Two modern day teams of explorers including Bruce Parry (Tribe) have been set the challenge of travelling across a route identical in length to that covered by Scott and Amundsen. In tonight's episode, the British and Norwegian teams have acclimatised in Greenland and have familiarised themselves with the early 1900s expedition equipment. However, within days of being on the ice cap, a violent blizzard strikes both teams with near fatal consequences. For the Brits, the storm is an unwelcome delay and alarm bells are starting to sound in the tent. Their progress has been dire, largely because they have been unable to control their dogs. If they don't get a grip, soon they will fail to make it to their first depot of food.