It's all aboard for another leg of the mystery journey around Europe, and this time games master Rob Brydon has even more surprises in store. Not least that the passengers are swapping the X-bus for the Destination X-press – a train that will take them through a whole new country.

Split into two teams, the passengers must embark on a relay race of challenges in order to win the all-important clues. But after having their geography knowledge and their taste buds tested, will the winners be willing to share the clues when they get back on the bus?

Before they even get the chance, another spanner is thrown in the works when Rob brings back some familiar faces. But what does that mean for the bus OGs?

After leaving a player behind in the land of music and rolling hills, the X-bus now makes its way to one of Europe's biggest winemaking regions and the halfway point on this extraordinary journey. But while host Rob Brydon raises a glass with the passengers, he still has plenty of tricks up his sleeve. In an ancient vineyard, he tests the players' knowledge of each other and reveals who they consider to be their biggest threat. And one lucky player wins a game-changing advantage - the ability to sabotage one of their rivals in the map room.

But as the players make their way closer to Destination X, they also stop off at an ancient walled city to pair up for one more challenge that could win them a valuable clue. Alliances are tested as vital information isn't shared with everyone, and one passenger uses their incredible power - sabotage a teammate and affect their X on the map. But who will they choose?