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.
The Mysterious Mr. M (1946) is currently not available on any services.
Edmund MacDonald , Pamela Blake , Virginia Brissac , Joseph Crehan , Jack Ingram , Dennis Moore
Lewis D. Collins, Vernon Keays
Universal Pictures