In this thrilling episode, the competition reaches new heights as contestants face their toughest challenge yet—a gruelling 42km marathon! The first male and female ex-contestant to cross the line gets back in the competition. Tensions are high as everyone battles to continue their incredible weightless journey.

The Biggest Loser Australia: Couples! With the help of the trainers, Michelle Bridges, and Shannan Ponton, a new set of overweight families, lovers and friends will change their lives forever. The contestant with the highest percentage weight lost will win a MASSIVE cash prize, and the title of The Biggest Loser!

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