At the height of its mainstream popularity a decade ago and recently troubled by associations with enhancement drugs and early deaths, pro wrestling appears to be on unsteady terrain on which to build a company in 2009. Nashville-based Total Nonstop Action (TNA), however, is a rapidly thriving promotion that is intent on sticking with wrestling and reinvigorating the niche’s landscape. Founded in 2002, TNA’s roster contains a startling array of stalwarts from wrestling’s pop-cultural peak (Kurt Angle, Kevin Nash) and upstarts in their prime (AJ Styles, Homicide). Currently, factions representing the old guard (the Main Event Mafia) and the fresh blood (the Frontline) are at war for total supremacy. As part of this conflict, TNA World Champion Sting versus Samoa Joe headlines Saturday's card. 7:30 p.m. at the Cincinnati Gardens.