Simon travels from Darwin in Australia's Northern Territory or 'Top End', across to the remote Cape York Peninsula, and on to the Great Barrier Reef. Simon sets off from Kakadu, the largest national park in the world, where the wildlife is under threat from the march of millions of poisonous cane toads. He joins a team of toad-busters catching the amphibian invaders - originally introduced to the country to kill pests. In Robertson barracks Simon meets Australia's best - and only - tank regiment. They will soon host 6,000 American Marines - evidence of Australia's strategic importance in the Asia Pacific region. On the Cape York Peninsula Simon joins scientists catching deadly box jellyfish, whose venom could prove to have great medicinal value. And on the Great Barrier Reef he dives in search of the starfish destroying coral, before flying 100 miles out into the ocean to watch as a huge tanker is expertly guided through the fragile reef.
In part 2 under the protection of armed guards, Michael discusses the country's nuclear weapons programme with an army lieutenant, visits a massive tourist resort being constructed on the beach, and embarks on a hike through the stunning landscape.
For Ray Mears there is one British pioneer who stands above all others in the exploration of Canada. That man is Samuel Hearne. In learning to travel using First Nations skills, he set the template for successful travel into Canada's wilderness. Hearne's story is defined by hardship and adventure, an inspiring tale made more powerful by the journal he left as a legacy. In a celebration of one of Earth's last great wilderness
Joanna ends her 5,000 mile journey in the place where she was born, Srinagar in Kashmir. She starts off in the Ranthambhore National Park, where she hopes to spot a tiger in the wild. Meeting tiger conservationist Belinda Wright, Joanna witnesses the work of local NGO Tiger Watch, who are attempting to break a cycle of poaching and poverty through education. Home to over 18 million people, Delhi is a city of stark contrasts. The extreme differences are obvious when Joanna visits a homeless community - where 10,000 men live under a flyover - and visits the modern part of the city where she has a go at working in a hi-tech call centre. The final leg of her journey takes her north from Delhi to Dharamsala, where she is granted a private audience with His Holiness the Dalai Lama. Joanna concludes her trip with a stay on a houseboat in Srinagar, as her parents did on honeymoon in 1941.
The odyssey continues as Colin Stafford-Johnson completes his journey along Ireland's Atlantic rim. Exploring the wildlife and mountains around his home inlet of Clew Bay, Colin then heads north for Donegal - golden eagle country - before reaching the island's northern tip and turning east along the coast of Northern Ireland.