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.
Boris Karloff
Ralph Byrd
Anne Gwynne
Edward Ashley
June Clayworth
Lyle Latell
Tony Barrett
Skelton Knaggs
James Nolan
Joseph Crehan
Milton Parsons
Ernie Adams
Phil Arnold
Walter Bacon
Lex Barker
Eddie Borden
Robert Bray
Robert Clarke
George Cooper
Suzi Crandall
William Gould
Ben Hall
Harry Harvey
Tom Keene
George Lloyd
Robert Malcolm
Sean McClory
Lew Meehan
Bruce Mitchell
Lee Phelps
Lorin Raker
Bert Roach
Jason Robards Sr.
Harry Strang
Tex Swan