Ninja III: The Domination is a 1984 film directed by Sam Firstenberg, and stars Sho Kosugi as Yamada, Lucinda Dickey as Christie, Jordan Bennett as Officer Billy Secord, and James Hong as Miyashima. Ninja III: The Domination is the third film in a series of Ninja films, the first being Enter the Ninja, and the second being Revenge of the Ninja, which are not directly related to one another in terms of storyline.
A telephone linewoman who teaches aerobics classes is possessed by an evil spirit of a fallen ninja when coming to his aid. The spirit seeks revenge on those who killed him and uses the female instructor's body to carry out his mission. The only way the spirit will leave the aerobic instructor's body is through combat with another ninja.