While visiting old friend Frank Landers in the Philippines, Ninja master Cole (Franco Nero) is approached by villain Charles Venarius (Christopher George). Venarius tries to force Cole into turning against his friend so Vanarius can take over his plantation. When Cole refuses, Venarius brings in his own Ninja Hasegawa (Sho Kosugi), leading to non-stop Ninja-fighting action, ending in a stupendous climax. Containing superb stunt choreography, the film was spawned the sequel "Revenge of the Ninja."