The guys continue making preparations for their trip, heading to Wales for off-road motorcycle training and making last-minute plans.

Ewan and Charley prepare for their adventure, including lessons for kidnap avoidance, fitness training, first aid, and vaccinations.

After making the first extended stop of their journey in Prague, Ewan and Charley continue onward to the Ukrainian border.

Before Ewan and Charley enter Mongolia, they have a small portion of Russia they must travel through first. They are thrilled to be on decent roads again, and make good time driving to Barnaul, a rather large Westernized city. Ewan and Charley are taken by surprise by the stunning gorgeous Altai region they find themselves in. There are literally no roads in Mongolia as we know them. Instead, the guys must follow tracks marked in the earth by trucks.

A bad fall and more mechanical trouble dogs Ewan McGregor and Charley Boorman as their motorbike odyssey continues. After regrouping to assess the damage, they head for Ulan Bator and are taken on an underground tour of the Mongolian capital's sewers. They then travel back into Russia and on to Siberia, where they're informed of a really bad stretch of road ahead. Reluctantly they decide to let a train take the strain.

Pushing on despite many setbacks, Ewan and Charley immerse themselves in the rich culture and their spirits are lifted by the beauty and kindness of the people of Mongolia. They know that the Road of Bones in Siberia (built by Stalin's prisoners) lies ahead and will surely test them further

Ewan and Charley take in the wildlife in Alaska then head across the border into Canada and ride into the Yukon region. They meet the Firefighters tackling forest fires and a Welshman who takes them up in his aeroplane to view a glacier. After a visit to Calgary Funfair, Ewan is almost injured when a reckless driver causes a near fatal accident