When Jason Dyson refuses to make his prized fighter throw an MMA match, a notorious gangster collects his debt by killing the fighter and kidnapping Jason's daughter. Now he must train a prisoner to endure five consecutive underground fights to save her.

Atletas de élite de EE. UU. y otros países se preparan para luchar contra un intenso circuito de obstáculos. Su objetivo: ganar el premio y alcanzar la gloria.