Ninja I was released in the year 1981。Ninja I is also called as Enter the Ninja, Wejscie ninja, Rache des Ninja, die Killermaschine, Ninja, 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 I actors and actresses include Constantine Gregory, Michael Dudikoff, Susan George。