Bat Girl (Josephine Siao) returns from Singapore to Hong Kong as the singer Barbara to investigate her dad, a trapeze artist’s death. She is orphaned. She stays with her aunt. Her cousin is Sze Wai (Lui Kei), a pulp fiction writer of the superhero, Bat Girl. Encountering injustice, Bat Girl confronts Sze to interrogate about the whereabouts of Wu Wan-Lung (Sek Kin). Bat Girl unites with her friend, Chan Kwong-ying (Lydia Shum). Sze tracks down Bat Girl and is involved in a fight with Lung's marksmen in a nightclub. A private detective, James Bond (Cheng Kwun-Min) helps Lung find Bat Girl to no avail, as she appears in guises. Bat Girl eavesdrops on Lung and realises he was her father's murderer. She revenges on Lung, and a strange female creature (Yung Yuk-yi) appears as the Lung's house's owner. The creature finds that Bat Girl is her daughter. She wrestles with Lung and they are both burnt to death. At last, Sze finds out that his cousin is Bat Girl and they begin a romance.
Josephine Siao Fong-Fong
as Wong Fuk-Mui/Bat Girl/Barbara/woman
Lui Kei
as Sze Wai
鄭君綿
as James Bond
石堅
as Wu Wan-Lung
沈殿霞
as Chan Kwong-ying
金雷
as marksman
Siu Kuk-Hung
as Sze Wai's younger sister
Lok Gung
as inspector
Lai Man
as Sze's mother
許瑩英
as
Yung Yuk-Yi
as Wong's Mother/ strange woman
Chan Siu-Pang
as marksman
