Dr. Lawrence 'Brad' Bradford
William Powell
Paula Bradford
Jean Arthur
Inspector Corrigan
James Gleason
Stokes
Eric Blore
Nick Martel
Robert Armstrong
Miss Prentiss
Lila Lee
Mr. John Summers
Grant Mitchell
Mrs. Summers
Erin O'Brien-Moore
Mr. Leroy Hutchins
Ralph Morgan
Mrs. Hutchins
Lucile Gleason
Mike North (uncredited)
Frank M. Thomas
Mr. Frankenstein (uncredited)
Johnny Arthur
Henry Strand (uncredited)
Frank Reicher
Police Radio Operator (uncredited)
Stanley Blystone
Mr. Curtis Turf Club President
Charles Richman
Police Sergeant (uncredited)
Tom Brower
Murphy
John Sheehan
Dr. Bunting (uncredited)
Spencer Charters
Spike Salisbury (uncredited)
Frankie Darro
Lou Pender (uncredited)
Paul Fix
Analyst Examining Gelatin Capsule (uncredited)
John Dilson
Taxi Driver (uncredited)
James Donlan
Fill-in Receptionist (uncredited)
Dorothy Granger
Race Announcer (uncredited)
Sam Hayes
Detective (uncredited)
Syd Saylor
Landlord
Rollo Lloyd
Landlord (uncredited)
Rollo Lloyd
Cop
Charles McMurphy
Minister in Film (uncredited)
Edward McWade
Bert Murphy (uncredited)
John Sheehan
Mr. Frankenstein
Jack Rice
Newsboy (uncredited)
Buster Slaven
Morgue Attendant (uncredited)
Al St. John
Mrs. Hutchins
Lucille Gleason
Ray Torro (uncredited)
Henry Stone
Joe Jerino (uncredited)
Bob Tansill