The 12 contestants are split into two teams: the red team and the blue team. The Blue Team wins the first challenge and receives five pounds of lard to use against the losing team at the weigh in. However, the Red Team still wins the weigh in. Dana is eliminated.
The Red Team wins the challenge and receives a day at the spa. However, the Blue Team wins the weigh-in. Lizzeth is eliminated.
Everyone tries to resist the temptation to eat a cinnamon bun to get a telephone call. The Red Team wins the performance challenge and receives a gourmet meal from Chef Cruz. Additionally, they force the Blue Team to lose their trainer right before the weigh-in. The Red Team wins the weigh in. Aaron is eliminated.
Dave gives in to the temptation to eat a cupcake and have dinner with a loved one. This week's challenge is to climb 74 flights of stairs. Since Gary and Maurice are injured, Matt and Lisa compete for the Red team against Kelly Mac and Andrea of the Blue Team.
The Red Team wins the challenge by building the tallest food pyramid. They win $5,000 of computer equipment and video messages from home. Andrea becomes the first woman to be the biggest loser of the week. The Blue Team wins the weigh in. Dave is eliminated.
The Red Team wins the life guard training challenge and are treated to new makeovers. Ryan is the biggest loser of the week. The Red Team wins the weigh in. Kelly Mac is eliminated after the Red Team is forced to break a tie between Kelly Mac and Maurice.
It is announced that it is now an individual competition. The two people who have the lowest percentage cumulative weight loss will be up for elimination. The individual spin cycle challenge is won by Gary, who rode for 79 miles. In addition to being immune from the next eviction, Gary also receives a shopping spree and a surprise visit from his wife and kids. Andrea and Maurice are up for elimination, and Andrea is sent home.
The contestants wear their previously lost weight in vests. They run a lap around the track two times. After the second time, whomever could get closest to their first time around wins immunity and a 32" LCD TV. Ryan wins the challenge. Lisa and Maurice are up for elimination, and Ryan turns against his former teammate and is the tie-breaker vote to eliminate Lisa.
A recap of the first eight episodes.
The prize for the weekly challenge is a $7,000 treadmill. There is no immunity. The contestants stand on bales of hay holding a bouquet of balloons. Ryan wins the treadmill. Maurice and Kelly are up for elimination. Maurice is voted off, leaving Kelly, Gary and Ryan in the final three.
The final three are at home trying to avoid real temptation in the real world. Struggling without the support of their trainers and teammates, Kelly, Ryan, and Gary wonder whether everyone else has had so much trouble back at home, but all are determined to keep up with their diets in order to become the winner of the show.
For the reunion show, the 9 non-finalists compete for $100,000. Each is dunked in the water tank to check their fat loss and weighed.