler in Mexico City. Among the past destinations featured are a police cell in the far east of Russia, and the programme also looks back at his encounters with ambulance crews in San Salvador and anti-smuggling police in Italy.