Sneak Peek: "Biggest Loser"

"The Biggest Loser" returns to NBC 5 this Sunday with a special two hour premiere that features a mix of old and new.

Trainer Jillian Michaels returns to the Biggest Loser ranch.

The hard-nosed trainer took a break from the show to become a parent.

That's given her an even greater appreciation for this season's twist: Incorporating three overweight teens.

The teens won't be traditional competitors.

There will be no weigh-ins for them and no eliminations.

The emphasis is on educating the kids and those around them.

"The Biggest Loser" has its season premiere on NBC 5 Sunday night at 9, before moving into its new home Mondays at 8 the next night.