The first episode is the Netherlands, where they try out the sport of canal jumping, before the pair don Lycra for a spot of velodrome track cycling alongside a world champion, and take on the world's tallest freestanding climbing wall.

The actor and his son continue their European adventure in Switzerland, where they take a ride on a mountain rollercoaster before exercising their vocal chords when they try the Swiss tradition of yodelling. The following day, Barney arranges a unique way for them to enjoy some local cheese, and then drive to the Contra Dam, where Barney reveals they are about to attempt one of James Bond's most famous stunts.

The actor and his son continue their European adventure in Slovenia, where Brad's passion for bikes gives Barney an excuse to take his dad motocross racing. They meet a beekeeper and are treated to some unusual honey therapies, before joining the national Quidditch team in the capital Ljubljana, and having a go at the notoriously dangerous sport of ski jumping.

The duo continue their European adventure in Italy, starting in the picturesque Lake Garda, where Barney surprises his dad by explaining they'll be running off the top of Monte Baldo and paragliding over the lake below. The next day Bradley is treated to a hair-raising ride in a Formula 1 speed boat, before the Walshes are invited to the home of opera superstar Andrea Bocelli.

The duo embark on the final leg of their European road trip as they explore more of Italy, engaging in gladiatorial combat in Rome, before continuing south and making a stop to soak up the views from a sky-high zipwire. As they reach their final stop on the Amalfi Coast, they get the chance to swim in the sea, but they'll have to dive in from a cliff.