The Mysterious Mr. M (1946)
3h 47m
Running Time
July 23, 1946Release Date
Plot.
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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Wiki.
The Mysterious Mr. M is a 1946 Universal Pictures movie serial, the 137th and last serial produced by Universal.