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All of this season's contestants reunite and compete for the at-home prize; America's vote determines the third finalist; one contestant wins the grand prize.
The final four contestants leave the ranch and transition back to life at home, showing off their new slimmer selves to family and friends and facing the temptations and challenges of everyday life.
Special guest Nastia Liukin, a five-time Olympic medalist and four-time World Champion gymnast, meets up with the players for a pop challenge that tests their stamina as they compete in five different exercises.
The Biggest Loser catches up with former contestants and ban them together to participate in a triathlon!
The competition moves to singles, so contestants will compete on their own without partners or teammates from this point forward.
One player wins the power to pair off the others, leading to the most explosive weigh-in all season.
The Biggest Loser contestants are whisked away on military trucks to Camp Pendleton, where they will live and train like Marines for the week.
It's the ultimate test of teamwork and timing as both teams race to win the challenge and a prize that will give them a valuable advantage at weigh-in.
The contestants face their first temptation in the form of cupcakes, one of which represents a potentially huge prize for the winner that could grow more valuable each week.