After being sent down to the complicated Rumble Zone, Flying Tigers Inspector Mike (Michael Wong) becomes the leader of a group of undisciplined policemen. Among them, the most troublesome is the rotten ghost Dong (Anthony Wong), who once sacrificed himself to let his gangster friend Roy (Cheung Tsann-Yuk) escape. When Mike first arrived, he suffered all the hardships he led. Roy's confidant Thumbnail (Patrick Tam) took advantage of the escape of the gangster to take the top spot and became the number one enemy in the eyes of Mike and others. Mike developed true feelings for YoYo when he was monitoring Thumbnail while looking for evidence of Thumbnail's crime. Roy, who sneaked back to Hong Kong, learned that Mike had cheated on him, and was furious and wanted to seek revenge on Mike, but he didn't want to be killed by Thumbnail. Thumbnail was furious when he learned of his friend's death, and broke into Thumbnail's lair alone. The criminal police can turn into a beast.