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)