After the first elimination, the game gets real! The first alliances are formed heading into the second Challenge, where their endurance and memory are put to the test. The Challengers quickly realise they are only as strong as their partners, and it will take a lot more than just physical superiority to take home a victory in this game. Power proves to be complicated for the Challenge winners when they are forced to choose between alliances and friends. Meanwhile, romance in the house heats up as one Challenger decides it's better to play hard to get.

All the sacrifices come down to this! The remaining Challengers put it all on the line as they race across the Argentinian countryside for their share of £100,000, the title of Challenge UK Champion, and their chance to represent the UK in the Challenge: World Championships, where they will compete against players from all across the globe. Host Mark Wright will make it challenging for the Challengers as they race all day, testing their endurance, stamina, strength, and smarts. These players will have to earn their right to take home the crown, the money, and the title of Challenge UK Champion.