Boris Karloff

Dr. Friedrich Hohner

Susanna Foster

Angela Klatt

Turhan Bey

Franz Munzer

Gale Sondergaard

Luise

Thomas Gomez

Count Seebruck

June Vincent

Marcellina

George Dolenz

Amato Roselli

Ludwig Stössel

Carl Baumann

Jane Farrar

Jarmila Vadek

Ernö Verebes

Brunn

Lotte Stein

Mama Hinzl

Scotty Beckett

The King

William Edmunds

Leon, Theatre Concierge

Maxwell Hayes

Count Romburg

Dorothy Lawrence

Miss Metzger

Bella Lewitzky

Dancer (Uncredited)

Jack Richardson

Musical Conductor (Uncredited)

Polly Bailey

Cleaning Woman (Uncredited)

Stuart Holmes

King's Consul (Uncredited)

Eddie Polo

Stagehand (Uncredited)

Paul Power

Reporter (Uncredited)

Ernie Adams

Man in Audience Next to Franz (Uncredited)

Gertrude Astor

Woman in Audience Behind Franz (Uncredited)

Grace Cunard

Backstage Maid (Uncredited)

William Desmond

Backstage Technician (Uncredited)

Francis Ford

Backstage Attendant (Uncredited)

Louis Payne

Audience Member (Uncredited)

Anne Cornwall

Audience Member (Uncredited)

Rudy Bowman

Audience Member (Uncredited)

William H. O'Brien

Audience Member (Uncredited)

Helen Gibson

Audience Member (Uncredited)

Maurice Costello

Audience Member (Uncredited)

Harry Mayo

Audience Member (Uncredited)

Richard Neill

Audience Member (Uncredited)

Eric Mayne

Audience Member (Uncredited)

Barry Regan

Audience Member (Uncredited)