The Biggest Loser: 12x4
Week 4
Contestants from past seasons return to inspire the current players; after a challenge where the teams battle the elements, the winners receive a special bonus prize; contestants face elimination.
12 - 1Week 1 Sep. 20, 2011
12 - 2Week 2 Sep. 27, 2011
12 - 3Week 3 Oct. 04, 2011
12 - 4Week 4 Oct. 11, 2011
12 - 5Week 5 Oct. 18, 2011
12 - 6Week 6 Oct. 25, 2011
12 - 7Week 7 Nov. 01, 2011
12 - 8Week 8 Nov. 08, 2011
12 - 9Week 9 Nov. 15, 2011
12 - 10Week 10 Nov. 22, 2011
12 - 11Week 11 - Makeover Week Nov. 29, 2011
12 - 12Week 12 Dec. 06, 2011
12 - 13Week 13 - Finale Dec. 13, 2011