The Biggest Loser helped many of its trainers - including Bob Harper and Jillian Michaels - find fame - but where is everyone now following the show's past controversy? NBC's The Biggest Loser, which premiered in 2004, followed a group of people deemed overweight who would compete in a 30-week competition. The goal was to lose as many pounds as possible to be crowned "the biggest loser." The competition series quickly became a cultural phenomenon as viewers tuned in weekly to see Michaels, Harper and later other trainers.