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2005 • 11 Episodes
Season 1 of The Biggest Loser premiered on October 6, 2005
2006 • 12 Episodes
Season 2 of The Biggest Loser premiered on October 11, 2006
• 39 Episodes
Season 3 of The Biggest Loser premiered on January 1, 1970
2011 • 8 Episodes
Season 4 of The Biggest Loser premiered on January 10, 2011
2012 • 9 Episodes
Season 5 of The Biggest Loser premiered on January 3, 2012