Underground fight clubs have appeared several times in Smallville.
Season Six[]
Clark and Titan battle in the fight club.
Richtor Maddox ran an underground fight club in an abandoned an Air Force hangar that broadcast over the Internet. The alien warrior Titan fought in this fight club, where he was inadvertently killed in battle by the Kryptonian Clark Kent.
Season Nine[]
Mia at a fight club.
Oliver Queen hit rock bottom, and then lost himself fighting in underground fight clubs.
Mia Dearden also fought in an underground fight club, until her pimp Ricky tracked her down.