The Ultimate Fighter Season 1. The show that was pivotal in the survival of UFC. The 1st season was aired in 2005. It was a show that was to unearth new talent for UFC, but having it as a reality show, truly brought attention among viewers to see the drama & the personality behind MMA fighters.
The live finale for the first season saw the historic bout of Forrest Griffin vs. Stephan Bonnar. Now widely regarded as the most influential fight in MMA history, the bout took place in what was the first ever MMA event on live.

How old was you when TUF1 aired?

Related:  Top 10 martial artist in the Marvel universe