In this week's programme, Richard Hammond is dropped into the remote, frozen wastes of Canada to test a watch with a built-in emergency beacon. The distress signal is sent directly to Jeremy Clarkson and James May, who get their hands on two machines and set off on an epic adventure to find their colleague. Plus, Jeremy puts the new 471bhp Lexus RC F coupe thought its paces, while The Fall and The X-Files star Gillian Anderson takes to the track in the Reasonably Priced Car.