(1961)
Directed by William Castle
Starring Guy Rolfe, Ronald Lewis, Oscar Homolka, Audrey Dalton, Vladimir Sokoloff, Erika Peters.

The groundbreaking doctor Sir Robert, specializing in muscle maladies, receives a strange message from an old love, asking him to come to her home in a distant land for some dire help. Once he arrives there, he meets the husband of his long-lost love, the Baron Sardonicus. Sardonicus had acquired his wife after paying off the gambling debt of her father. But the strange part of Sardonicus is that his face is hidden behind a mask. He tells his story of how he acquired his wealth, and the terrible secret he is hiding behind the mask. He blackmails Sir Robert into curing his affliction or his wife will come to great harm.