As of July 2026, The Biggest Loser Season 4 aired in 2007 with 15 episodes — streaming now on Amazon Prime Video. Full episode guide and where to watch below.
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The Biggest Loser Season 4

2007 15 Episodes Reality ⭐ 5/10

The Biggest Loser Season 4 has become appointment viewing on and for anyone who enjoys watching people under real pressure. Across 1 season, the show has had time to find its rhythm and keep it. 30 people have weighed in on TMDB, and the verdict leans heavily positive. Watch it for the format — it delivers exactly what it promises. Start it whenever you need something guaranteed to land.

There is a reason The Biggest Loser Season 4 keeps coming up in conversation. What separates The Biggest Loser Season 4 from the rest of its genre is a genuine understanding of what its audience actually wants to watch. The Biggest Loser (season 4) is the fourth season of the NBC reality television series entitled The Biggest Loser. The fourth season premiered on September 11, 2007 with 18 overweight contestants in a weight loss competition for an ultimate prize of $250,000. The Biggest Loser campus was located at California State University Channel Islands in Camarillo, California. Kim Lyons and Bob Harper lead a cast that brings real weight to the material. It was aired in 2007. The Biggest Loser Season 4 understands the difference between manufactured drama and the real thing, and leans on the latter. There is real craft here, even in the moments that do not fully land.

The Biggest Loser Season 4 is impossible to watch casually — expect strong opinions. It stands on its own even without an obvious comparison point. Short enough to finish in a weekend, substantial enough to feel satisfying. Kim Lyons 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 4

🇦🇺 Australia
🇺🇸 United States
🇬🇧 United Kingdom
🇨🇦 Canada
🇳🇿 New Zealand
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🎬 The Biggest Loser Season 4 — Episode Guide

E1
Back to Basics
2007-09-11
The contestants start off their weight-loss journey by being dropped off in the middle of the desert, while their trainers standby about a mile away from them. The first two to reach their trainers will become the team captains, allowing them to pick their five teammates. However, this means the six...
E2
The Secret Black Team is Revealed!
2007-09-18
Bob and Kim prepare their teams for this week's challenge: racing up the stairs of a 10-story building. With immunity as the prize, both teams will have to do their best. Meanwhile, the secret black team, trained by Jillian Michaels, is finally revealed to the other contestants, who will join them i...
E3
The Pressure of Temptation
2007-09-25
When the teams are put in a room full of tempting, unhealthy foods, they will have to decide in four minutes if it is worth it or not to eat the most calories in order to win a three-pound pass which can be used to their advantage at the weigh-in. In the challenge, the contestants will compete in th...
E4
Bidding Wars
2007-10-02
Another food temptation this week puts the trainers to the test instead of the contestants. Should Bob, Kim or Jillian give in to the temptation, it will give their team a 15-second advantage in the physical challenge. The challenge consists of the contestants running up and down a hill to reach the...
E5
Surprise Getaway
2007-10-09
Alison surprises all three teams with an exotic getaway vacation, but they soon learn that they will be faced with temptations and challenges unlike any they have faced at the campus. Later, after the weigh-in, those who lost will try to forge an alliance with the others before deciding who to vote ...
E6
Lively Beach Competition
2007-10-16
E7
Weigh-In Shocker
2007-10-23
E8
Most Emotional Elimination So Far of the Season
2007-10-30
E9
Biggest Losers Go Green
2007-11-06
E10
A Taste of Home
2007-11-13
E11
Memorable Makeovers
2007-11-20
E12
Viewers Choose the Challenge
2007-11-27
E13
A Slice of Temptation
2007-12-04
E14
Five Remaining Players Compete for Spot on Finale
2007-12-11
E15
"Biggest Loser" Revealed in Season Finale!
2007-12-18

🎭 Cast of The Biggest Loser Season 4

KL
Kim Lyons
Trainer
Bob Harper
Bob Harper
Self
Alison Sweeney
Alison Sweeney
Self - Host
Jillian Michaels
Jillian Michaels
Self

📋 All Seasons of The Biggest Loser

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