

A gang of criminals, which includes a piano player and an imposing former convict known as 'Gruesome', has found out about a scientist's secret formula for a gas that temporarily paralyzes anyone who breathes it. When Gruesome accidentally inhales some of the gas and passes out, the police think he is dead and take him to the morgue, where he later revives and escapes. This puzzling incident attracts the interest of Dick Tracy, and when the criminals later use the gas to rob a bank, Tracy realizes that he must devote his entire attention to stopping them.
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Cast

Boris Karloff
Gruesome

Ralph Byrd
Dick Tracy

Anne Gwynne
Tess Trueheart

Edward Ashley
Dr. L.E. Thal

June Clayworth
Dr. I.M. "Irma" Learned

Lyle Latell
Pat Patton

Tony Barrett
Melody

Skelton Knaggs
X-Ray

James Nolan
Dan Sterne

Joseph Crehan
Chief Brandon

Milton Parsons
Dr. A. Tomic

Ernie Adams
Waiter at Hangman's Knot (uncredited)
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