Boris Karloff (Dr. Hohner)
Susanna Foster (Angela)
Turhan Bey (Franz)
Gale Sondergaard (Luise)
Thomas Gomez (Count Seebruck)
Erno Verebes (Brunn)
Lotte Stein (Mama Hinzl)
Scotty Beckett (King)
William Edmunds (Leon)
Dorothy Lawrence (Mrs. Metzger)
June Vincent (Marcellina)
George Dolenz (Amato Roselli)
Ludwig Stossel (Carl Bauman)
Jane Farrar (Jarmilla Vadek)