The 17th edition of the reality series begins in Gloucester, Mass., and the 11 teams then fly from Boston to London. First, the pairs visit Stonehenge to find a clue and then travel to Eastnor Castle, where they use watermelons to knock down a knight. The team to finish first on the initial leg receive an Express Pass that allows them to bypass a future challenge.

Challenging detour tests one couple's relationship, while another team's Racer requires medical attention, threatening their position in the competition.