Billy Wong is a New York City cop whose partner is gunned down during a robbery. Billy and his new partner, Danny Garoni, are working security at a fashion show when a wealthy man's daughter, Laura Shapiro, is kidnapped. The Federal authorities suspect that Laura's father is involved with Mr. Ko, a Hong Kong drug kingpin, so the NYC police commissioner sends the two cops to Hong Kong to investigate.

Lam, a cop approaching 40 but without much accomplishment, always wants to achieve something memorable before his retirement. He is obliged by his sister to find a decent Chinese girl for his nephew, Baffalo, who is an "American Born Chinese". But Baffalo has an eye for a sweetie, Ellen, who has accidentally witnessed a murder. The incident gets Lam, Baffalo and Ellen being involved in a ruthless underground arms smuggling ring, wich sends the killer to eliminate them.

King-sized martial arts hero Sammo Hung stars in this wild and wacky blend of action and comedy. Skinny (Karl Maka) and Fatty (Sammo Hung) are a pair of police detectives who soon find themselves on the outs with their boss when they accidentally make a mess of his wedding while chasing Tak, a big league drug trafficker. Skinny and Fatty are forced to leave their jobs, but while on holiday in Singapore, they forget their troubles when they both find love with beautiful women. However, Tak is convinced the former cops are still a threat, and when he abducts their girlfriends, Skinny and Fatty swing into action to rescue them.