Five teams set off from Mexico City - a gargantuan metropolis and the largest Spanish speaking city in the world - in a race to reach the most southerly city in the world, Ushuaia in Argentina.
The teams head out of Copan Ruinas in western Honduras to their next checkpoint, Panama City. Having raced hard in the previous leg, leaders Jo and Sam are keen to experience more this time.
Setting off from Panama City, the remaining four teams take to the Caribbean Sea, but there are complications when a state of emergency is declared in the destination of their next checkpoint.
The teams have reached the halfway mark in the 25,000 km race to Ushuaia. To reach the next checkpoint, they must choose to travel through either Bolivia or Chile.
The next checkpoint is the island of Ihla Grande, Brazil, positioned halfway between Rio de Janeiro and Sao Paolo. Teams must travel 3,600 km east across the continent, making it the longest leg of the race so far.
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.