William Powell

Dr. Lawrence 'Brad' Bradford

Jean Arthur

Paula Bradford

James Gleason

Inspector Corrigan

Eric Blore

Stokes, Bradford's Butler

Robert Armstrong

Nick Martel, Bookie

Lila Lee

Miss Prentiss, Bradford's Receptionist

Grant Mitchell

John Summers, Luxury's Owner

Erin O'Brien-Moore

Mrs. Summers

Ralph Morgan

Leroy Hutchins, War Cloud's Owner

Lucile Gleason

Mrs. Hutchins

Johnny Arthur

Mr. Frankenstein (uncredited)

Stanley Blystone

Police Radio Operator (uncredited)

Spencer Charters

Dr. Bunting (uncredited)

Frankie Darro

Spike Salisbury (uncredited)

John Dilson

Analyst Examining Gelatin Capsule (uncredited)

James Donlan

Taxi Driver (uncredited)

Paul Fix

Lou Pender (uncredited)

Dorothy Granger

Fill-in Receptionist (uncredited)

Sam Hayes

Race Announcer (uncredited)

Rollo Lloyd

Landlord (uncredited)

Edward McWade

Minister in Film (uncredited)

Frank Reicher

Henry Strand (uncredited)

Charles Richman

Mr. Curtis (uncredited)

Syd Saylor

Detective (uncredited)

John Sheehan

Bert Murphy (uncredited)

Buster Slaven

Newsboy (uncredited)

Al St. John

Morgue Attendant (uncredited)

Frank M. Thomas

Mike North (uncredited)