El sorprendente Dr. Clitterhouse

Edward G. Robinson

Dr. T.S. Clitterhouse

Claire Trevor

Jo Keller

Humphrey Bogart

'Rocks' Valentine

Allen Jenkins

Okay

Donald Crisp

Police Inspector Lewis Lane

Gale Page

Nurse Randolph

Henry O'Neill

Judge

John Litel

Mr. Monroe, Prosecuting Attorney

Thurston Hall

Grant

Ward Bond

Tug

Ronald Reagan

Radio Announcer (voice) (uncredited)

Mary Field

Millie - Mrs. Updyke's Maid (uncredited)

Maxie Rosenbloom

Butch

Vladimir Sokoloff

Popus

Bert Hanlon

Pat

Curt Bois

Rabbit

Billy Wayne

Candy

Robert Homans

Lt. Johnson

Irving Bacon

Foreman of Jury

John Alban

Guest (uncredited)