9/9 The five teams reunite to reveal fascinating insights into their experiences.
8/9 After 21,000 kilometres and 17 countries, the teams begin the final leg of their journey.
7/9 Two teams engage in a frantic race to avoid finishing the leg in last place.
6/9 Dom and Lizzie must use all their ingenuity to claw their way back into the race.
5/9 The four teams have reached the halfway mark in the 25,000km race to Ushuaia.
4/9 The four teams compete not just with each other but with the extreme altitudes of Peru.
3/9 Complications arise when a state of emergency is declared at the teams' next checkpoint.
2/9 Having raced hard in the last leg, leaders Jo and Sam are now keen to experience more.
1/9 Five teams set off from Mexico City in a race to reach Ushuaia in Argentina.
6/6 After 12,000 miles, 21 countries and four seas, the finish line is in sight.