North American release. Game developed in Japan. For more information on the game itself, please see the original Japanese release entry; "Ninja Crusaders [Model NES-N4-USA] [Model SAC-N4]".
Description from the back cover:
They struck without warning, wiping out the Earth's defenses in one master stroke. Cities were crushed, and the invading aliens showed no mercy!
A small resistance force of Ninja, refusing to be conquered, still remained to fight the evil Inimicus. A daring plan was devised by the Ancient Ones to send out two special Ninja, and annihilate the alien threat once and for all!