Edward G. Robinson as Professor Richard Wanley

Joan Bennett as Alice Reed

Raymond Massey as Dist. Attorney Frank Lalor

Edmund Breon as Dr. Michael Barkstane

Dan Duryea as Heidt / Tim, the Doorman

Thomas E. Jackson as Inspector Jackson

Dorothy Peterson as Mrs. Wanley

Robert Blake as Dickie Wanley

Arthur Loft as Claude Mazard / Frank Howard / Charlie the Hatcheck Man

Frank Dawson as Collins, the Steward

Iris Adrian as Streetwalker (uncredited)

Brandon Beach as Man at Club (uncredited)

Paul Bradley as Man at Club (uncredited)

Don Brodie as Onlooker at Gallery (uncredited)

Claire Carleton as Blonde (uncredited)

James Carlisle as Man at Club (uncredited)

Eddy Chandler as Police Driver (uncredited)

Freddie Chapman as Boy with Mother (uncredited)

Tom Dillon as Police Officer Dillon (uncredited)

Alec Craig as Garage Man (uncredited)

Hal Craig as News Vendor (uncredited)

Joe Devlin as Toll Collector on Henry Hudson Parkway (uncredited)

Ralph Dunn as Traffic Cop (uncredited)

Bess Flowers as Bar Patron (uncredited)

Jack Gardner as Fred, the District Attorney's Chauffeur (uncredited)

Jack Gargan as Club Steward (uncredited)

James Harrison as Club Steward (uncredited)

Fred Graham as Motorcycle Cop (uncredited)

Tom Hanlon as Radio Announcer (uncredited)

Harry Hayden as Pharmacist (uncredited)

Fred Hueston as Man at Club (uncredited)

Sheldon Jett as Man at Club (uncredited)

Jack W. Johnston as Man at Club (uncredited)

Donald Kerr as First Elevator Operator (uncredited)

Anne Loos as Stenographer (uncredited)

George McFarland as Boy Scout (uncredited)

Frank McLure as Elevator Operator (uncredited)

Charles Meakin as Man at Club (uncredited)

Frank Melton as Onlooker at Gallery (uncredited)

Frank Mills as Charlie the Garage Helper (uncredited)

Harold Minjir as Man at Club (uncredited)

Frances Morris as Stenographer (uncredited)

Wedgwood Nowell as Man at Club (uncredited)

Anne O'Neal as Mother by Elevator (uncredited)

Louis Payne as Man at Club (uncredited)

Dave Pepper as Club Member (uncredited)

Fred Rapport as Club Manager (uncredited)

Alexander Pollard as William the Headwaiter (uncredited)

Scott Seaton as Man at Club (uncredited)

Arthur Space as Captain Kennedy (uncredited)

Wyndham Standing as Man at Club (uncredited)

Larry Steers as Man at Club (uncredited)