Générique complet
Whispering Smith Speaks
George O'Brien
Gordon Harrington, Jr. aka John 'Whispering' Smith
Irene Ware
Nan Roberts
Kenneth Thomson
J. Wesley Hunt
MA
Maude Allen
Mrs. Roberts
Spencer Charters
Cal Stone
Victor Potel
Bill Prouty
Edward Keane
Rebstock
Frank Sheridan
Gordon Harrington, Sr.
William V. Mong
Blake
Maurice Cass
C. Luddington Colfax
Allan Cavan
Harrington Office Worker (uncredited)
Bess Flowers
Secretary (uncredited)
John Ince
Conductor (uncredited)
Si Jenks
Oiler (uncredited)
J.P. McGowan
Caboose Passenger (uncredited)
DR
Dick Rush
Denver Police Chief (uncredited)