第 4 季 共 15 集
播出时间：2007年9月12日
第 1 集 Back to Basics
播出时间：2007年9月12日
The contestants start off their weight-loss journey by being dropped off in the middle of the desert, while their trainers standby about a mile away from them. The first two to reach their trainers will become the team captains, allowing them to pick their five teammates. However, this means the six remaining contestants have to be sent home, but Jillian Michaels returns to let them in on a little secret.
第 2 集 The Secret Black Team is Revealed!
播出时间：2007年9月19日
Bob and Kim prepare their teams for this week's challenge: racing up the stairs of a 10-story building. With immunity as the prize, both teams will have to do their best. Meanwhile, the secret black team, trained by Jillian Michaels, is finally revealed to the other contestants, who will join them in competing for the title of "The Biggest Loser" and $250,000.
第 3 集 The Pressure of Temptation
播出时间：2007年9月26日
When the teams are put in a room full of tempting, unhealthy foods, they will have to decide in four minutes if it is worth it or not to eat the most calories in order to win a three-pound pass which can be used to their advantage at the weigh-in. In the challenge, the contestants will compete in three different 100-meter heats against a yellow team formed by three kids, where the winning team will win a phone call home.
第 4 集 Bidding Wars
播出时间：2007年10月3日
Another food temptation this week puts the trainers to the test instead of the contestants. Should Bob, Kim or Jillian give in to the temptation, it will give their team a 15-second advantage in the physical challenge. The challenge consists of the contestants running up and down a hill to reach their team flag in the fastest time. However, there is one catch: the teams will have to outbid each other with a faster time in hopes that someone will wager lower and lose, which will end up knocking out a team.
第 5 集 Surprise Getaway
播出时间：2007年10月10日
Alison surprises all three teams with an exotic getaway vacation, but they soon learn that they will be faced with temptations and challenges unlike any they have faced at the campus. Later, after the weigh-in, those who lost will try to forge an alliance with the others before deciding who to vote off.
第 6 集 Lively Beach Competition
播出时间：2007年10月17日
第 7 集 Weigh-In Shocker
播出时间：2007年10月24日
第 8 集 Most Emotional Elimination So Far of the Season
播出时间：2007年10月31日
第 9 集 Biggest Losers Go Green
播出时间：2007年11月7日
第 10 集 A Taste of Home
播出时间：2007年11月14日
第 11 集 Memorable Makeovers
播出时间：2007年11月21日
第 12 集 Viewers Choose the Challenge
播出时间：2007年11月28日
第 13 集 A Slice of Temptation
播出时间：2007年12月5日
第 14 集 Five Remaining Players Compete for Spot on Finale
播出时间：2007年12月12日
第 15 集 "Biggest Loser" Revealed in Season Finale!
播出时间：2007年12月19日
