The movie opens in ancient times when a warrior Tong Lee (Eric Lee - Ring of Fire) is fighting against the Master Demon (Gerald Okamura - Big Trouble in Little China), who stabs Tong Lee, but the warrior manages to kill him and make off his his dismembered hand to a Shaolin temple, where the monks put some sort of seal on it, to prevent him from rising again. A thief steals the box where the Demon's hand is sealed, and someone conjures up a Demon woman named Medusa, who kills everyone in her path to get the box, until it lands in the hands of a chap named Campbell, a private detective. Campbell's flat gets overrun with Ninja as Medusa releases the hand. When the remains of the hand are stolen, the stage is set for a climactic martial arts battle.