Ninja was released in the year 1981。Ninja is also called as Enter the Ninja, Wejscie ninja, Rache des Ninja, die Killermaschine, Ninja I, Justicia del Ninja, Invincibile ninja。

After just completing his training at a ninja school, an army vet (Franco Nero) travels to the Phillippines and finds himself battling a landgrabber (Christopher George) who wants his war-buddy's property. He must also fight his rival (Sho Kosugi).

Ninja actors and actresses include Constantine Gregory, Michael Dudikoff, Susan George。