Dodging massages in a thermal pool and a visit to an eerie abandoned theme park during their one week journey through Bulgaria sees Ellie and Mark reach the border with Turkey. The major milestone this week is reaching the Black Sea, which they find out is both salty and cold.

Bear-related big surprises in the Carpathian Mountains see Ellie and Mark hurriedly packing down their tent in the dark, and making a mad dash down a mountain road at dusk.

A low ebb as Mark and Ellie wrestle their bikes while shin deep in mud on a Romanian mountainside. Their mood is lifted as they rejoin the Danube, and celebrate a significant day in their own inimitable style.

During the fourth week of their round the world cycle, Ellie and Mark enjoy snowdrops and snowflakes on the German section of the Danube cycle way. There's no sign of them waning after a month on the road, although Mark needsmto call in a sick day.

Week three of their attempt to cycle around the world sees Mark and Ellie visit the city of Strasbourg for a little longer than planned. They journey through the Black Forest, spin around Lake Constance where a serious mechanical failure has unexpected results. This episode contains crisps. Lot and lots of crisps.