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Comedians Rhod Gilbert and Greg Davies attempt to drive through the mountainous, landlocked nation of Nepal, starting from the chaotic border with India.
Comedian Sue Perkins and adventurer Charley Boorman travel across Alaska to the notorious Dalton Highway, where avalanche units operate throughout the year.
Adventurer Ben Fogle and comedian Hugh Dennis drive a historic route from the Peruvian Andes to the depths of the Amazon. They hope to find the lost city of Constitucion.
Celebrities board 4x4 vehicles to tackle some of the world's most infamous roads in tough regions such as Alaska, Nepal and Peru.