一个旅行团正深入泰国一个森林游玩，期间遭到一伙持重型武器的狂徒袭击，原来一个自称“无敌杀手”的歹徒霸占了这座森林，但凡闯入者格杀勿论，只有武艺超强的功夫小子能够摧毁这个罪恶之地。

The policeman Pitak (Jan Janmulltree) switches from a band of thugs. Only the leader (Panna Rittikrai) survived - and vows revenge. With the help of his protégé (Tony Jaa), he sets out to terrorize the cop. Who is now staying with his family: his widowed dad, who is also a policeman, his younger sister Ann and brother Lau. They all float now in mortal danger.