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- 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 1 Episode 1: Pilot
- Season 1 Episode 2
- Season 1 Episode 3
- Season 1 Episode 4: Red and Blue Teams Go to New Heights
- Season 1 Episode 5: A Team Lightens Up Through Elimination
- Season 1 Episode 6: Teams Trek to the Beach for a Challenge
- Season 1 Episode 7: Biking Challenge
- Season 1 Episode 8: Playing It Close to the Vest
- Season 1 Episode 9: A Look Back Special
- Season 1 Episode 10: Final Weigh-In At The Ranch
- Season 1 Episode 11: Season Finale
- Season 1 Episode 12: It Isn't Over Until It's Over
The Biggest Loser - Season 1
5.42 90 minutes The Biggest Loser features obese people competing to win a cash prize by losing the highest percentage of weight relative to their initial weight.
