Robert Llewellyn and Ashley Hames test their knowledge of extreme machines. Based on the popular card game of the 1970s and 80s, the series uses the Top Trumps format to examine all manner of contraptions - from enormous ships to giant diggers. This instalment enters the world of superyachts. Robert heads to the English Channel with record-breaking yachtswoman Dame Ellen Macarthur while Ashley travels to the Mediterranean for a ride on a £6million Pershing speedboat.