The 4 season of The Ultimate Fighter was broadcast on ESPN from jeudi 17 août 2006 to samedi 11 novembre 2006. It consists of 14 episodes, the first one is called "The Comeback Begins" and the last one "Matt Serra vs. Chris Lytle TUF 4 Finale".
Sixteen aspiring mixed martial artists live together, train together and compete against each other to become the Ultimate Fighter. They receive coaching from UFC champions and contenders in a variety of martial arts including wrestling, boxing, judo, Jiu-Jitsu, karate and kickboxing. The winner receives a six-figure contract from the UFC.