Season
- Season 18 2020-01-28
- Season 17 2016-01-04
- Season 16 2014-09-11
- Season 15 2013-10-08
- Season 14 2013-01-06
- Season 13 2012-01-03
- Season 12 2011-09-20
- Season 11 2011-01-04
- Season 10 2010-09-21
- Season 9 2010-01-05
- Season 8 2009-09-15
- Season 7 2009-01-06
- Season 6 2008-09-16
- Season 5 2008-01-01
- Season 4 2007-09-11
- Season 3 2006-09-20
- Season 2 2005-09-13
- Season 1 2004-10-19
- Season 0 2007-09-04
Episode
- Episode 1: They Got Fat Together, Can They Get Thin Together?
- Episode 2: Contestants Face Barbecue Temptation and Giant Seesaw Challenge!
- Episode 3: Tensions Run High As This Week's Challenge Causes Rifts Among Players
- Episode 4: One Outcast Duo Squares Off Against All the Rest
- Episode 5: Surprise Escalator Challenge Changes the Game Forever
- Episode 6: Celebrity Chef Rocco DiSpirito Guest Stars
- Episode 7: Special Guest Appearance by Jillian's Mom
- Episode 8: Contestants Reunited With Loved Ones
- Episode 9: One Team Surprised With Trip to Vegas
- Episode 10: Contestants Tackle One of the Biggest Challenges in Show's History
- Episode 11: All Contestants Return to Ranch in Surprise Twist
- Episode 12: Contestants Made Over by Fashion Guru Tim Gunn
- Episode 13: Competition Heats Up With Only Six Contestants Left
- Episode 14: Last Five Contestants Get Surprise Trip to Australia
- Episode 15: Surprise Game-Changing Twist in Last Episode Before Live Finale
- Episode 16: "Biggest Loser" Revealed in Season Finale
The Biggest Loser Season 5 Special Guest Appearance by Jillian's Mom
The Biggest Loser features obese people competing to win a cash prize by losing the highest percentage of weight relative to their initial weight.
