The contestants race from Africa to St Petersburg, Russia. A task to re-code naval flag signals divides alliances, and the pit stop conclusion surprises everybody.

Teams travel to Lisbon, Portugal where they're put through the basics of singing, counting, and reading detail in their clues. Newlyweds Ashleigh and Jarrod face the biggest test of their relationship since getting married. Local seafood delights turn into an ordeal for everyone.