A young beautiful woman goes undercover into a wealthy powerful crime family to investigate and avenge her younger sister's tragic death.
Cut-and-paste transformation of Taiwanese movie "The Anger" a.k.a. "Shi Jie" (original title; 1982) directed by Richard Chen Yao-Chi with new Hong Kong footage.

"Evil ninja leader Victor steals the coveted black ninja warrior from Charles but gets wounded in the process. Taking refuge at his friend Roger's house, his authority is challenged by a young man named Jimmy who has come to avenge his father's murder. Victor sends his henchmen after Jimmy, however Charles comes to his aid. Together, the two team up in order to retrieve the black ninja warrior and achieve the ultimate revenge." - VHS Back of the box description. A Hong Kong cut and paste edit of the 1983 Thai Film "เหยี่ยวดง" (Forest Hawk) with new ninja scenes.

The Ninja Empire has been run by an evil master and one member decides to leave the empire. The ex-Ninja wants a Hong Kong detective to track down the new leader and end his reign of terror. "Cut-and-paste" transformation of Taiwanese movie "To catch a thief" (1984; directed by Gam Ming) with new Hong Kong footage.

Gordon Anderson (CIA. Ninja. Ninja Hunter) must face his toughest challenge yet when King Ninja steals a top secret formula known as DAK10 that can activate the desire to kill... Hong Kong cut and paste edit of the 1983 Taiwanese Film "錯誤的腳步" (The Wrong Steps) with new ninja scenes.

Mark, a local cop, is investigating a string of jewel robberies. He soon discovers that the men behind the crimes are the notorious"Red Devil" and his band of Ninjas. Mark teams up with Billy, a man out for revenge.