The teams embark on the final leg of their journey, heading off on the 4,800 kilometre trek to the finish line in Ushuaia, Argentina, the most southerly city in the world. However, as they prepare to leave the last checkpoint, one of the teams reveals that they have run out of money and will not be completing the challenge. The three remaining pairs rely on different tactics to get ahead, benefiting from risky gambles, lucky opportunities and the kindness of strangers.

The teams enter south east Asia, starting the third leg from Vietnamese capital Hanoi. They must race over 2,000km through Vietnam and into the Kingdom of Cambodia to reach Phnom Penh.

With two teams at the checkpoint – Ilha Grande in Brazil – the remaining teams are engaged in a frantic race to avoid finishing the leg in last place.

To reach the next checkpoint - Cafayate in Argentina - teams must choose to travel through either Bolivia or Chile, but an unstable political climate in both countries puts everyone’s journeys at risk.

With three teams at the checkpoint at Cafayate in Argentina, one team is yet to arrive. Dom and Lizzie are over 24 hours behind their competitors and after a disastrous last leg must rely on all their ingenuity to claw their way back into the race.

As the 25,000km race to Ushuaia approaches the half-way mark, the four teams compete not just with each other but with the extreme altitudes of Peru.

The third series of Race Across the World reaches its epic climax as the pairs complete their gruelling journey across Canada. Which team will triumph?

Setting off from Panama City, they take to the Caribbean Sea, bypassing the most dangerous place in the Western Hemisphere - the Darien Gap.

41 days since the start on Canada's Pacific coast, the teams now have the Atlantic within their reach, lapping the shores of the seventh checkpoint at the seaside town of Liverpool, Nova Scotia.

In the sixth leg of the race, the pairs must brush up on their language skills, as the next stop is in Quebec. To get there, the teams must navigate Canada’s most densely inhabited region.

The race to Ushuaia is underway, and the five teams head out of Copan Ruinas in western Honduras to their next checkpoint – Panama City

In the first episode, the teams set off from Mexico City – a gargantuan metropolis and the largest Spanish speaking city in the world.

Five teams set off from Vancouver on a race across Canada. Without smartphones, internet access or credit cards, they will need plenty of ingenuity to make it to the finish line in Newfoundland.

The teams head for the fourth checkpoint, the remote outpost of Churchill, on Hudson Bay. The only transport is a twice-weekly train, and they have just three days to catch it.

The race to St John’s continues as the five teams leave Haida Gwaii and head into the heart of the Yukon towards the second checkpoint, the former gold rush boom town Dawson City.

The five pairs leave Dawson City and head south to the third checkpoint, the Rocky Mountain resort town of Banff. This time, the team arriving in last place will be eliminated from the race.

The teams head for Lake Huron, a 3,000-kilometre journey, but the pairs only have one way out of Churchill – a noisy overnight train south.

The five teams reunite for the first time to reveal fascinating insights into their different strategies and individual experiences - from their highest highs to their lowest lows.

The teams must navigate the full length of Thailand to reach the next checkpoint - Koh Phi Phi - an archipelago of islands immortalised by the Hollywood blockbuster movie The Beach.

After the tranquillity of the islands of Koh Phi Phi, the teams now face a giant leap into the unknown, leaving Thailand behind to embark on a 2000km journey to the Indonesian island of Sumatra.

The teams must travel through the populous Indonesian island of Sumatra, where they will endure an ad-hoc transport system, limited accommodation options and virtually zero English spoken.

With a thrilling third series of the Bafta-winning adventure now over, our five pairs meet up again to reflect on the adventure of a lifetime. Season Finale

Twelve minutes is all that separates the first two teams as they embark on the final leg of their Race Across the World from Jakarta to Lombok.

The five intrepid teams reunite in London to look back at their 51-day thrilling adventure through some of the most beautiful, populous and remote places on the planet.

The teams set off from Greenwich. They must pass through five checkpoints to reach their final destination. First up: the ancient city of Delphi.