It's on tonight at 8 PM GMT in the UK.

"Jeremy, James and Richard have a challenge: to travel the length of Vietnam in just eight days. Yes - eight days. They have millions of Dong [Vietnamese currency] to buy suitable transport to complete the journey, but they discover it's only enough to buy two-wheeled transport."

This is going to be awesome!

When will it be aired in the U.S.?

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram