![The Mysterious Mr. M](https://image.tmdb.org/t/p/original//c7ENJPMphcbNWHz1LLuEHMscJcH.jpg)
![The Mysterious Mr. M](https://image.tmdb.org/t/p/w200//a620dqtrkiP7qvNpM3tKj9BheiO.jpg)
The Mysterious Mr. M
3 hours 47 minutes1946-07-23
3.8
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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.
Cast
![Edmund MacDonald](https://image.tmdb.org/t/p/w200//trqvaWYKAer2wlpOqJPXZlsMqpA.jpg)
Edmund MacDonald
Anthony Waldron
![Pamela Blake](https://image.tmdb.org/t/p/w200//daJiet6yNySXEzECRx9moNeMnMz.jpg)
Pamela Blake
Shirley Clinton
![Danny Morton](https://image.tmdb.org/t/p/w200//b7Zc5UoOGmvbjbFhgJ2121CBa8b.jpg)
Danny Morton
Derek Lamont
![Virginia Brissac](https://image.tmdb.org/t/p/w200//plkkPOoTu5qc6i1K9wRJXyoUgq2.jpg)
Virginia Brissac
Cornelia Waldron
![Joseph Crehan](https://image.tmdb.org/t/p/w200//vhTx27RLuFTR0K5DeL1UHeZIvRg.jpg)
Joseph Crehan
Dan Blair
![Jack Ingram](https://image.tmdb.org/t/p/w200//kspyAwF8bw1FFEzYaERCtfkBHSZ.jpg)
Jack Ingram
William Shrag
![Dennis Moore](https://image.tmdb.org/t/p/w200//l0ASkx4SxvHRGAJNLZsj1zkpg9V.jpg)
Dennis Moore
Agent Grant Farrell
![Richard Martin](https://image.tmdb.org/t/p/w200//cd2B3ZYgqsWfOWZPIKqDXp4QpnK.jpg)
Richard Martin
Detective Lt. Kirby Walsh
![Byron Foulger](https://image.tmdb.org/t/p/w200//8j1Mn3alrcZyfe742LCfjCglQ3L.jpg)
Byron Foulger
Wetherby
![Jane Randolph](https://image.tmdb.org/t/p/w200//4KcOWHaHZnHrq4Y7s1ScZiG7obn.jpg)
Jane Randolph
Marina Lamont
![William Ching](https://image.tmdb.org/t/p/w200//noGb3EWltYBssnHFmpGbflokgsi.jpg)
William Ching
Jim Farrell
![Joe Haworth](https://image.tmdb.org/t/p/w200//p1khkDcEnfAxJebs3G8efnHUJVN.jpg)
Joe Haworth
Donninger
![Patricia Alphin](/_next/static/media/notFound.aecd17f8.png)