The Biggest Loser is an NBC reality television show that began broadcasting on October 19, 2004. The series is currently airing its fifth season which began on January 1, 2008 and NBC are currently casting for a sixth season.

The Biggest Loser is an Australian reality television show, based on the original American version of the same name. It is produced by Crackerjack Productions and screened on Network Ten. It is hosted by Ajay Rochester and first debuted on 13 February, 2006, followed by a second season on 4 February, 2007. A third season is currently in production, and began airing on 3 February, 2008.