Charlie Chan is a boxer who goes to Japan to take on a local hotshot in the ring. A gang of yakuzas pressure him to take a dive, but Charlie beats his opponent senseless instead, resulting in a life-or-death chase in which Charlie and his coach try to escape from the angry gangsters. They are spared by the yakuza boss Yakoda, and their eagerness to impress him leads them to pretend that they are the leaders of an influential triad organization known as the Marlboro Gang. That gang doesn't really exist, and their ruse only leads them to further endangerment after Yakoda is murdered by one of his employees. Yakoda's widow sends their daughter (who speaks Cantonese) to Hong Kong so that she won't be next on the hit list, and Charlie -- still pretending to be a powerful triad gangster -- agrees to protect her. He and his friends must save the girl from assassination attempts and kidnapping along the way, as well as coming to the rescue of Yakoda's widow.

Shop assistant in the electronics store, May Bao (Kent Cheng) - good-natured fat man, always ready to help those who need it. Therefore, he decides to help the new store employee, a fat Shan (Maria Cordero), which the evil boss (Richard Ng) forced to jump on the trampoline to the delight of visitors. His plan fails miserably, and Mai Bao, along with Shan, is fired-but the cheerful Mai Bao is accustomed to seeing positive in absolutely any situation.

In Thailand in the 1950s, Detective Au Wei is shot to death by Cha Tin-Hung in a raid because of Cha's involvement with black market diamonds and jewelery. Wei's daughter Chun Chun swears revenge, helped by Wei's friend Yeh Tai-kor, a professional con-man.

Inspector James Wong, a family guy cop, goes deep into a case and gets involved with a deranged killer. His partner and friend, Inspector Steve Chan, long with a new protégé Porky take over the case and look for Inspector Wong who's "enjoying" the twisted company of the killer. Can Inspector Chan and Porky find Inspector Wong before he becomes the latest victim of the psychotic killer?