In 1880, Sir Robert Cargrave, a London physician known for his experimental work in paralysis treatment, is summoned to Gorslava by the mysterious Baron Sardonicus—who is now married to Cargrave's former wife, Maude—to treat his disfigurement. When Cargrave arrives, he finds the masked baron is a cruel sadist who has threatened to harm Maude if he is not successfully cured.

Ronald Lewis
as Sir Robert Cargrave

Audrey Dalton
as Maude Sardonicus

Guy Rolfe
as Baron Sardonicus

Oskar Homolka
as Krull

Vladimir Sokoloff
as Henryk Toleslawski

Erika Peters
as Elenka

Lorna Hanson
as Anna

Constance Cavendish
as Mrs. Higgins (uncredited)

James Forrest
as Geoffery Wainwright (uncredited)

Tina Woodward
as The Girl (uncredited)