Angelo only lives for Thai boxing. Unjustly excluded from the championship, he accidentally kills his challenger in a street fight. When he's released from prison six years later, he is a shadow of his former self. Then one day, Moise, a childhood friend, introduces Angelo to Marcus (Renaud), a bar owner and illegal fight organiser. In the same night he meets Virginie (Rocher), a waitress, and for Angelo it's love at first sight. However, Virginie has been paid to pay him attention and, when he find's out, it's a blow like no other. Now he will change, he has nothing left to lose. He will become someone else. He will become a machine, the meanest, hardest man alive. Hit and get hit, unrelenting and without mercy. He will become the Scorpion