The Grand Tour travelling tent arrives in Nashville, Tennessee from where Jeremy Clarkson, Richard Hammond and James May introduce their attempt to save the world's coral reefs using only a selection of car body shells and some extremely inept boat driving. Also in this show, Jeremy finally indulges his series-long Alfa Romeo obsession with a test of the new, 500 horsepower Giulia Quadrifoglio and AC/DC singer Brian Johnson comes to the tent to try his hand at Celebrity Brain Crash.