'The Biggest Loser' returns to NBC

(NBC News) - "The Biggest Loser" returns for its 15th season Tuesday night on NBC.

Most of the time the contestants looking to shed pounds are unknowns, but this time around two have
higher profiles.

Holley Mangold, a weightlifter at the 2012 Olympics, and "American Idol" winner Ruben Studdard are both hoping to take home the "Biggest Loser" crown.

One twist has also been added to the show this season.

The trainers each have one "save" they can use to keep a contestant from going home.