Michelle Aguilar

The contestants get to bid on the percentage of body weight they think theyll lose this week, and the highest bidding team can win $10,000 -- but only if they reach their weight loss goal. Then its off to a wild sprint and slide challenge, with the winning team earning a phone call home. Later, Chef Rocco DiSpirito drops by to teach the contestants how to shop for and make healthy, tasty and affordable meals before an elimination round sends another team packing. Alison Sweeney is the host, and trainers Bob Harper and Jillian Michaels also star.

America's vote is revealed and the third finalist is announced; one of the finalists is named this season's "Biggest Loser"; a sneak preview of season seven.

This week, the contestants take a road trip to one of the most beautiful places in the world - the Grand Canyon! On the way there, they stop by a convenience store for a temptation challenge with host Alison Sweeney that will provide the winning team a much more luxurious trip for their scenic getaway. Once they arrive at the Grand Canyon, they have to figure out how to work out with no gym and no trainers. Later, the family teams compete for an amazing prize in a kayak challenge on the Colorado River before heading back to the ranch, where medical problems threaten to sideline one contestant. Then a surprise shake-up at the weigh in makes for the most difficult and emotional elimination so far. Trainer Bob Harper and Jillian Michaels also star.

This week, the contestants are left in the dark - literally - during a wild baked goods temptation, with the winner gaining considerable power that could completely change the competition. Later, host Alison Sweeney wakes the contestants up to gather them for the challenge, which will last from sun up to sundown - the longest challenge in Biggest Loser history. One contestant struggles with a decision about whether to stay at the ranch or go home, and then an elimination round sends another contestant packing. Trainers Bob Harper and Jillian Michaels also star.

The contestants get a blast from the past this week with visits from season five winner Ali Vincent and season six winner Michelle Aguilar, both filling in as host while Alison Sweeney is on maternity leave. The contestants are also surprised by the arrival of some old friends, whose return promises to shake up the competition. And while one player is sidelined by medical issues, the rest compete in a balance and endurance challenge that finds each contestant standing on a platform, suspended six feet over a pool. One by one, the lines supporting the platform are removed, making it harder to stand, until only the winner is left standing. Later, Bob has last chance workouts at the beach before the weigh in, which is followed by a surprising elimination. Trainers Bob Harper and Jillian Michaels also star.