Mr. Black is back on the job after the notorious criminal rat One-Ear breaks free, and he puts out an all-points bulletin to catch him. Trouble grows when Dr. Big Ape, a mad ape scientist, sets out for revenge on those who wronged him. Teaming up, the two villains scheme to kidnap the city's citizens and send them off into space using the Emerald Star on its opening day. Backed by his fellow officers and a young pig partner, Mr. Black squares off against his foes in a big showdown over the Emerald Star, in a Chinese action film with a sci-fi twist.