Long ago, a band of great Iga Ninja warriors witnessed a flash in the sky as a giant ball of fire crashed into the distant forest. Rushing into the deep woods out of curiosity, they are stunned to find new enemies. Never-seen-before creatures with claws and fangs -- Aliens! The hungry brutal aliens begin to feast on the Ninja warriors, leaving only a few survivors. The leader Yamata vows vengeance for their comrades' deaths, risking their lives to challenge the aliens. None of their Ninja weapons, neither the swords nor the throwing stars, have any affect on the aliens. Now, the Iga Ninja faces his biggest challenge ever!
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