The series continues with a jam-packed show featuring Italian sports cars, military manoeuvres and a trip to Belgium.
Richard Hammond is on the shores of Lake Como testing the exciting new Alfa Romeo 4C, a mid-engined machine from one of the world's most beloved sports car makers. Hammond's enjoyment of the super-lightweight, 237 horsepower beauty is brought to an abrupt halt by the arrival of Jeremy Clarkson on a quad bike, demanding a race to the far end of the vast lake. Unfortunately for Hammond, Clarkson's quad bike is not entirely as it first seems.
Elsewhere in the programme, Clarkson is in the genteel surroundings of Bruge and at the rather less sedate Spa Grand Prix track in order to test a thrilling new breed of hybrid hypercar: the stunning, 904 horsepower McLaren P1.
Meanwhile, James May is at the vast Camp Bastion in Afghanistan looking at the incredible efforts behind the army's largest vehicle redeployment since the Second World War.
Actor Tom Hiddleston, star of Thor, The Avengers and War Horse, tries his hand
out on the track as the Star in the Reasonably Priced Car.
His appearance is set to take place in the second part of Series 21, which
will be broadcast in the UK on February 9 2014 on BBC Two .
Top Gear Series 21 started last Sunday , on BBC Two.