'Biggest Loser' production temporarily halted after contestants threaten to quit show, report says

There's a big problem on the set of "The Biggest Loser," TMZ reports. Nearly all of the remaining contestants have walked off the show and are threatening to quit after learning about a secret "twist" that could seriously affect their shot at the $250,000 grand prize.

Multiple sources connected with the show tell TMZ the mutiny took place this week  when the losers got word that producers were considering bringing back previous contestants to compete for the grand prize.

TMZ was told most of the current contestants were upset, feeling it was unfair that prior losers would get a second bite at the apple. So they banded together and decided to protest by walking off the show in the middle of shooting an episode.

Sources tell TMZ that show honchos have shut down production for at least a week while they figure out how to handle the situation.

A rep for NBC had no comment on the situation.