Eager to transform their lives and bodies, hopefuls audition for "The Biggest Loser." The show is a ratings behemoth — but is it all that it promises?

Doctors weigh in as contestants participate in extreme challenges. While demand for the show continues to soar, misconduct allegations hit the press.

Plagued by explosive scandals, "The Biggest Loser" shutters production. Having gained back the weight, contestants are left to pick up the pieces.