The world’s biggest urban adventure series returns to the capital. Wembley Stadium is the backdrop as thousands of competitors face a 10km course full of obstacles and surprises that will test their endurance, and sense of humour, to the limit. Along the way they will take on hundreds of challenges, crawl through mud, ice and tunnels, carry sandbags, beer barrels, and even tackle a pitch-dark storm drain beneath the streets of London. Dean Macey presents and takes on the course himself, alongside 10,000 others who include some of the best obstacle course racers in the world - keen to win this prestigious event.