Boris Karloff
Role: Dr. Friedrich Hohner
Susanna Foster
Role: Angela Klatt
Turhan Bey
Role: Franz Munzer
Gale Sondergaard
Role: Luise
Thomas Gomez
Role: Count Seebruck
June Vincent
Role: Marcellina
George Dolenz
Role: Amato Roselli
Ludwig Stössel
Role: Carl Baumann
Jane Farrar
Role: Jarmila Vadek
Lotte Stein
Role: Mama Hinzl
Scotty Beckett
Role: The King
William Edmunds
Role: Leon, Theatre Concierge
Maxwell Hayes
Role: Count Romburg
Dorothy Lawrence
Role: Miss Metzger
Bella Lewitzky
Role: Dancer (Uncredited)
Jack Richardson
Role: Musical Conductor (Uncredited)
Polly Bailey
Role: Cleaning Woman (Uncredited)
Stuart Holmes
Role: King's Consul (Uncredited)
Eddie Polo
Role: Stagehand (Uncredited)
Paul Power
Role: Reporter (Uncredited)
Ernie Adams
Role: Man in Audience Next to Franz (Uncredited)
Gertrude Astor
Role: Woman in Audience Behind Franz (Uncredited)
Grace Cunard
Role: Backstage Maid (Uncredited)
William Desmond
Role: Backstage Technician (Uncredited)
Francis Ford
Role: Backstage Attendant (Uncredited)
Louis Payne
Role: Audience Member (Uncredited)
Anne Cornwall
Role: Audience Member (Uncredited)
Rudy Bowman
Role: Audience Member (Uncredited)
William H. O'Brien
Role: Audience Member (Uncredited)
Helen Gibson
Role: Audience Member (Uncredited)
Maurice Costello
Role: Audience Member (Uncredited)
Harry Mayo
Role: Audience Member (Uncredited)
Richard Neill
Role: Audience Member (Uncredited)
Eric Mayne
Role: Audience Member (Uncredited)
Barry Regan
Role: Audience Member (Uncredited)