Nick Burton
Lee Tracy
Helen Hewitt
Linda Hayes
Professor
Shemp Howard
Sylvester Odgen 'SOS' Schofield (as Horace MacMahon)
Horace McMahon
Warden Tom Hammond
Thomas E. Jackson
Tony Brody
Elliott Sullivan
Dr. Harry Lindsay
Selmer Jackson
'Windy' Windsor (as Jack Arnold)
Vinton Hayworth
Reporter (uncredited)
Brooks Benedict
Deputy Taking Collins to Prison (uncredited)
Leo Cleary
Guard Finding Keats' Menu (uncredited)
Richard Cramer
Mike, a Reporter (uncredited)
Hal K. Dawson
Bruce Vander
Raymond Walburn
Vince Connell (uncredited)
Joe Devlin
Observer at Train Station (uncredited)
John Dilson
Cockney Convict Heckler (uncredited)
Charlie Hall
Jerry Connell (uncredited)
Kenneth Harlan
Eddie Hart
Dell, Deputy Taking Vander to Prison (uncredited)
Dell Henderson
Prison Library Clerk (uncredited)
Donald Kerr
Guard (uncredited)
Roger Laswell
Marie Brody (uncredited)
Grace Lenard
Convict (uncredited)
Sam Lufkin
James Brent
Morgan Conway
Guard in Yard (uncredited)
George Magrill
Convict Taunting New Prisoners (uncredited)
Herman Marks
Visitor's Room Guard (uncredited)
Larry McGrath
Donald McNamee
Convict Chef Dominick (uncredited)
Frank Mills
Train Conductor (uncredited)
Bruce Mitchell
Frank, Prison Guard (uncredited)
Frank O'Connor
Red Vernon (uncredited)
Cy Schindell
Deputy Taking Keats & Kellogg to Prison (uncredited)
John Sheehan
Mess Hall Guard (uncredited)
Sammy Stein
Dr. William 'Bill' Collins
Truman Bradley
Harry Strang
Jock, Vander's Nephew (uncredited)
Grady Sutton
Chester Tallman
Max, Convict (uncredited)
Anthony Warde
Wife of SOS (uncredited)
Carole Wayne
R.J. Reynolds, Sunday Editor (uncredited)
Charles C. Wilson
May Thomas
Virginia Vale
Happy
Cliff Edwards
Ox
Paul Guilfoyle
Harold Kellogg
Thurston Hall
Sidney Keats
Chester Clute
Special Effects
Vernon L. Walker
Original Music Composer
Roy Webb
Art Direction
Van Nest Polglase
Costume Supervisor
Renié
Screenplay
Lynn Root
Story
Martin Mooney
Editor
Theron Warth
Frank Fenton
Producer
Howard Benedict
Director
Ray McCarey
Director of Photography
Harry J. Wild
Sound Recordist
Richard Van Hessen
Executive Producer
Lee S. Marcus