Distribution principale
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)
