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In this must-see, exciting live finale, all of 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. There are four contestants left, but America has voted on the two that fell below the yellow line in last week’s episode to choose who will be the third finalist in the game. After America’s vote is revealed and the third finalist is announced, the eliminated player will then weigh in with the other 12 eliminated contestants to compete for the $100,000 “at home” prize. And for the first time ever, America will also get to choose between two people to decide which one will be a contestant on the next season of “The Biggest Loser.” Then it’s the moment viewers have been waiting for, when one of the three finalists will be named this season’s “Biggest Loser” and win the coveted grand prize of $250,000. Alison Sweeney is the host, and trainers Bob Harper and Jillian Michaels also star.

In part one of this week’s two-part challenge, contestants divide the amount of weight they'’ve lost so far among their opponents, with many ganging up on the player they feel is the strongest competitor. For part two of the challenge, the players head to the racetrack where they'’ll meet NASCAR driver Clint Bowyer. Then each contestant will pull a two-ton car plus the weight added on from part one of the challenge -- for almost a quarter of a mile! Also, the competition goes to singles this week and contestants are given their original colored shirts to wear for the rest of the competition. And later, one contestant breaks “Biggest Loser” records at a weigh in that finds several players hitting big milestones. Alison Sweeney is the host, and trainers Bob Harper and Jillian Michaels also star.

Season 7 begins by introducing the players, who will compete in pairs. Grandparents, best friends and former plus-size models are among the twosomes. The group also boasts the oldest contestants and the heaviest contestant in the show's history.

This week, the contestants hike up a hill to find over 100 keys, but only two teams will find the keys that unlock the Biggest Loser gym. The rest of the teams have to learn to creatively work out all week without the use of the gym. Later, a rowing machine challenge pits team against team, and then a surprising turn of events leads to one contestant heading home. Alison Sweeney hosts the series, and Bob Harper and Jillian Michaels also star.

The players encounter temptation, forcing them to assess why they've come to the ranch. Later, they compete in a race for immunity and a phone call home, and Bob clashes with a contestant during the last-chance workouts.