Reno receives a video tape as proof that his estranged brother Mitch is still alive, despite being declared dead in Vietnam by the military many years prior. The video tape depicts Mitch competing in a rather sketchy underground cage fighting tournament. Reno decides to enter this strange underground world and investigate his brother's disappearance by posing as one of the fighters. He soon discovers that his brother has been brainwashed, and rescuing him from this dangerous and barbaric lifestyle will not be quite as easy as he once thought.

After having some success in the preliminary rounds of the tournament, Reno begins to make some progress with helping his brother Mitch regain his memory. This becomes easier once he slowly starts having flashbacks of childhood memories of the two. Eventually Mitch joins Reno's side. The two bring down the entire cage fighting circus and those who conduct it, with the help of Bobby Sixkiller and a special task force.