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)

Phil Arnold

Sneezing Bank Customer (uncredited)

Walter Bacon

Bar Patron (uncredited)

Lex Barker

City Hospital Driver (uncredited)

Eddie Borden

Bank Customer (uncredited)

Robert Bray

Sergeant (uncredited)

Robert Clarke

Fred (Police Analyst) (uncredited)

George Cooper

Stone (Bank Teller) (uncredited)

Suzi Crandall

Blonde Bank Customer (uncredited)

William Gould

Pop (uncredited)

Ben Hall

Luke (Police Stooge) (uncredited)

Harry Harvey

Humphrey (Bank Guard) (uncredited)

Tom Keene

Dr. Frankey (uncredited)

George Lloyd

Owner of the Hangman's Knot (uncredited)

Robert Malcolm

Doctor (uncredited)

Sean McClory

Officer Carney (uncredited)

Lew Meehan

Police Driver in Montage (uncredited)

Bruce Mitchell

Police Sgt. in Montage (uncredited)

Lee Phelps

Detective (uncredited)

Lorin Raker

Insolvent Borrower (uncredited)

Bert Roach

Crandall (uncredited)

Jason Robards Sr.

Bank Officer (uncredited)

Harry Strang

Tim (uncredited)

Tex Swan

Policeman (uncredited)