Aerobic instructor Christie Ryder (Lucinda Dickey, Breakin', Breakin' 2: Electric Boogaloo) becomes possessed by the spirit of an evil ninja when she comes to his aid after he was shot down. Dominated by the killer's vicious and relentless rage, she sets out to brutally attack his enemies. Her boyfriend, confused by Christie's changing personality and afraid that he might be her next victim, enlists the help of Yamada (Shô Kosugi, Enter the Ninja, Revenge of the Ninja). In a life-threatening exorcism and ultimate fight to the death, Yamada proves that he is Christie's only chance for survival.