The contestants start off their weight-loss journey by being dropped off in the middle of the desert, while their trainers standby about a mile away from them. The first two to reach their trainers will become the team captains, allowing them to pick their five teammates. However, this means the six remaining contestants have to be sent home, but Jillian Michaels returns to let them in on a little secret.
Bob and Kim prepare their teams for this week's challenge: racing up the stairs of a 10-story building. With immunity as the prize, both teams will have to do their best. Meanwhile, the secret black team, trained by Jillian Michaels, is finally revealed to the other contestants, who will join them in competing for the title of "The Biggest Loser" and 0,000.
When the teams are put in a room full of tempting, unhealthy foods, they will have to decide in four minutes if it is worth it or not to eat the most calories in order to win a three-pound pass which can be used to their advantage at the weigh-in. In the challenge, the contestants will compete in three different 100-meter heats against a yellow team formed by three kids, where the winning team will win a phone call home.
Another food temptation this week puts the trainers to the test instead of the contestants. Should Bob, Kim or Jillian give in to the temptation, it will give their team a 15-second advantage in the physical challenge. The challenge consists of the contestants running up and down a hill to reach their team flag in the fastest time. However, there is one catch: the teams will have to outbid each other with a faster time in hopes that someone will wager lower and lose, which will end up knocking out a team.
Alison surprises all three teams with an exotic getaway vacation, but they soon learn that they will be faced with temptations and challenges unlike any they have faced at the campus. Later, after the weigh-in, those who lost will try to forge an alliance with the others before deciding who to vote off.
The remaining teams compete in a special challenge testing the contestants' perseverance, with the winning team getting a surprise from home. After the weigh-in, one contestant is sent home.
The contestants play a version of poker, and the winner gets a prize that will change the game. After a dramatic weigh-in where one contestant shocks the others with their weight, one contestant is eliminated.
The trainers and contestants try to move on following last week's surprising game play. The physical challenge tests the contestant's endurance, with the winning team getting control of this week's competition. Later, one player is eliminated.
The teams go green and learn how to incorporate environmentally friendly habits in their lives. This week's physical challenge also incorporates recycling, with the winners receiving Ford Escape hybrids.
Players begin competing as individuals, and are faced with a temptation where one players is overcome by the donuts. Later, they compete in a triathlon challenge, and the winner gets to go home for 24 hours.
The contestants head to the set of Days of Our Lives soap opera, where friends and family wait to surprise them.
The viewers will choose this week's challenge for the seven remaining contestants.
The remaining six contestants are put to work in a pizza place. Later, they participate in a contest involving punching.
The five remaining contestants look back at their hard work up to date before one more is released from the show.
In the live finale, The Biggest Loser contestants from this season return for a chance to weigh-in one more time. Later, one of the final four is named the season's Biggest Loser.