The Grand Tour is in Croatia to make a completely unscripted film featuring Jeremy Clarkson in an Audi TT RS, Richard Hammond in an Ariel Nomad, James May making a fire engine out of an old Lada, and everyone trying to find a non-existent link between the three. Also, Richard tests the McLaren 720S and Michael Ball and Alfie Boe go head-to-head in Celebrity Face Off.