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After 21,000 kilometres, two continents and 17 countries, the teams embark on the final leg of their epic journey. However, a mammoth 4,800km still stands between them and the finish line of Ushuaia, Argentina - the most southerly city in the world.

Before leaving the last checkpoint in Mendoza, the racers are rocked by the departure of one team from the race. There is an emotional farewell as they reveal that, despite a valiant effort, they have finally run out of money and their race is over. Just under nine hours separate the remaining three teams, but budgets are running perilously low, meaning each team has to call on all the skills, ingenuity and strategies developed over the past seven weeks in order to win the race.

In a thrilling finale, the lead changes hands throughout as the teams navigate their way down through Patagonia towards Ushuaia. All teams are constantly juggling the desire to win the race with the need to work. Living hand to mouth, they negotiate tricky connections and sold-out buses, and endure hours by the side of roads, desperately trying to hitch rides.

As one team benefits from a monumental act of kindness to dig them out of a massive hole and keep them in the race, another eyes a prime opportunity to accelerate to the finish line, while the third gambles everything when it matters most.

This gruelling race has pushed them all to their limits, both physically and emotionally. It has taken the travellers to far-flung places – through deserts, mountains and island paradises - giving them the chance to experience incredible adventures, immerse themselves in different cultures, make lasting connections and often be overwhelmed by the kindness of strangers.

The racers embarked on personal journeys too, with relationships tested and bonds strengthened. This dramatic and at times unpredictable experience means the travellers complete the race as very different people from the ones who started.

There are remarkable twists and turns as the race culminates in an incredibly tight and dramatic finish, all set against the backdrop of some of the most breathtaking scenery in the world.

After 54 days, which team will triumph and be crowned winners of this race of a lifetime, claiming the £20k prize?