The Biggest Loser

Eleven family teams of two experience their first challenge - and the first surprise twist of the season.

Contestants get medical tasks from Dr. Huizenga to illustrate the importance of getting healthy.

It's student-teacher week at the Biggest Loser ranch.

Contestants race for immunity at this week's weigh-in.

The blue and yellow teams return to try and win a spot back on the ranch.

Olympians Julia Mancuso, Jeret "Speedy" Peterson, J.R. Celski, Rockne Brubaker and Allison Jones Guest Star in a special Olympic-themed episode.

The game changes to Blue vs. Black teams, and one player controls the fate of all the contestants.

Contestants compete in a truck-pulling challenge.

Favorite chef Curtis Stone Guest Stars.

The contestants head home and get warm welcomes - and a surprise bike challenge with a cupcake twist!

The eliminated contestants return to vie for a spot back in the game.

With immunity at stake, the competition heats up.

Financial guru Suze Orman and Season 8 Winner Danny Cahill Guest Star.

Volleyball superstar Gabrielle Reece Guest Stars.

The final seven contestants head to Dallas, and popular Season Eight contestant Abby Rike guest stars.

Singing superstar Ashanti and celebrity stylist Jonathan Antin guest star in the popular makeover episode.

Dallas Cowboys quarterback Tony Romo guest stars, along with Season Seven winner Helen Phillips and Season Three winner Erik Chopin.

The final four contestants face their toughest challenge yet -- running a marathon -- while being cheered on by Season 5 winner Ali Vincent, Season 2 winner Matt Hoover, and Season 7 contestants Mike Morelli and Sione Fa.

"The Biggest Loser" revealed in the exciting Season Finale!