As of July 2026, The Biggest Loser Season 1 aired in 2004 with 12 episodes — streaming now on Amazon Prime Video. Full episode guide and where to watch below.
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The Biggest Loser Season 1

2004 12 Episodes Reality ⭐ 5/10

Right now you can watch The Biggest Loser Season 1 on and — and it is more addictive than the premise lets on. The 1-season run is exactly the right length for what it is doing. A 5/10 rating says what the writing already makes obvious: this one works. Bob Harper anchors the format, but the whole cast makes it watchable. There is no real reason to keep putting it off.

Part of the current wave of titles people are actually watching, The Biggest Loser Season 1 earns its spot. The production behind The Biggest Loser Season 1 knows exactly which moments to let breathe. The Biggest Loser (season 1) is the first season of the NBC reality television series entitled The Biggest Loser, which premiered on October 19, 2004. The show features overweight contestants competing to lose the largest percentage of their body weight and receive the title of 'Biggest Loser,' along with a $250,000 grand prize. The first season featured twelve contestants divided into two teams of six players. Bob Harper and Caroline Rhea lead a cast that brings real weight to the material. It was aired in 2004. The Biggest Loser Season 1 understands the difference between manufactured drama and the real thing, and leans on the latter. It delivers reliably on what it promises, which is more than most of its competition manages.

The Biggest Loser Season 1 is impossible to watch casually — expect strong opinions. If you have run out of similar titles to watch, this is a strong next pick. It is a manageable watch, easy to fit into a single week. Bob Harper is a big part of why it works, but the format itself is the real star. The kind of thing that generates strong opinions in every room it is watched in.

📡 Where to Watch The Biggest Loser Season 1

🇦🇺 Australia
🇺🇸 United States
🇬🇧 United Kingdom
🇨🇦 Canada
🇳🇿 New Zealand
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🎬 The Biggest Loser Season 1 — Episode Guide

E1
Episode 1: Pilot
2004-10-19
In a life-altering competition, contestants use medically approved weight-loss techniques to shed pounds and try to win a $250,000 prize. The twelve players are seperated into teams - red and blue - and in the first challenge, pulling a heavy car across a track - the Blue Team prospers, but despite...
E2
Episode 2
2004-10-26
After a tough elimination, the Blue Team gets back into the game on the second challenge, a bake-off which will determine the winner of a luxorious spa visit. The catch is that if any player takes a taste of anything they bake, 50 percent of all profits their team made is not counted. At the end o...
E3
Episode 3
2004-11-09
The Red Team and the Blue Team are forced to go onstage and perform about their feelings on their weight and weight-loss. The winner, decided by the audience at the nightclub which the players performed at, is the Red Team, who is given a reward. Later, even with the Blue Team training as hard as ...
E4
Episode 4: Red and Blue Teams Go to New Heights
2004-11-16
""Red and Blue Teams Go to New Heights"" - Blue Team trainer Bob Harper seems surprised after Aaron's ouster the night before. Things move on at the ranch, and after a workout, the players find a giant mountain of cupcakes in the house, with a note saying that whichever player eats the most cupcak...
E5
Episode 5: A Team Lightens Up Through Elimination
2004-11-23
""A Team Lightens Up Through Elimination"" - After Matt's elimination Ryan realizes that Dave has been lying to him and the girls of the Red Team for the entire game. The challenge of the week is a food stacking competition - where team members must build their stack the highest using only their m...
E6
Episode 6: Teams Trek to the Beach for a Challenge
2004-11-30
""Teams Trek to the Beach for a Challenge"" Rumours and suspicions fly after a tense previous elimination, where the women in the house assumed that the men were trying to pick them off. Players are just starting to get on each other's nerves: Maurice's lack of work ethic angers his team - and his...
E7
Episode 7: Biking Challenge
2004-12-07
""Biking Challenge"" Contestants race to log the most miles on a stationary bike before midnight, with a prize of better-fitting clothes as an incentive; participants learn of a new twist in the game.
E8
Episode 8: Playing It Close to the Vest
2004-12-14
The contestants are given an overwhelming surprise when they come face-to-face with their old, bigger, selves - cardboard cutouts as they apperaed the first day they arrived. The players run around a track with a weighted vest carrying the weight that each has lost so far. Ryan comes closest to his ...
E9
Episode 9: A Look Back Special
2004-12-21
""A Lighter Side"" An often-comic look at the first eight episodes; previously unseen footage of contestants' exit interviews; bloopers; the contestants who cheated when they thought the cameras were out of range.
E10
Episode 10: Final Weigh-In At The Ranch
2005-01-04
""Final Weigh-In at the Ranch"" It's payback time as the contestants turn the tables and ""train"" the trainers. This episode is the final weigh in at the ranch, preceded by the contestants reflecting on this journey that has changed their lives, and followed by a vote to trim the players' numbers ...
E11
Episode 11: Season Finale
2005-01-11
After weeks of training and careful eating tactics, the ""Biggest Loser"" is finally chosen, as the season finale comes about. The winner is decided during a live portion of the episode.
E12
Episode 12: It Isn't Over Until It's Over
2005-01-18
In this post-finale special, viewers discover more about the contestants' lives and competitive drive, including that of the Biggest Loser. Another weigh-in will take place, and one of the nine remaining contestants (less than third place) will win $100,000.

🎭 Cast of The Biggest Loser Season 1

Bob Harper
Bob Harper
Self
Caroline Rhea
Caroline Rhea
Host
Jillian Michaels
Jillian Michaels
Self

📋 All Seasons of The Biggest Loser

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