Two sisters, alone on their rural farm, face an unimaginable terror. " Bigfoot ." With the farm isolated and no one else around to help, the sisters must quickly shift from surviving farm life to surviving the fight of their lives.

山葵鲍比空手道馆连锁最差的一家道馆，就是由鲁迪老师（Sensei Rudy，Jason Earles饰）经营的这家山葵鲍比武术学校了，为了提升道馆形象，拯救道馆命运，在道馆学习的这些边缘学生们把刚转学来的新生杰克（Jack，Leo Howard饰）拉进了道馆。而杰克恰巧得到过他爷爷的真传，功夫高强。