For the first time ever, teams of two will compete against each other rather than individuals. Ten teams - including a mother and son, husband-and-wife, best friends, brothers and a divorced couple - have to pick their trainer, weigh in and compete in challenges together. The teams will have to pull a giant hot air balloon across a field, with the winner getting a coveted 2 lb. advantage at the first weigh in.
The nine remaining teams are surprised by the news that Bob and Jillian will be training them together as one team. Then the contestants are tempted by a delicious barbecue buffet, and the challenges get more difficult as they are tasked with riding giant seesaws! In the end, one more team is sent packing.
The remaining eight teams compete in a game of "elimination" where the last team standing wins immunity so they can't be sent home this week. While the challenge causes rifts in the house as the players become more competitive, the trainers are determined to work the teams harder and post more impressive numbers on the scale.
A surprise elimination pits one outcast duo against all of the others. At the challenge, contestants compete for a prize they all desperately need after nearly a month away from their loved ones - letters from home. Three teams plot to throw the weigh-in, and then have a change of heart, but is it too late for them to turn back?
One team retaliates after being called lazy by another team and the willpower of the contestants is put to the test during a soda temptation. Then the game is changed forever after a dramatic escalator challenge.
Teams compete in a lively cook-off challenge, the winning team gets a special dinner prepared by Rocco, plus a very desirable "surprise" from home. Also, one team faces a setback when one of their strongest players suffers an injury, and one of the contestants gets a surprise visitor.
The contestants celebrate nearing the halfway point of the game with a challenge involving their weight loss totals. Plus, they receive an inspirational visit from their doctor to assess their health advances.
The remaining contestants are sent home, and see their loved ones for the first time since leaving to come to the ranch. But this is no vacation as the contestants must eat and exercise without the help of their trainers and with all of the distractions and temptations of the real world. After returning to the ranch, the teams face off in a challenge that tests their endurance before an elimination round sends another player packing.
One team is surprised with a special trip to Las Vegas and in a very emotional elimination, one unsuspecting player makes the ultimate sacrifice for their team.
The remaining players face off in one of the biggest challenges in "Biggest Loser" history -- they must fly across a ravine on zip-lines and collect flags. One player gets the chance to give immunity to himself or one of his teammates, and his decision ultimately affects his own fate.
All fourteen of the players eliminated so far return to the ranch and surprise the six remaining contestants. At weigh in, the scale reveals how the eliminated contestants have done on their own at home, and the man and woman who have lost the most weight get to return to the game!
It's makeover week and legendary fashion maven Tim Gunn helps the contestants find flattering new clothing styles and haircuts. Then, players must walk backwards on treadmills suspended above water - and two contestants battle it out for more than an hour!
Only six players are left, and the remaining women try to hold their own against the men who are still in the game. In a surprising pop quiz, one player wins a mysterious prize. And at this week's challenge, the players get the chance to sabotage one another by giving each other calories.
The last five players are surprised with a trip to the other side of the globe Australia! Once there, they get a visit from the Biggest Loser: Australia winner, Adro, compete in a race around the city of Sydney, and climb the legendary Sydney Harbor Bridge. In the end, the final four players are determined by an emotional weigh-in and elimination.
The final four contestants return from Australia without their trainers and attempt to train themselves for their last week on the ranch. Celebrity Chef Rocco Dispirito visits again to teach the contestants how to make healthy versions of their favorite dishes before heading home, and the final four all watch videos of their most memorable moments on campus.
All the contestants from this season return for a special reunion and a chance to weigh in one last time and show America how much weight they've all lost since beginning their weight-loss journeys.