Rural kung fu whiz Qiang travels to the big city to visit his friend Lung, who's taken up Xanda, a new martial art that fuses multiple styles. When Lung is grievously wounded by the Xanda champ, Qiang trains in the sport to seek revenge in the ring.

A gang of criminals terrorizes Hong Kong with two killer robots, one of which is modelled on the gang's female thug, Maria. When the robot gets damaged during a mission, an inventor working for the police captures and reprograms her to develop an independent personality.