A criminal gang uses a giant robot, Pioneer 1, to perform daring smash-and-grab raids on the city's banks. The police are hopeless, and the one man who has a clue (John Shum) is being marginalized in the department because his work makes the other cops look bad. He runs into a former member of the gang (Hark), the two become friends, and soon they're being chased by Pioneer II -- a robot that looks exactly like Hark's old childhood friend Maria (Sally Yeh), who now happens to be one of the gang leaders. If this sounds complicated, don't worry -- the plot is secondary to wild, inventive imagery, kung fu, things blowing up, and a climactic fight that is straight out of all your giant-robot wet dreams.