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In page The Castle of Cagliostro:

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The film's Japanese theatrical release was on 15 December 1979.[1] A year later, Tokyo Movie Shinsha began screen testing the film in North America and it was notably shown at the World Science Fiction Convention in Boston for a marketing survey. It was later screened at other festivals during the 1980s, including FILMEX 82 in Los Angeles.[2] Despite resounding acclaim from the screenings, many of them were unsuccessful. According to Fred Patten, the primary reason was that, "most people did not bother to come to it since it was "only" an animated-cartoon feature, not a "serious" live-action movie."[3] A 4K UHD version by VAP is slated for release on July 24, 2019.[4]