In 1955, Tim Slessor drove a Land Rover 19,000 miles from London to Singapore in an expedition partly funded by a young David Attenborough at the BBC. Sixty years later, at 87, Slessor sets out to reverse the route, from Singapore back to London, in the same model of vehicle, with his grandson Nat George behind the wheel. The four-part series follows their crossing of Myanmar, where they mix with royalty, and India, where they stumble into a tribal turf dispute. Barred from Afghanistan, the team reroutes through China and Central Asia, facing altitude sickness, freezing temperatures, and reports of bandits along the way. In Turkmenistan the aging Land Rover breaks down and has to be resurrected before the final push through the former Soviet republics toward the finish line. Told largely through footage shot on the road, the series balances the mechanical grind of keeping a decades-old car running with the personal stakes of an elderly man trying to finish what he started as a young man.