Strangers Lilly and Luke are up against Claire and Beau, as they are dropped naked on a freezing mountaintop. One team loses the ability to make a fire as temperatures plummet.

Terry and Luke and Kim and Ant are dropped naked and miles from the beaten path, where they battle it out to survive, make shelter and race back to civilisation.

Couple Sion and Gareth race against Dylan and Pete in the Scottish Highlands. The two nude teams must forage for food, collect bonus items and make shelter.

Luke and Katharine compete against Amie and Michael to face disorientating moorland, dense forests, freezing rivers and a treacherous mountain climb.

Strangers, Merel and Mike, and Jenny and Steve, are stripped of their clothes and possessions and race across the English countryside to win a cash prize for charity.