在这部美国忍者4：歼灭动作/剧情片中,Sean作为中央情报局的成员，他奉命调查一件案子。随着案件的发展，他也开始慢慢陷入危机，在纽约这座大都市里，一群忍者的暗杀计划也逐渐浮出水面……Sean可以查出真相吗？
CIA agent Sean Davidson and his sidekick Carl are sent into the stronghold of sadistic British ex-soldier Mulgrew to rescue some Delta Force commandoes who have been captured and tortured. When Sean, Carl and pretty doctor Sarah run into some problems, Peace Corps vet Joe Armstrong is lured out of retirement to stop Mulgrew's plan to explode a nuclear device in New York City.
