The Kids Return on the Next BIGGEST LOSER on NBC

Related: THE BIGGEST LOSER, NBC, Reality TV

Kid participants Biingo, Lindsay and Sunny return to the ranch, two contestants clash in a big way, and The Players are tasked with a an arduous challenge to try and win immunity for all in a lively episode of "THE BIGGEST LOSER: Challenge America," airing Monday, February 18 (8-10 p.m. ET) on NBC.

The week kicks off with the news that the seven remaining contestants can win immunity for all if they lose a collective 70 lbs. Helping them with that daunting task are kid participants Biingo, Lindsay and Sunny, who surprise the adult contestants by returning to the ranch. A pop challenge testing the kids' brains and brawn will give the adults a chance to shave as many as 10 pounds off the total amount of weight they need to stay at the ranch another week.

But with emotions and tensions at an all-time high, this week's theme of "working together" might be a tougher challenge than losing the amount of weight that will keep them all safe for another week. Two contestants clash and one refuses to work out in the same gym as the other. And Jillian grows increasingly frustrated with one player for the negative thought patterns that keep holding her back.

An exhausting sand-digging challenge at the beach offers another weigh-in advantage, but only if they work together to succeed while racing against the clock. And later, the trainers and players scale new heights in an intense team-building challenge, forcing all - including those who haven't gotten along this week -- to rely on and trust one another to succeed. Then a tension-filled weigh-in reveals whether they'll all be safe - or have to send another player home.

Also this week, Subway's Jared stops by with some exciting news about an opportunity waiting for this season's winner, and Jillian and the kids discuss the importance of body acceptance and sign Seventeen magazine's "Body Peace Treaty."

"The Biggest Loser: Challenge America" is a production of Shine America, 25/7 Productions and 3 Ball Productions. Ben Silverman, Dave Broome, Lisa Hennessy, Eden Gaha, Paul Franklin, JD Roth and Todd A. Nelson are the executive producers.