"A mad doctor is determined to take revenge on the family he believes is responsible for his daughter's death."
Warner Oland
as Dr. Boris Karlov
June Collyer
as Kitty Conover
Lloyd Hughes
as Prince Nicholas Petroff
Clara Blandick
as Aunt Abbie
Hale Hamilton
as Martin Kent
Wallace MacDonald
as Prince Gregor Petroff
George Fawcett
as General Petroff
Florence Lake
as Anya Karlov
Mischa Auer
as Peter
Ernest Hilliard
as Prince Ivan Petroff
George B. Seitz
Director
Corson Jowett
Sound
Harold McGrath
Story
Florence Ryerson
Dialogue
Phil Goldstone
Producer
Fay Babcock
Art Direction
Continuity
Arthur Reed
Director of Photography
Ralph M. DeLacy
Settings
Otto Ludwig
Editor
