This season's family theme finds husbands and wives versus their adult children. The contestants receive a surprise at home when trainers Bob Harper Jillian Michaels show up in their home, which is followed by their first challenge, an extreme walk uphill in excruciating heat.

Rocco DiSpirito gives away some secrets on creating healty yet affordable meals. Meanwhile, the contestants must determine what percentage of weight they will lose during their stay on the show. The winners of the challenge will receive a phone call home.

The contestants are taken for a road trip to the Grand Canyon, along with a temptation challenge at a convenience store. While at the landmark site, the contestants must figure a way to work out since there is no gym nearby. The families compete in a kayak challenge for prizes, and one member will need help from the medical staff by the end of the trip. The weigh-in proves to be a surprise shake up and cause a difficult elimination.

Part 1 of a 2 part episode finds one contestant being rewarded with a trip home for a visit, as the others are set to spend 24 hours with a personal trainer. Meanwhile, the teams are given an endurance challenge, in which one team is chastised for slacking off.

The conclusion finds that some of the contestants have picked up the pace of their workout to please their trainer. Later, a contestant confides in a trainer about her family issues.

This episodes temptation test involves the contestants being left in the dark with fresh baked goods, with the winner receiving considerable power which may change the face of the game. Later, the contestants are challenged to the longest test yet, from sunup to sundown. Then, one contestant has a choice to make on whether to stay or leave, followed by another being eliminated.

The teams are put through the most unusual workouts yet and receives their six week reports by Dr. Huizenga. Then, a challenge on a balance beam rewards the winner with something special from home.

The contestants are given a quiz which deals in calories with the winner receiving an advantage towards the next challenge. Later, a pair of contestants have an argument just before the challenge, and one contestant sets the record for weight-loss.

This week finds the teams broken up and the contestants will now work as individuals. Later, all the previously eliminated contestants make a return to the ranch. Allison Vincent, last seasons winner also makes a surprise appearance. Plus, the elimination round is given a new twist.

The contestants take a step back to the 1980's as they dress the part and will be using an 80's style workout. A pair of contestants refuse to talk with each other which causes friction within the house and between one team. Then, an emotion goodbye sees another contestant eliminated.

The contestants will be put through an NFL style workout with the help and inspiration from Jerry Rice and Steve Young. Later, Rocco DiSpirito illustrates how Thanksgiving meals can be altered and still taste great, and the players receive videos from home.

Project Runway champ Christian Siriano assists the contestants with Wardrobe as they receive a makeovers, followed by an appearance on the Tyra Banks Show, where their loved ones await them. Back at the ranch, one contestant has a breakthrough.

The remaining four will be trying on their old clothes for a fitting and view a video of highlights for the season with their trainers. Later, the contestants are challenged to wear clothing which matches their current weight loss. Following the weigh-in, the final two contestants which fall below the yellow line plead to be named the third finalist by the viewers.

The sixth season finale finds the eliminated contestants gathering for a final weigh-in and compete for the $100,000 at home prize and the third finalist is chosen before revealing this season's winner.

It's makeover time! Pampering, transforming, restyling - the makeover special will amaze the contestants when they discover their new looks and show themselves off on the catwalk.