Dick Tracy Contra o Monstro

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)