Three kids and 15 adults begin their weight-loss journeys in the Season 14 premiere. Trainer Jillian Michaels also returns to the show.

The players push themselves during exercise sessions at outdoor gyms set up by the trainers; the adults receive health assessments; the NFL's Antonio Gates encourages the contestants during a football-theme challenge; and the kids take a fitness test.

The players take a trivia test focusing on childhood obesity, and the losers must spend hours in a room with junk food, soda and video games; Dr. Dolgoff visits Sunny, Lindsay and Biingo's homes to help improve their families' eating habits; and the contestants race through a bubble-gum pit during a challenge.

The contestants are on their own this week when trainers Bob, Jillian and Dolvett leave town to surprise kid participants Biingo, Lindsay and Sunny and their families with a visit to their hometowns. Some players struggle without their trainer, but others rise to the occasion, and an unexpected leader emerges. In honor of this week’s "Pay it Forward" theme, contestants run a 5K and money is donated to a local Boys and Girls Club, with the winning team earning $15,000 to split among themselves. The trainers plan special surprises for each kid in their hometown before returning to the ranch in time for last chance workouts, when Jillian has a run-in with a player on another trainer’s team. Later, the weigh-in brings welcome news to one player who has been struggling, before another player is sent home.

This week kicks off with the players returning from a workout, only to find that the kitchen and refrigerators are empty. Tasked with trying to affordably stock the kitchen with a week’s worth of healthy food, the contestants race against time to make healthy purchases within their budget at a grocery. Later, one contestant struggles to keep trying her best despite weight loss setbacks, while Dr. H and one of the trainers help a contestant realize the importance of addressing the emotional issues that contribute to weight gain. Trainers Bob, Jillian and Dolvett skype with kid participants Biingo, Lindsay and Sunny, and then a swimming challenge puts the players to the test as they compete for one of the most coveted prizes of all. Finally, a tearful elimination sends another player home.

It’s the halfway point in the season, and the contestants find out that the weight of only one player on each team will count this week, but they won’t know who it will be until the weigh-in. With this week’s theme of “Leading by example,” trainers Bob, Jillian and Dolvett skype with kid participants Biingo, Sunny and Lindsay, and motivate each one to do just that. While Sunny creates a circuit training routine for her fellow classmates, Biingo tries to recruit more friends to his after-school sports club. Lindsay gives an anti-bullying speech to her peers, joined by special guest Cody Simpson, who also talks about his experience being teased before performing for the kids. The adult contestants compete in a crazy challenge requiring them to avoid three swinging pendulums while walking on a balance beam to retrieve calorie-coded plates matching five specific dishes.

It’s halfway through the competition, and the remaining eight players go to singles this week. The contestants face their first temptation in honor of Valentine’s Day, featuring favorite Valentine’s Day treats and the promise of the winner getting a weigh-in-advantage for themselves and a friend. Meanwhile, the trainers continue to motivate the kid participants to stay active and work toward their goals at home. Jillian arranges for Sunny to take a Bollywood dance class, Dolvett motivates Lindsay to attend a cheerleading practice, and Biingo anxiously waits for news from the doctor about whether he’ll be able to start practicing for the youth baseball league tryouts that Bob set up for him. Back at the ranch, one player displays an amazing act of kindness, and another has an emotional, heart to heart talk with a trainer about the circumstances leading to his weight gain.

The players work together to lose 70 pounds in order to win immunity for all; the kid participants are tested in a pop challenge; a sand-digging challenge offers a weigh-in advantage; the trainers and players participate in a team-building exercise; Subway's Jared Fogle offers words of wisdom; and Jillian and the kids endorse Seventeen magazine's "Body Peace Treaty.

Two players leave the ranch during a week devoted to facing fears. Others confront fears that include sharks, confined spaces and singing in public. Also, a challenge atop a seven-story building is planned for the contestants. Elsewhere, Sunny has a difficult conversation with her mom; Lindsay learns about the daily life of a diabetic; and Biingo tries to eat vegetables.

The contestants receive makeovers, with fashion guidance from Tim Gunn and new hairstyles from Ken Paves. They then return home to reveal their new looks to friends and family. Meanwhile, the players aim to lose a certain percentage of body weight in order to win immunity for everyone.

Two finalists are named along with the two players who will compete for the third spot in the finale. Also: The contestants pull the weight they've lost up a mountain; the kids and the contestants receive health updates and reflect on their weight-loss journeys.

The winner of the $250,000 prize is crowned in the Season 14 finale, and the eliminated players return to weigh in for the $100,000 at-home prize.

