Enter the Ninja began life as a low‑budget passion project spearheaded by karate champion Mike Stone with director Emmett Alston attached. In late fall 1980 Menahem Golan of Cannon Films — who had come on board to shepherd the film as part of a multi‑picture arrangement with MGM — intervened and effectively reshaped the production. Principal photography officially began January 12, 1981, and when shooting moved to Manila in February Golan replaced Alston as director and also supplanted Stone in the lead role with Italian star Franco Nero. Rather than leaving the production entirely, both displaced creatives were retained in diminished but crucial capacities: Alston stayed on as second‑unit director and Stone accepted onscreen credit for the story while serving as fight double, fight choreographer and stunt coordinator. The quick mid‑production reassignments — executed in roughly a month between Golan's deeper involvement and the Manila shoot — are a textbook example of Cannon’s executive‑driven, commercial approach to filmmaking, where producers routinely overrode original creative plans to boost marketability.
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