Fresh out of prison, Isaiah Bone (Michael Jai White) moves to Los Angeles, where underground fights are being held. One night, after watching a match involving local champion Hammerman, Bone makes a deal with promoter Pinball to get him into the fight scene for 20% of his earnings; 40% if Pinball puts his own money on the line. On that same night, Bone encounters mob boss James and his girlfriend Angela Soto. Bone enters his first underground fight and quickly defeats his opponent with only two kicks. Pinball explains to Bone that Angela was previously married, but James set up her husband Danny on a triple-homicide, sending him to jail. When James learned that she was pregnant, he had her undergo an abortion. Since then, Angela has fallen into drug addiction.