8-9:30 PM · NBC · Returns Sept. 11

''We have our biggest cast ever,'' says exec producer Mark Koops, of the reality weight-loss show's fourth outing. (Can we assume he's talking about the size, not the number, of the contestants?) ''And Jillian Michaels, who was one of the main trainers the first two seasons but not there last season, is back with her abrasive attitude.'' As for the contestants: ''They see the workouts on TV, and then when they go through them, they realize how tough it is.... We also have a Hurricane Katrina victim who's been in seven different states and eight different homes. She says there were days she woke up and wished it had taken her instead of her house.''

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