Characters played by Warner Oland
Dr. Boris Karlov
Characters played by June Collyer
Kitty Conover
Characters played by Lloyd Hughes
Prince Nicholas Petroff
Characters played by Clara Blandick
Abbie Krantz
Characters played by Hale Hamilton
Martin Kent
Characters played by Wallace MacDonald
Prince Gregor Petroff
Characters played by George Fawcett
General Petroff
Characters played by Florence Lake
Anya Karlov
Characters played by Mischa Auer
Peter
Characters played by Ernest Hilliard
Prince Ivan Petroff
Characters played by Ann Brody
Taisya
Characters played by Julia Swayne Gordon
Aristocrat at Banquet
Characters played by Ruth Hall
Banquet Guest
Characters played by Robert Homans
Detective
Characters played by Murdock MacQuarrie
Stephen - the Butler
Characters played by Broderick O'Farrell
Dr. Brett
Characters played by Harry Semels
Karlov's Henchman