Season
- Season 0 2007-09-04
- Season 1 2004-10-19
- Season 2 2005-09-13
- Season 3 2006-09-20
- Season 4 2007-09-11
- Season 5 2008-01-01
- Season 6 2008-09-16
- Season 7 2009-01-06
- Season 8 2009-09-15
- Season 9 2010-01-05
- Season 10 2010-09-21
- Season 11 2011-01-04
- Season 12 2011-09-20
- Season 13 2012-01-03
- Season 14 2013-01-06
- Season 15 2013-10-08
- Season 16 2014-09-11
- Season 17 2016-01-04
- Season 18 2020-01-28
Season 18 Episode
- Season 4 Back to Basics
- Season 4 The Secret Black Team is Revealed!
- Season 4 The Pressure of Temptation
- Season 4 Bidding Wars
- Season 4 Surprise Getaway
- Season 4 Lively Beach Competition
- Season 4 Weigh-In Shocker
- Season 4 Most Emotional Elimination So Far of the Season
- Season 4 Biggest Losers Go Green
- Season 4 A Taste of Home
- Season 4 Memorable Makeovers
- Season 4 Viewers Choose the Challenge
- Season 4 A Slice of Temptation
- Season 4 Five Remaining Players Compete for Spot on Finale
- Season 4 "Biggest Loser" Revealed in Season Finale!
The Biggest Loser - Season 4 Episode 1 Back to Basics
5.40 90 minutes 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.
