Fatty and Baldy, a pair of undercover detectives, infiltrate a Triad drug syndicate but are put on a leave of absence after apprehending the kingpin, Tak, in the middle of the police commander's wedding. They return to find that Tak has been bailed out and has hired a team of assassins to exact revenge.

The "Five Lucky Stars" attempt to help a restless ghost take revenge on the evil drug gang who took his life. At the same time, they want the ghost to help them get rich and court the four policewomen assigned to the case.

Wong Fei Hong (Wong Kwan) must fight against slave trader Master Eleven (Ji Chun Hua) and Prefect Wu to stop the Chinese being sold as slaves work in the gold mines in America.