Officer Chan Ka Kui manages to put a major Hong Kong drug dealer behind the bars practically alone, after a shooting and an impressive chase inside a slum. Now, he must protect the boss' secretary, Selina, who will testify against the gangster in court.

Jackie Chan
as Sergeant Chan Ka Kui

Brigitte Lin Ching-hsia
as Salina Fong

Maggie Cheung Man-yuk
as May

Bill Tung Biu
as Inspector "Uncle" Bill Chou

Chor Yuen
as Chu Tao

Charlie Cho Cha-lee
as John Ko

Lam Kwok-hung
as Superintendent Raymond Li

Kam Hing-yin
as Inspector Man

Mars
as Kim

Kent Tong Chun-yip
as Tak