The Biggest Loser kicks off Season 12 on Tuesday, September 20th (8:00 - 10:00 p.m. ET) with two new trainers - Anna Kournikova and Dolvett Quince - joining Biggest Loser favorite Bob Harper and 15 contestants competing in a "Battle of the Ages" that will group contestants by age for the first time ever in the history of the show.

On the player's side, there will be three teams of five divided by age: the youngest players (all under 30), the middle players (ages 30-49) and the older players (ages 50 and over). The Season 12 contestants range in age from 24 to 65. In the premiere, host Alison Sweeney tells the teams that they will make their first game-changing decision - who their trainer will be - in the order in which they finish the first challenge. They can choose longtime Biggest Loser trainer Bob Harper, or one of the two new trainers - internationally recognized tennis star and certified trainer Anna Kournikova or top fitness expert Dolvett Quince.

Once each team chooses its trainer, the "Battle of the Ages" begins! And past seasons of the show - with a previous winner who was 48 and an at-home winner who was 64 - have proven that The Biggest Loser is anyone's game to win, regardless of age.

The new contestants include Vinny, who overcame a difficult childhood to become a successful Nashville recording artist; Antone, a 447-pound father of four and former NFL player for the Philadelphia Eagles and Atlanta Falcons; and Jennifer, a television producer who has accomplished every goal she has set for herself except one - losing weight. Viewers will also meet Jessica, a travelling registered nurse whose long work shifts make it more challenging to eat healthy; Patrick, who wants to lose weight to pass the physical agility test required to pursue his dream of being a police officer; and Bonnie, a 63-year-old grandmother of six who lost her home to Hurricane Katrina and lost her husband not long after.

The Biggest Loser is a production of Reveille, 25/7 Productions and 3 Ball Productions. Ben Silverman, Dave Broome, JD Roth, Todd A. Nelson and Todd Lubin are the executive producers.