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The teams learn that only one member's weigh-in will count for the week, and the representative is chosen by a roll of the die. Also: The players compete in a water-bucket race; a contestant receives a troubling health update; a player connects with a family member; and one of Season 14's child ambassadors revisits the show.

The contestants bid on gym equipment in an auction. Later, one player discusses her difficult childhood; the contestants contact their family members; and Season 12 contestant Vinny Hickerson makes an appearance.

The contestants must scavenge through a pumpkin patch in search of immunity, but temptations lurk around every corner.

Last season's kid ambassadors Biingo, Lindsay and Sunny return to the ranch and are joined by the White House Senior Policy Advisor on Nutrition, Sam Kass, for a fun cooking challenge with the contestants. Well aware that kids are often the toughest food critics, the red, white and blue teams race against the clock to prepare a nutritious and tasty dish that will be a hit with the kids - and earn the winning team members an incredible prize. Also this week, one team works out with a very special and inspiring group of women who have survived or are battling cancer. Later, it's time for the weigh-in and saying goodbye to another contestant

It's a busy week at "The Biggest Loser" ranch, which kicks off with a fun bouncing ball challenge that will award members of the winning team a welcome cash prize. All of the contestant take an emotional walk down memory lane watching their casting audition videos, reminding them why they are at the ranch -- and how far they've come in just six weeks. Ruben and Dolvett visit music icon and 16-time Grammy Award winner David Foster at his home, where Ruben isn't the only one stepping up to the microphone. And the show's most recent "Biggest Loser" winner, Danni Allen, stops by for lunch and a pep talk with the contestants. Then it's time for another tense weigh-in, where one more contestant will face elimination.

The contestants celebrate Thanksgiving week with a special challenge - racing to load boxes of Thanksgiving food into trucks headed to help tornado victims in Moore, Oklahoma, where one player has a special connection. Members of the winning team are very thankful for their prize - a holiday dinner shared at the ranch with loved ones flown in for the celebration. Emotional reunions follow, as the winning team, their trainer and their family members gather for a Thanksgiving feast and share what they are most grateful for. Also, one player gets encouragement from his trainer to talk to his family about a long-kept secret, and the show catches up with one of season 14's child ambassadors, Sunny, to see how she is doing today. Then it's time for weigh-in and another elimination, which leaves one trainer giving a very tearful and emotional farewell to one of their players.

Alison drops a bomb on the contestants: this week, another person will be going home. Before there's time to freak out, she informs them the one person chosen to go home will represent his or her entire team at next week's weigh-in and take the team trainer home for the week. A massive wheel with the contestants' faces on it is spun and the lucky/unlucky winner is... Jay from the White Team! Although Jillian is less than thrilled to go to Farmington, Missouri for the week, Jay is ecstatic to see his family again. He's greeted by a packed room of friends and family.

The contestants meet in a diner to answer questions about obesity, and the losing team must work in the eatery for a week. Meanwhile, a trainer helps one of the players work through personal obstacles; and a contestant's family get on a healthy track.

The teams are dissolved, and the 10 remaining players compete in an endurance challenge before a double elimination takes place. Meanwhile, the trainers work out with different contestants; and a player struggles with negative thoughts.

The eliminated contestants return to the ranch for a second chance to get back into the competition.

The contestants arrive in Park City, Utah to begin their week of training with Olympic athletes. They meet with Dolvett, who introduces them to eight-time Olympic speed skater Apollo Ohno. Apollo introduces the contestants to the Olympic training center and gives them a few tips on handling the psychological aspects of training.

The contestants meet with stylists Tim Gunn and Ken Paves to get new styles for their new looks.

The stakes are higher than ever when the five final players compete in a "Biggest Loser" first -- a sprint triathlon, requiring them to swim a mile, bike 12 miles and run three miles. The triathlon winner will secure a coveted spot as a finalist, as well as a brand new Ford Fusion. Then it's an emotional trip down memory lane as the contestants watch footage of their journeys with their trainers, and see firsthand how far they've come since arriving on the ranch. Later, it's time for the last weigh-in before the finale, where two players will fall below the red line and go home, and two more will become finalists, joining the triathlon winner to compete for $250,000 and the title of "The Biggest Loser" at the season 15 finale.

In this must-see, exciting live finale, the 15 contestants from this season return for a special reunion and a chance to weigh in one last time - and show America how much weight they've all lost since beginning their weight-loss journeys. Those who have been eliminated will compete for the $100,000 "at home" prize. Then it's the moment viewers have been waiting for, when one of the three finalists will be named this season's "Biggest Loser" and win the coveted grand prize of $250,000.