The Biggest Loser - Season 5

The Biggest Loser: Couples is the fifth season of the NBC reality television series The Biggest Loser. The fifth season premiered on January 1, 2008 with ten overweight couples competing for a cash prize of $250,000. This season featured Alison Sweeney as the host, with trainers Bob Harper and Jillian Michaels; all three returning from season four. Although the contestants came in as teams of two, the grand prize was eventually awarded to an individual. In the end Ali Vincent won, making her the first female winner in the history of the United States Biggest Loser series.

• S5 E1 - They Got Fat Together, Can They Get Thin Together?

• S5 E2 - Contestants Face Barbecue Temptation and Giant Seesaw Challenge!

• S5 E3 - Tensions Run High As This Week's Challenge Causes Rifts Among Players

• S5 E4 - One Outcast Duo Squares Off Against All the Rest

• S5 E5 - Surprise Escalator Challenge Changes the Game Forever

• S5 E6 - Celebrity Chef Rocco DiSpirito Guest Stars

• S5 E7 - Special Guest Appearance by Jillian's Mom

• S5 E8 - Contestants Reunited With Loved Ones

• S5 E9 - One Team Surprised With Trip to Vegas

• S5 E10 - Contestants Tackle One of the Biggest Challenges in Show's History

• S5 E11 - All Contestants Return to Ranch in Surprise Twist

• S5 E12 - Contestants Made Over by Fashion Guru Tim Gunn

• S5 E13 - Competition Heats Up With Only Six Contestants Left

• S5 E14 - Last Five Contestants Get Surprise Trip to Australia

• S5 E15 - Surprise Game-Changing Twist in Last Episode Before Live Finale

• S5 E16 - "Biggest Loser" Revealed in Season Finale