with 4 episodes premiered on September 4, 2007

with 12 episodes premiered on October 19, 2004

The Biggest Loser (season 1) is the first season of the NBC reality television series entitled The Biggest Loser, which premiered on October 19, 2004. The show features overweight contestants competi… see more

with 12 episodes premiered on September 13, 2005

The Biggest Loser (season 2) is the second season of the NBC competitive reality television series entitled The Biggest Loser. The second season premiered on September 13, 2005, and like season one f… see more

with 13 episodes premiered on September 20, 2006

The Biggest Loser (season 3) is the third season of the NBC reality television series entitled The Biggest Loser. The third season premiered on September 20, 2006 with fifty overweight contestants, e… see more

with 15 episodes premiered on September 11, 2007

The Biggest Loser (season 4) is the fourth season of the NBC reality television series entitled The Biggest Loser. The fourth season premiered on September 11, 2007 with 18 overweight contestants in … see more

with 16 episodes premiered on January 1, 2008

The Biggest Loser: Couples is the fifth season of the NBC reality television series The Biggest Loser. The fifth season premiered on January 1, 2008 with ten overweight couples competing for a cash p… see more

with 14 episodes premiered on September 16, 2008

The Biggest Loser: Families is the sixth season of the NBC reality television series The Biggest Loser. The sixth season premiered on September 16, 2008, featuring Alison Sweeney as the host and Bob … see more

with 21 episodes premiered on January 6, 2009

The Biggest Loser: Couples 2 is the seventh season of the NBC reality television series The Biggest Loser. The season premiered on January 6, 2009, with eleven overweight couples competing for a cash… see more

with 13 episodes premiered on September 15, 2009

The Biggest Loser: Second Chances is the eighth season of the NBC reality television series The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Danny Cahill, the… see more

with 19 episodes premiered on January 5, 2010

The Biggest Loser: Couples 3 is the ninth season of the NBC reality television series The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Michael Ventrella, the … see more

with 13 episodes premiered on September 21, 2010

The Biggest Loser: Pay It Forward is the tenth season of the NBC reality television series entitled The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Patrick H… see more

with 21 episodes premiered on January 4, 2011

The Biggest Loser: Couples 4 is the eleventh season of the NBC reality television series entitled The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Olivia Ward… see more

with 13 episodes premiered on September 20, 2011

The Biggest Loser: Battle of the Ages is the twelfth season of the NBC reality television series entitled The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Joh… see more

with 18 episodes premiered on January 3, 2012

The Biggest Loser: No Excuses is the thirteenth season of the NBC reality television series entitled The Biggest Loser. The contestants competed to win a $250,000 prize, which was awarded to Jeremy B… see more

with 12 episodes premiered on January 6, 2013

The Biggest Loser: Challenge America is the fourteenth season of the NBC reality television series entitled The Biggest Loser. The contestants will compete to win a $250,000 prize, which will be awar… see more

with 15 episodes premiered on October 8, 2013

with 18 episodes premiered on September 11, 2014

with 8 episodes premiered on January 4, 2016

with 10 episodes premiered on January 28, 2020