Two CIA agents, a kung fu master and a suave womanizer, track the stolen formula for a super-sterility drug from Spain to Hong Kong, battling Neo-Nazi terrorists and a Vietnamese spy ring for its possession.

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Ninja Over the Great Wall takes place in the early nineteen-thirties when China was occupied by the Japanese imperial forces. Wa Chi Keung is a peasant who escaped the mass murder of his village by the Japanese. He joins his master in Bejing shortly before the old man's assassination by ninjas.