This week's episode begins with host Alison Sweeney telling the contestants that they will start competing as individuals now instead of as teams. Then comes the surprise return of all the eliminated contestants, and the revelation that only one will return to the game, and that decision won't be determined by weight loss as in past seasons.

This week's challenge turns into a real nail-biter when contestants have to pick up the pace and stay one step ahead of the competition – literally. Then Ali Vincent, last season's "Biggest Loser" and first female winner, stops by for a pep talk, and brings along a special guest who also has a big surprise for all of the contestants.

After the weigh-in, the players get one last bit of unexpected news – a twist in how this week's elimination will go down. Another contestant is sent home after one player surprises all of the contestants with a shocking vote at elimination.

"The Biggest Loser: Couples" is a production of Reveille LLC, 25/7 Productions and 3Ball Productions. Ben Silverman (NBC's "The Office," "Ugly Betty"), Dave Broome ("A Model Life with Petra Nemcova," "Tsunami Aid: A Concert of Hope"), JD Roth ("Age of Love," "Beauty and the Geek"), Todd A. Nelson ("Unan1mous," "Beauty and the Geek") and Mark Koops ("American Gladiators," "Shear Genius") serve as executive producers.