On this leg of their global adventure Tom and Sophie head down under to the land of golden beaches and kangaroos - Australia. They're travelling by land, sea and air to explore the country, where Tom will take to the skies in a fighter plane.Along the way they marvel at the wonders of the Great Barrier Reef and have a gladiatorial battle, before taking the trip off road on the world's largest sand island , Fraser Island. They struggle with camping and the great outdoors, but soon inject some glamour into the adventure with a trip to X Factor Australia, courtesy of celebrity judge Dannii Minogue.A 400mph flight in a fighter jet is the perfect way to end the trip, but will Tom hold his nerve as he flies by the seat of his pants?