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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Cast

Complete credited cast:
...
Agent Grant Farrell
...
Shirley Clinton
Richard Martin ...
Detective Lieutenant Kirby Walsh
...
Marina Lamont
Danny Morton ...
Derek Lamont
Edmund MacDonald ...
Anthony Waldron
...
William Shrag
Joe Haworth ...
Donninger
...
Wetherby / Mr. M
Joseph Crehan ...
Police Chief Dan Blair
...
Jim Farrell [Chs. 1-3] (as William Brooks)
Virginia Brissac ...
Cornelia Waldron
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Storyline

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.

Plot Summary | Add Synopsis

Taglines:

1000 startling adventures! 1000 weird sensations!

Genres:

Adventure

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Details

Country:

Language:

Release Date:

23 July 1946 (USA)  »

Also Known As:

O Misterioso Mr. M  »

Company Credits

Production Co:

 »
Show detailed on  »

Technical Specs

Runtime:

Sound Mix:

Aspect Ratio:

1.37 : 1
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Did You Know?

Trivia

This was Universal Pictures' last theatrical serial. Three additional serials were canceled while still in the planning stages: The Yukon Sky Patrol, The Scarlet Horseman Rides Again, and The Evil Eye. See more »

Quotes

Agent Grant Farrell: Mr. M is making it harder to get a slab in the morgue than a room in the hotel.
Derek Lamont: The papers are calling him the Mysterious Mr. M now.
Agent Grant Farrell: Yeah, by letting us know it's our job to take the mystery out of it.
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