Fresh from a prison term, a former Triad boss resides in a hotel in Macau, where he befriends its owner and her young son.
A Hong Kong policewoman, Carmen, returns from England and goes undercover as a dancing girl to infiltrate a ruthless criminal group led by the mean-spirited Ma Liang and his fiery new recruit, Chiang. As she gains Chiang's trust, risking her life in intense hand-to-hand combat, he begins to suspect her true motives after a series of botched crimes.
A beautiful stranger, Yan-Hong (who is one of the Roses), wanders into Inspector Liang's office, takes her gear off, then turns him into a zombie-servant of the Evil God. Policeman Cheng tries to get his wife, who is also an Inspector and his boss, in the mood for sex, but she handcuffs him and walks off. Ah-Kong and his sister, Sao Mui, are out for a stroll. Ah-Kong is also trying to stop his lovely wife Mannie from posing for nude modelling. Yan-Hong is arrested by Cheng and is interrogated, then she reports to her superior, the leather-clad Dai-Jeh ("Big Sister"), who practices her evil laugh and hands out a whipping as punishment. Later, a dozy Taoist priest is called in to exorcise the Beauty and her Evil Roses. The priest fails, but lays the groundwork for the final showdown between good and evil.
Hung is disappointed when her man, Yuk Lung, becomes engaged to pretty Pai Lin. Hung and her scheming mother engage a sorcerer, Ko Yin Yau, to place a spell on him. Yuk Lung becomes possessed by the Adultery Ghost, and he leaves Pai Lin in the middle of having sex with her, going to Hung. Pai Lin and her friend Nancy rush to Thailand, seeking the help of another sorcerer, Simol. The title alludes to the battle of the two spell-casters, through their two hosts. Along the way, plenty of excuses are found to get all the clothes off a number of lovely young women.
Wutung a sex demon returns in another body where he falls for the mortal girl Hsiao-yen, but heaven thinks otherwise with the girl being burned at the stake and her soul being incarnated in the just born Fang Yu-yin. Anger fills Wutung, and to stop this vengeance the town near his lair promise to offer him a virgin girl at the end of every month to become his sex slave. Ya-Yin is selected; however her lover rescues her from the clutches of Wutung. So Wutung sends his demon concubine to get her back, and to cause havoc on the village for the interference.
The ghost of a murdered (beheaded) woman recruits other creatures of the night to join her crusade against the ancestors of the man who killed her. Mindless, low-budget thrill show with vampires, zombies and ghosts attacking lots of victims. Eventually, the exorcist priests (Kara Hui, Ku Feng) find ways of exterminating the various supernatural entities