An evil scientist known as "Mr. M." uses a drug he has developed called "hypnotreme" to help steal submarine equipment. Federal agent Grant Farrell is dispatched to find the mysterious villain and stop his nefarious plans.
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The Mysterious Mr. M (1946) is a action movie. Starring Edmund MacDonald, Pamela Blake, Danny Morton. Rated 5.2/10 on TMDB. Watch it online free on ZapFlix.